Photonic Quantum Computing: PsiQuantum & Xanadu Room-Temperature Systems
Photonic quantum computing news: PsiQuantum, Xanadu quantum photonics. Room-temperature operation, cluster states & quantum networking advances.
Photonic quantum computing encodes quantum information in light—using photon polarization, path, or time-bin degrees of freedom—to perform computation at room temperature without cryogenic infrastructure. This approach promises seamless integration with existing fiber-optic telecommunications networks.
Two Dominant Architectures
Two dominant architectures drive commercial development: cluster state/MBQC (Measurement-Based Quantum Computing) used by PsiQuantum, and Gaussian Boson Sampling/SGBSV employed by Xanadu's Borealis and X-series photonic processors.
India's Photonic Quantum Research
India's National Quantum Mission explicitly includes photonic technology as a priority platform. The Quantum Computing Thematic Hub at IISc Bengaluru targets development of quantum computing chips based on superconducting, photonic, and spin qubits according to official DST announcements. The Quantum Communication Thematic Hub at IIT Madras, established as the IITM C-DOT Samgnya Technologies Foundation, focuses on photonic quantum technologies including quantum key distribution and satellite-based quantum communication.
Key Advantages
Key advantages include room-temperature operation eliminating dilution refrigerators, natural compatibility with fiber-optic quantum networks, high-speed gate operations (picoseconds), and mature semiconductor fabrication for silicon photonics integration. Current challenges include probabilistic photon sources and detectors introducing overhead, photon loss in optical components, and massive qubit counts needed for fault tolerance.
Recent Breakthroughs
Recent breakthroughs include Xanadu's Borealis demonstrating quantum computational advantage using Gaussian boson sampling with 216 squeezed light modes, and PsiQuantum releasing detailed architecture plans for utility-scale quantum computing using thousands of modular chips.
quantum-computingOratomic raises $300M to build a viable quantum computer that needs only 20K qubits
A number of companies, betting on various architectural approaches, are trying to build the first commercially viable quantum computer capable of significantly outperforming current systems. Oratomic, which entered the race earlier this year with the goal of developing the first utility-scale quantum computer by the end of the decade, said this week that it has raised $300 million. The massive Series A round was co-led by ARCH Venture Partners, Spark Capital, and Khosla Ventures, with participation from Bezos Expeditions, Index Ventures, General Catalyst, Lowercarbon Capital, Bain Capital, and others. Founded by Caltech physicists, Oratomic uses lasers, which act as optical tweezers, to hold individual atoms in place as the basis for its quantum computer. The startup was launched after its researchers discovered that their approach can correct errors using significantly fewer qubits — the basic unit in quantum computing — than previously thought possible. Since quantum computers are sensitive to noise, effective error correction is the key to turning them into truly useful tools. “You would have not previously been able to convince any of us to start a quantum computing company, because we just thought it was way too far away,” Oratomic’s co-founder and CEO Dolev Bluvstein told TechCrunch. “Only when we made this recent breakthrough did we simultaneously all change our minds.” While most other quantum companies are making prototypes available to research scientists and corporations, Oratomic has no plans to develop or sell these systems, known as noisy intermediate-scale quantum, or NISQ. Bluvstein noted that Oratomic shouldn’t be compared to PsiQuantum, a startup valued at $7 billion last September, which is also bypassing the NISQ stage and aims to deliver a viable, million-qubit quantum computer by the end of next year. Oratomic’s approach is fundamentally simpler and less expensive, Bluvstein argued. “The difference is that we need roughly 10,000 to 20,000 qubit
TechCrunchLoading...0
quantum-computingQuantum Sensing Intelligence Completes Beefy Angel Round to Deploy Photonic Quantum Sensors in Inertial Navigation, Gas Monitoring
Quantum Sensing Intelligence has completed an angel round of tens of millions of yuan led by Futeng Capital. The Shanghai startup, incubated at Shanghai Jiao Tong University, is commercializing photonic quantum enhancement for sensors. A miniature photonic quantum gyroscope reached navigation precision in tests, and a quantum gas detector earned CNAS certification for power grid use. Early orders and revenue confirm market demand, with funding set to expand production and R&D. The post Quantum Sensing Intelligence Completes Beefy Angel Round to Deploy Photonic Quantum Sensors in Inertial Navigation, Gas Monitoring appeared first on The Qubit Report.
