Quantum Cryptography & Cybersecurity: Post-Quantum Security & QKD
Post-quantum cryptography news: NIST PQC standards, quantum-safe security, quantum key distribution. Quantum threats & encryption updates.
Quantum computing poses an existential threat to current encryption infrastructure while simultaneously offering unprecedented security through quantum cryptographic protocols. The cybersecurity community faces a dual imperative: migrating to post-quantum cryptographic standards resistant to quantum attacks while deploying quantum key distribution (QKD) for long-term information security.
Post-Quantum Cryptography (PQC) standards from NIST include CRYSTALS-Kyber (lattice-based key encapsulation), CRYSTALS-Dilithium (lattice-based digital signatures), SPHINCS+ (hash-based signatures), and FALCON. These algorithms rely on mathematically hard problems believed resistant to quantum attacks.
India's Quantum Cryptography and Cybersecurity Initiatives
India's National Quantum Mission includes quantum communication as one of four verticals with substantial allocation. The Thematic Hub on Quantum Communication at IIT Madras, established as the IITM C-DOT Samgnya Technologies Foundation, focuses on quantum cryptography, post-quantum security, quantum key distribution networks, quantum memory, quantum repeaters, and satellite-enabled quantum communication.
The Department of Telecommunications (DoT) and Ministry of Electronics and Information Technology (MeitY) coordinate quantum-safe migration for critical infrastructure. The Defence Research and Development Organisation (DRDO) leads quantum-safe security scheme design and testing according to NQM documentation.
Bengaluru-based QNu Labs, selected under NQM startup support in November 2024, develops quantum-safe cryptography and secure communication systems including QKD systems and quantum random number generators for defense, telecom, and data security applications.
The NQM targets developing quantum-resilient encryption and post-quantum cryptographic frameworks for India's critical infrastructure, with satellite-based secure quantum communications over 2000km and inter-city quantum key distribution as specific deliverables.
quantum-computingAnyon Chains Reveal Entanglement Patterns Defying Typical Quantum Corrections
Yale Yauk and colleagues at Max-Planck-Institut für Quantenoptik, in a collaboration with The University of Melbourne, have investigated entanglement within one-dimensional anyon chains, extending previous research on symmetry-resolved entanglement to quantum groups. They derive analytical expressions for average anyonic entanglement entropy and its variance, revealing a surprising lack of universal corrections in the large system size expansion. The findings show the typicality of entanglement, with variance decaying exponentially with system size, and confirm chaotic mid-spectrum eigenstates align with Haar-random predictions. An ‘anyonic Page curve’ is established as a key benchmark for quantum chaos in topological many-body systems, linking anyonic entanglement to broader universality observed in quantum many-body physics. Mapping entanglement distribution via symmetry resolution in anyonic systems Symmetry-resolved entanglement entropy proved key to this investigation, a technique for carefully mapping entanglement while accounting for inherent system symmetries. It dissects entanglement, distributing it amongst different, related quantum states, similar to sorting a mixed bag of marbles by colour rather than simply counting the total. The technique enabled derivation of precise mathematical descriptions for both the average entanglement and its variance within the anyonic chains, allowing detailed predictions about system behaviour. This approach enabled isolation and examination of subtle entanglement patterns, revealing the absence of expected corrections and establishing the ‘typicality’ of entanglement. Anyonic chains, one-dimensional systems exhibiting unique quantum properties, were the focus of the investigation. The work found only a subleading topological correction, unlike alternatives utilising the standard von Neumann entropy, due to the well-behaved nature of the chosen entanglement measure under tensor products and respect for charge superselecti
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quantum-computingQuantum Channels Obeying Causality Are Exceptionally Rare Among Local Channels
Robin Simmons from the Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, and colleagues have determined that causal channels represent a vanishingly small subset within the broader set of local channels, meaning they are ‘nowhere dense’. The findings connect these observations to quantum information theory, revealing that causal unitaries possess a Haar measure of zero within the complete set of unitaries acting on a lattice. This