The Qubit ReportLoading...0
quantum-computingShanghai Quantum Sensing Intelligence Completes Angel Funding Round
Shanghai Quantum Sensing Intelligence Technology Co., Ltd. has secured tens of millions of yuan in angel funding led by Futeng Capital, indicating strong early-stage investment in the developing field of quantum sensing. Founded in September 2023 and incubated by researchers at Shanghai Jiao Tong University, the company exceeded 10 million yuan in revenue last year while deploying products in inertial navigation and gas monitoring, aiming to address domestic market gaps and compete with foreign dominance in these sectors. The team’s core technology centers on self-developed photonic quantum enhancement, resulting in a product system encompassing quantum inertial navigation and gas monitoring equipment. The founder of Quantum Sensing Intelligence is one of the earliest domestic scholars engaged in quantum information technology research in the 1990s, currently serving as a tenured professor and doctoral supervisor at Shanghai Jiao Tong University, and a Humboldt Scholar of Germany. SDIC Shanghai Backs Quantum Sensing Intelligence Launch Led by Futeng Capital, an arm of Shanghai State Investment, and with participation from Liuhe Venture Capital, the financing will accelerate development and deployment of sensors targeting inertial navigation and gas monitoring applications. Founded in September 2023, the company’s rapid progression from inception to securing investment and exceeding 10 million yuan in revenue last year demonstrates a fast timeline common in emerging quantum technology ventures. The core of Quantum Sensing Intelligence’s approach lies in self-developed photonic quantum enhancement technology. This academic foundation is not merely theoretical; the team emphasizes a strategy of “mechanism exploration, technical research, and prototype development” to ensure rapid commercialization. Currently in small-batch trial production with a small number of orders already delivered to power grid companies and aerospace research institutes, Quantum Sensing Intellig
Quantum ZeitgeistLoading...0
quantum-computingShanghai Quantum Sensing Intelligence Secures Tens of Millions of Yuan in Angel Round to Scale Photonic Sensing Infrastructure
Shanghai Quantum Sensing Intelligence Secures Tens of Millions of Yuan in Angel Round to Scale Photonic Sensing Infrastructure Deep-tech hardware developer Shanghai Quantum Sensing Intelligence Technology Co., Ltd. has completed an angel round of financing, securing tens of millions of yuan. The capitalization round was led by Futeng Capital (a specialized investment vehicle operating under the sovereign Shanghai State Investment banner), with co-investment from Liuhe Venture Capital. Established in September 2023 as an industrial spin-out incubated by members of the Quantum Sensing Research Institute at Shanghai Jiao Tong University (SJTU), the firm focuses on the commercialization of room-temperature quantum precision measurement devices. The capital injection accelerates small-batch trial production lines, team extensions, and the deployment of microfabrication modules across aerospace, military, and energy infrastructure markets. [ Quantum Sensing Intelligence Architecture ] Financial Injection ──► Tens of millions of yuan in Angel Funding led by Futeng Capital. Core Technology ──► Room-temperature Photonic Quantum Enhancement Module platforms. Operational Markets ──► Navigation-grade inertial gyroscopes and trace power grid gas monitoring. Strategic Roadmap ──► Integrating quantum precision sensing with Edge Quantum AI computing. Photonic Quantum Enhancement Mechanics The technological framework developed by the co-founding team addresses an engineering limitation in classical precision instruments: the high signal-to-noise ratio (SNR) degradation that occurs when trying to isolate ultra-weak physical indicators from background system noise. Rather than shifting to cryogenic control mechanisms or large vacuum enclosures that limit field transportability, the company employs a proprietary photonic quantum enhancement technology that operates continuously at room temperature. This approach integrates a quantum enhancement layer directly into existing classical op
Quantum Computing ReportLoading...0
quantum-computingRobust Ion-Photon Entanglement via Polarization-to-Time-Bin Conversion
--> Quantum Physics arXiv:2607.07805 (quant-ph) [Submitted on 8 Jul 2026] Title:Robust Ion-Photon Entanglement via Polarization-to-Time-Bin Conversion Authors:Ana Luiza Ferrari, Denton Wu, Mika A. Zalewski, Norbert M. Linke View a PDF of the paper titled Robust Ion-Photon Entanglement via Polarization-to-Time-Bin Conversion, by Ana Luiza Ferrari and 2 other authors View PDF HTML (experimental) Abstract:Time-bin photonic qubits are well-suited for quantum network applications due to their robustness to polarization instability in fiber links and potential for heterogeneous networks. In this work, we implement the first entanglement-preserving polarization-to-time-bin conversion of a photon qubit in an entangled state with a matter qubit. Photons initially generated with polarization encoding are converted to the time-bin basis through a polarization-discriminating asymmetric Mach-Zehnder interferometer. The photonic qubits are generated via the $1092$ nm transition of a $^{88}$Sr$^{+}$ ion. We measure state fidelity bounds of $0.906 \pm 0.011 \le \mathcal{F} \le 0.934\pm 0.011$, with conversion error $< 0.028$, and find this fidelity is unaffected by depolarizing noise even at full depolarization strength. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2607.07805 [quant-ph] (or arXiv:2607.07805v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2607.07805 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Ana Luiza Ferrari [view email] [v1] Wed, 8 Jul 2026 18:00:05 UTC (1,758 KB) Full-text links: Access Paper: View a PDF of the paper titled Robust Ion-Photon Entanglement via Polarization-to-Time-Bin Conversion, by Ana Luiza Ferrari and 2 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev | next > new | recent | 2026-07 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export Bib
arXiv Quantum PhysicsLoading...0
quantum-computingDahlem Center for Co Team Models Stellar Rank Protocol for Squeezed State Generation
Scientists have conducted a thorough analysis of photon catalysis to generate squeezed coherent state superpositions, resources crucial for advancing quantum computing and error correction in optical systems. Julian K. Nauth at Freie Universitat Berlin and colleagues from Humboldt-Universitat zu Berlin detail how this technique, utilising interactions between light states, allows assessment of the non-Gaussian characteristics of both initial resources and resulting states, enabling a strong evaluation of protocol efficiency. By identifying scenarios where catalysis achieves provably optimal fidelity, and benchmarking against alternative approaches, the analysis provides practical insights into resource trade-offs and resilience against experimental imperfections, ultimately guiding the development of near-term photonic quantum technologies. High fidelity quantum state superpositions realised through optimised photon catalysis A fidelity of 0.98 in generating squeezed coherent state superpositions via photon catalysis has been achieved, representing a substantial improvement over previous methods limited to 0.75. Scientists at Dahlem Centre for Co and Science and Technology Graduate University employed photon catalysis, a hybrid technique combining low number Fock states, discrete packets of light containing a defined number of photons, and squeezed states, to create these complex quantum states. Squeezed states are non-classical states of light where the quantum uncertainty is redistributed between the amplitude and phase quadratures, reducing noise in one quadrature at the expense of increased noise in the other. This reduction in noise is vital for enhancing the sensitivity of quantum measurements and improving the performance of quantum information processing. The generation of these states typically relies on non-linear optical processes, requiring precise phase matching and efficient conversion of photons. Analysis using stellar rank formalism, a mathematical t
Quantum ZeitgeistLoading...0
quantum-computingXanadu Establishes New York Operations Hub to Expand Photonic Hardware Manufacturing Footprint
Xanadu Establishes New York Operations Hub to Expand Photonic Hardware Manufacturing Footprint Publicly traded photonic quantum computing frontrunner Xanadu Quantum Technologies Limited (NASDAQ/TSX: XNDU) has announced a major geographic expansion of its U.S. commercial operations with the opening of a dedicated office in Albany, New York. The strategic placement positions the Toronto-headquartered company within Upstate New York’s advanced semiconductor research and packaging corridor. This expansion reflects an broader U.S. recruitment drive across 19 states—including an active design cluster in the San Francisco Bay Area—resulting in a five-fold increase in the company’s domestic hardware and engineering workforce since 2023. [ Xanadu U.S. Expansion Matrix ] Regional Anchor ──► Albany, New York (Co-located within semiconductor packaging hub). Capital Foundation ──► Backed by over $500 Million USD in private and public market funding. Hardware Vector ──► Room-temperature fault-tolerant photonic quantum processors. Supply Chain Links ──► Production agreements with Corning, Applied Materials, DISCO, and EV Group. The expansion leverages a core technical benefit of the photonic computing modality: the ability to manufacture processing chips directly inside existing, high-volume commercial semiconductor foundries. Unlike competing superconducting loops or trapped-ion systems that require sub-Kelvin dilution refrigerators or vacuum chambers to maintain basic qubit stability, Xanadu’s architecture utilizes light pulses to perform quantum gate operations at room temperature. By embedding its design teams within the Albany semiconductor ecosystem, the firm aims to optimize the mass production of its on-chip Gottesman-Kitaev-Preskill (GKP) qubits—the specialized, error-corrected photonic states required to scale fault-tolerant quantum hardware using industry-standard lithography lines. Led by Founder and CEO Dr. Christian Weedbrook, the company is focusing its expanded wor
Quantum Computing ReportLoading...0
quantum-computingXanadu Accelerates U.S. Growth with New York State Office - Yahoo Finance
This is a paid press release. Contact the press release distributor directly with any inquiries. Xanadu Accelerates U.S. Growth with New York State Office Xanadu Quantum Technologies Limited Thu, July 9, 2026 at 7:00 AM EDT 7 min read XNDU.TO +1.20% XNDU +1.56% TORONTO, July 09, 2026 (GLOBE NEWSWIRE) -- Xanadu Quantum Technologies Limited ("Xanadu"; NASDAQ/TSX: XNDU), a leading photonic quantum computing company, today announced a significant expansion of its U.S. operations, anchored by its growing presence in Albany, New York. Albany has emerged as a hub for global innovation in quantum computing and advanced semiconductor research, positioning it as an ideal strategic base for Xanadu's U.S. expansion. Xanadu has also scaled up operations across the U.S., with growth in the San Francisco Bay Area as well as a distributed presence across the country spanning 19 states. In total, Xanadu's U.S.-based workforce has grown by more than 5-fold since 2023, and Xanadu anticipates its U.S.-based workforce to increase significantly by the end of this year. "The demand for quantum computing has never been higher and our rapid growth in the United States is a testament to the talent and strategic partnerships we have built across the semiconductor and technology industries to help meet those demands," said Dr. Christian Weedbrook, Founder and Chief Executive Officer of Xanadu. "By co-locating with key partners, we are working to ensure rapid response times and close-knit collaboration across teams. We are not just scaling our footprint; we are accelerating the pace of innovation." This expansion is a direct result of Xanadu's commanding technical progress and industrial partnerships. Xanadu's Aurora system established a foundation for future fault-tolerant quantum systems and demonstrated one of the many distinct advantages of a photonic approach to building quantum hardware: modularity and networkability, allowing for seamless integration into existing classical data centers.
Google News – Quantum ComputingLoading...0
quantum-computingEuroHPC JU Funds Six Quantum Computers, Co-funds Two More
Researchers across Europe will gain access to a diverse portfolio of quantum computing technologies starting August 1st, 2026, as the European High Performance Computing Joint Undertaking (EuroHPC JU) opens its quantum infrastructure to experimentation. The initiative provides access to systems including Euro-Q-Exa, Lucy, Piast-Q, and VLQ, representing superconducting qubits, photonic qubits, and trapped-ions, and aims to integrate quantum computers with existing supercomputing capabilities. This “quantum pilot access mode” is designed for users wanting to document the technical feasibility of their applications and develop essential code and algorithms, rather than simply running existing programs. The EuroHPC JU states that this step enables users to experiment with different quantum technologies to advance scientific discovery and drive innovation, with six quantum computers procured and two more co-funded through the HPCQS project, all located within Europe. EuroHPC JU Quantum Access for Testing and Development Europe’s quantum computers are now available for researchers, offering a crucial platform to test and refine emerging applications. This access is not simply about running existing programs on novel hardware, but a deliberate strategy to integrate quantum computers with Europe’s established supercomputing capabilities, enabling quantum-accelerated HPC. The EuroHPC JU’s investment focuses on a diverse portfolio of quantum technologies, including trapped ions, superconducting circuits, photonics, and more, allowing users to evaluate performance across different approaches. The first four quantum computers immediately available through this initiative are Euro-Q-Exa, Lucy, Piast-Q, and VLQ, each utilizing distinct qubit technologies; Euro-Q-Exa and VLQ are based on superconducting qubits, while Lucy employs photonic qubits and Piast-Q utilizes trapped-ions.
Quantum ZeitgeistLoading...0
quantum-computingResourcefulness of non-classical continuous-variable quantum gates
AbstractIn continuous-variable quantum computation, identifying key elements that enable a quantum computational advantage is a long-standing issue. Starting from the standard results on the necessity of Wigner negativity, we develop a comprehensive and versatile approach in which the techniques of $(s)$-ordered quasiprobabilities are exploited to provide rigorous statements on the simulability of photonic quantum circuits consisting of previously characterized gates and thereby identifying the contribution of each quantum gate to the potential achievement of quantum computational advantage. This is achieved by means of an analysis of the so-called transfer function, allowing us to highlight the resourcefulness of a gate set. As such this technique can be straightforwardly applied to current continuous-variables quantum circuits, while also constraining the tolerable amount of losses above which any potential quantum advantage can be ruled out. We use $(s)$-ordered quasiprobability distributions on phase-space to capture the non-classical features in the protocol, and focus our technique entirely on the ordering parameter $s$. This allows us to highlight the resourcefulness and robustness to loss of a universal set of unitary gates comprising three distinct Gaussian gates and any non-Gaussian unitary gate, providing important insight on the role of non-Gaussianity.Featured image: Generic quantum-optical scheme depicted by $M$ input modes, described by a density operator $\rho_{\mathrm{in}}$ processed through a trace-preserving quantum channel $\mathcal{E}$, that can be decomposed into a sequence of trace-preserving quantum channels $\mathcal{E} = \mathcal{E}_1 \circ \mathcal{E}_2 \circ \dots \circ \mathcal{E}_k$. This produces the output state $\rho_{out} = \mathcal{E}(\rho_{in})$ and an output probability distribution $p({x}) = Tr[\rho_{out}\Pi_{{x}}]$ sampled by measuring the POVM $\Pi_{{x}}$.Popular summaryAmong the different platforms being explored for quantum
Quantum Science and Technology (arXiv overlay)Loading...0
quantum-computingHunan Normal University: Researchers Achieve Highly Pure, Indistinguishable Single Photons for Quantum Computing
A new method for generating single photons offers key components for advancing quantum technologies. Ying Ren and colleagues at Hunan Normal University demonstrate a robust scheme for deterministic single-photon emission utilising a three-level atom coupled to a single-mode cavity. The research achieves second-order correlation functions reaching approximately 10-8 under ultrastrong coupling with pulsed driving. Alongside this, photon indistinguishability exceeds $98.73\% and state purities up to 99.99\%. This near-ideal performance represents a step towards overcoming limitations in current single-photon sources and promises to accelerate progress in quantum computing and fundamental quantum optics. Demonstrated high-purity single-photon emission via ultrastrongly coupled atom-cavity systems Purity levels in this new single-photon source have now reached 99.99%, a substantial improvement over previously demonstrated methods. Achieving such high purity and indistinguishability, essential for complex quantum calculations, remained a significant obstacle until recently. Conventional sources, such as spontaneous parametric down-conversion (SPDC) and quantum dots, struggled to consistently produce photons with the required characteristics, often exhibiting multi-photon emission or lacking the necessary control over photon properties. SPDC, while relatively efficient, inherently generates photon pairs, necessitating complex filtering to isolate single photons. Quantum dots, though capable of single-photon emission, suffer from spectral wandering and limited purity. A scheme utilising a three-level atom coupled to a single-mode cavity surpasses these limitations, demonstrating an indistinguishability of 99.10% under ultrastrong coupling, and even higher values with pulsed driving. The cavity confines the light, enhancing the interaction with the atom and increasing the probability of single-photon emission, while the three-level atomic structure allows for precise control
Quantum ZeitgeistLoading...0
quantum-computingInstitut für Physik: Quantum Catalysis: Scientists Detail 3 Key Findings for 2026
Researchers at Humboldt-Universität zu Berlin and Freie Universität Berlin are detailing new findings in quantum catalysis, presenting a method for characterizing the complexity of non-Gaussian quantum states. The team reports employing the stellar rank formalism to measure both the resources needed to create these states and the resulting states themselves, allowing for a systematic comparison of fidelity and optimization of protocols. This work focuses on generating squeezed coherent state superpositions through photon catalysis between low number Fock states and squeezed states, offering a pathway toward more deterministic quantum computing. According to the researchers, “non-Gaussian quantum states and operations constitute essential resources for achieving quantum computational advantage,” and this analysis provides “practical guidelines for near-term photonic implementations.” Finite stellar rank states are robust against approximations with states of lower stellar rank Researchers at Freie Universität Berlin and Humboldt-Universität zu Berlin have demonstrated that finite stellar rank states exhibit a surprising robustness against approximations utilizing states of lower stellar rank, a finding with significant implications for the scalability of photonic quantum computing. This work details the behavior of moving beyond simply creating these states to developing a rigorous method for characterizing their complexity, utilizing the stellar rank formalism to quantify both the input resources and the resulting quantum states. The team’s findings suggest that carefully designed approximations can preserve the essential non-Gaussian characteristics needed for quantum advantage without requiring exponentially increasing resources, a critical step toward practical implementation. The research centers on generating squeezed cat states through a process called photon catalysis, which involves interactions between low number Fock states and squeezed states. This precis
Quantum ZeitgeistLoading...0
quantum-computingPhoton Squeezing and Its Signatures of Quantum Phase Transitions in the Open Quantum Rabi-Stark Model
--> Quantum Physics arXiv:2607.02868 (quant-ph) [Submitted on 3 Jul 2026] Title:Photon Squeezing and Its Signatures of Quantum Phase Transitions in the Open Quantum Rabi-Stark Model Authors:Tian Ye, Xinghan Chen, Chen Wang View a PDF of the paper titled Photon Squeezing and Its Signatures of Quantum Phase Transitions in the Open Quantum Rabi-Stark Model, by Tian Ye and 2 other authors View PDF HTML (experimental) Abstract:As a hallmark of nonclassical light, squeezed light is of profound theoretical interest and holds broad practical promise for emerging quantum technologies. In this work, we investigate steady-state optical quadrature squeezing in the open quantum Rabi-Stark model by employing the quantum dressed master equation. Both numerically and analytically, we find that positive (negative) Stark coupling tends to enhance (suppress) the squeezing effect. The quadrature squeezing exhibits distinct signatures associated with both first- and second-order quantum phase transitions (QPTs). Notably, a sharp vanishing of squeezing is observed across the first-order QPT, suggesting its potential as a sensitive probe of such transitions. In the vicinity of the second-order QPT, we further demonstrate that the squeezing factor displays finite-size scaling behavior, indicating a promising route toward the realization of near-perfect squeezing. Moreover, we establish a quantitative criterion for the disruption of quantum criticality induced by thermal fluctuations, which may offer valuable guidance for future experiments. These findings contribute to a deep understanding of nonclassical light in light-matter interacting systems and provide useful insights for the design of strong optical squeezing states. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2607.02868 [quant-ph] (or arXiv:2607.02868v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2607.02868 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submi
arXiv Quantum PhysicsLoading...0
quantum-computingResearchers Map Quantum Error Correction Using Phase-Space Representations
Scientists at Newcastle University, Enrico Bozzetto and Jonte R. Hance, have developed a structure theorem connecting quasiprobability representations to bosonic quantum error-correcting codes. Bozzetto and colleagues present a general phase-space representation for continuous-variable error-correcting codes, offering insights into how errors manifest within phase space. The mathematical structure of errors is clarified through analyses of Gottesman-Knill-Preskill, cat, and binomial codes, specifically addressing the impact of single photon loss errors. These findings represent a key step towards a sharper understanding and potential improvement of continuous-variable quantum error correction. A unified phase space approach elucidates error behaviour in continuous-variable quantum codes The team at Newcastle University have established a general framework applicable to any bosonic code, improving upon prior methods that required individual derivations for each new code. This represents a shift from custom analyses to a unified approach for understanding error behaviour. Traditionally, analysing the performance of continuous-variable quantum error correction codes involved deriving specific phase-space representations for each code individually, a process that is both time-consuming and lacks a generalisable structure. This new framework provides a single mathematical structure for all codes within this family, simplifying the process of determining how errors manifest within continuous-variable quantum error correction, a technique utilising the continuous properties of light, specifically, the quadrature amplitudes of electromagnetic fields, to protect quantum information. Bosonic codes leverage the harmonic oscillator nature of these fields, offering advantages in certain error correction scenarios. The development of this unified approach is significant because it allows researchers to focus on the underlying principles of error propagation rather than being bogg
Quantum ZeitgeistLoading...0
quantum-computingPaderborn University Achieves 93.8% Photonic C-NOT Gate Fidelity
Researchers at Paderborn University have demonstrated a photonic controlled-not (C-NOT) gate with a fidelity of 93.8 ± 1.4%, a key step toward building practical quantum computers. The team’s design utilizes a time-multiplexed architecture, creating a fully reconfigurable quantum processor. By combining their C-NOT gate with a single qubit gate, the researchers successfully generated all four Bell states, proving the system can perform more complex quantum calculations and function as a building block for advanced quantum circuits. Photonic Qubit Encoding and Quantum System Foundations A fidelity of 93.8 ± 1.4% in a photonic C-NOT gate demonstrates a significant advance toward building practical quantum processors. Researchers at Paderborn University have achieved this level of accuracy, suggesting a potential pathway to more reliable quantum computation. The team’s success hinges on a time-multiplexed architecture, enabling a fully reconfigurable quantum processor, a departure from the fixed operational limitations of many existing systems. This allows for dynamic adjustment of the quantum circuit, offering greater flexibility and scalability as quantum systems grow in complexity. The foundation of this work lies in the manipulation of qubits, described as “the fundamental information unit consisting of a quantum system with two levels,” and the need for operations capable of altering their quantum state. While various physical platforms, including charged particle spins, trapped ions, and superconducting systems, are being explored, the Paderborn team champions photonic quantum computing. They explain that in photonic quantum computing, photons are the carriers of quantum information, highlighting the advantage of excellent isolation from environmental interference and ease of manipulation. The C-NOT gate, essential for constructing any gate-based quantum circuit, is realized through a novel interferometric scheme leveraging time-bins separated by a variable delay
Quantum ZeitgeistLoading...0
quantum-computingTsinghua University Team Proposes Geometrical-Configuration Modulation Framework for Free-Space QKD
A new framework for free-space quantum key distribution (QKD) utilising geometrical-configuration modulation has been presented. Yu-Ming Bai and colleagues at Tsinghua University detail a system where a single photon’s spatial separation acts as a modulation variable, enabling the creation of superposition states. This approach, termed GM-QKD, uses spatial degrees of freedom and offers a potential pathway to mitigate the effects of link drift in free-space communications. The $R-x$ and $R-Δx$ protocol models, alongside defined procedures for state preparation and information reconciliation, represent a key step towards a practically implementable and secure free-space QKD system. Spatial separation of single photons overcomes alignment challenges in free-space quantum key distribution A framework for free-space quantum key distribution (QKD) at Tsinghua University significantly improves upon prior methods by mitigating slowly varying centre drift, a limitation that previously hindered reliable quantum signal transmission. Traditional free-space QKD systems are acutely susceptible to pointing errors and atmospheric turbulence, causing signal degradation and requiring extremely precise alignment between sender and receiver. These challenges are exacerbated over longer distances, limiting the practical range of such systems. Geometrical-configuration modulation (GM-QKD) encodes information using the spatial separation of a split single photon, creating superposition states and utilising spatial degrees of freedom in a novel way. This innovative approach offers inherent resilience to these alignment issues, as the information is encoded not in the absolute position of the photon, but in the relationship between the split components. Employing an $R-Δx$ protocol, the system tackles a key challenge in free-space communications, enabling stable links where precise alignment was previously unattainable. Alice, the sender, prepares single-photon superposition states by coher
Quantum ZeitgeistLoading...0
quantum-computingIndian Institute of Technology Kanpur: Researchers Unlock Radial Schmidt Mode Detection for Quantum Information Science
Radhika Prasad and colleagues at Indian Institute of Technology Kanpur and Paderborn University now measure the radial Schmidt spectrum of entangled photons, unlocking potential advances in quantum information science. They demonstrate a new technique for extracting high-dimensional radial Schmidt modes, previously a key obstacle in utilising radial entanglement. Their work theoretically proves that azimuthal averaging of spontaneously parametrically down-converted photons results in a radial Schmidt-decomposed form, and experimentally achieves measurement of up to 50 radial Schmidt modes with approximately 98% fidelity. This breakthrough provides a vital capability for harnessing the advantages of high-dimensional entanglement and expands the set of tools for quantum technologies. High-fidelity detection unlocks access to previously unexplored radial entanglement of photons The researchers at Indian Institute of Technology Kanpur have measured up to 50 radial Schmidt modes with 98% fidelity, a substantial improvement over previous detectors. Limited to four or eight modes with poor efficiency or performance, earlier devices could not achieve this level of precision. This breakthrough crosses a critical threshold, enabling access to high-dimensional radial entanglement previously impossible due to a lack of suitable detection techniques. The significance of this improvement lies in the ability to encode more information per photon, a crucial factor in increasing the capacity and security of quantum communication protocols. Prior limitations stemmed from the difficulty in efficiently separating and identifying the numerous spatial modes that constitute high-dimensional entanglement. Azimuthal averaging of spontaneously parametrically down-converted photons yields a radial Schmidt-decomposed form, simplifying the process of extracting these modes. Spontaneous parametric down-conversion (SPDC) is a nonlinear optical process where a pump photon is split into two entangl
Quantum ZeitgeistLoading...0
quantum-computingSouth Korea Expands International Alliances with Canada, UK, and EU at Quantum Korea 2026
South Korea Expands International Alliances with Canada, UK, and EU at Quantum Korea 2026 South Korea’s Ministry of Science and ICT (MSIT) has leveraged the Quantum Korea 2026 exhibition at the Dongdaemun Design Plaza (DDP) in Seoul as a centralized geopolitical cooperation platform. Amid tightening global export controls on deep-tech materials, Deputy Prime Minister and Minister of Science and ICT Hongwoong Bae along with First Vice Minister Hyeok-chae Koo led a series of intergovernmental roundtables. The multilateral frameworks are engineered to link South Korea’s sovereign research infrastructure directly with trusted international partners across 16 countries, mitigating supply chain vulnerabilities by standardizing cross-border R&D protocols. [ MSIT Bilateral Quantum Frameworks ] Canada Alliance ──► Joint NRF-NSERC initiatives, Eureka/Eurostars matching, and Mitacs talent loops. UK Procurement ──► Cross-linking the 2027 Grand Manufacturing Challenge with the £1B ProQure model. European Union ──► Deepened structural integration through Horizon Europe and EuroQCI cluster access. The bilateral agreement with Canada focuses on expanding cooperative commercial R&D via established international scaling pipelines like Eureka and Eurostars. By coordinating resource allocations between the National Research Foundation of Korea (NRF) and the Natural Sciences and Engineering Research Council of Canada (NSERC), the framework enables joint industry participation in quantum computing, communications, and sensing. The partnership is further reinforced by student and research specialist exchange pipelines handled through Mitacs, paired with direct business-to-business matchmaking between the Korea Quantum Industry Association and Quantum Industry Canada—drawing active collaboration interests from optical hardware developers like Xanadu. The United Kingdom roundtable focused heavily on industrial commercialization and public infrastructure procurement. South Korean del
Quantum Computing ReportLoading...0
quantum-computingIntegrated Photon-Memory Entanglement Generation using Dual Photonic Resonators
--> Quantum Physics arXiv:2607.01324 (quant-ph) [Submitted on 1 Jul 2026] Title:Integrated Photon-Memory Entanglement Generation using Dual Photonic Resonators Authors:Alexander Kolar, Ian Chin, Conner Fong, Daniil M. Lukin, Melissa A. Guidry, Milan Palei, Jelena Vučković, Tian Zhong View a PDF of the paper titled Integrated Photon-Memory Entanglement Generation using Dual Photonic Resonators, by Alexander Kolar and 7 other authors View PDF HTML (experimental) Abstract:Scalable quantum networks require the efficient generation, storage, and synchronization of entanglement between photonic qubits and quantum memories. Quantum repeater architectures based on absorptive rare-earth-ion photonic memories offer a promising route toward highly multiplexed quantum networking, but integrating spectrally matched photon sources and quantum memories within a common platform remains a major challenge. Here we demonstrate an integrated photonic architecture for telecom photon-memory entanglement generation based on dual silicon-carbide microring resonators. One resonator operates as an entangled photon-pair source, while the other functions as a cavity-enhanced atomic-frequency-comb quantum memory. The memory resonator achieves an ensemble cooperativity of 1.9 and is intrinsically spectrally matched to the photon source, enabling storage of entangled telecom photons without spectral modification. We generate and verify photon-memory entanglement with a single-pair interference visibility of 88.1 $\pm$ 10.6%. By exploiting the multimode capacity of the memory, we demonstrate high-dimensional photon-memory qudit entanglement spanning up to 63 temporal modes, leading to a maximum photon information efficiency of 5.1 Ebits per detected photon and a peak on-chip photon-memory entanglement rate of 5.6 kEbits s$^{-1}$. These results establish the first integrated platform for photon-memory entanglement generation and provide a scalable route toward chip-scale quantum repeaters and memor
arXiv Quantum PhysicsLoading...0
quantum-computingBose University of Science and Technology: Researchers Boost Quantum Teleportation Fidelity Using Squeezed Light States
A new method for continuous-variable quantum teleportation utilising a photon-subtracted two-mode squeezed Fock state as an entangled resource has been investigated by Ankita Chatterjee and Arpita Chatterjee at Bose University of Science and Technology. A phase-space analysis of this process within the Braunstein-Kimble protocol is presented, deriving analytical expressions for success probability and fidelity with coherent and squeezed state inputs. Detailed analysis of squeezing parameters and beam-splitter transmissivity reveals a key dependence of teleportation fidelity on resource characteristics, although substantial enhancement is not observed. The study shows that while the resource state possesses non-Gaussian properties, achieving fidelity exceeding classical benchmarks proves challenging, limited to a specific symmetric configuration at low squeezing levels, offering vital insight into the limitations of such states for quantum communication. Wigner function analysis defines teleportation fidelity with photon subtraction A phase-space method, utilising the Wigner characteristic function, represents the probability distribution of a quantum state in a manner similar to how graphs depict likelihoods in classical probability. This mathematical tool provides a quasi-probability distribution that allows for the representation of quantum states in phase space, defined by position and momentum-like variables. Unlike classical probability distributions, the Wigner function can take on negative values, signifying non-classical behaviour and entanglement. This technique simplifies calculations for states created through non-Gaussian operations, notoriously difficult to model conventionally, allowing calculations to bypass complex mathematical expressions and multidimensional integrations often needed to assess quantum teleportation fidelity. The Wigner function is particularly useful in analysing continuous-variable systems, where quantum information is encoded in
Quantum ZeitgeistLoading...0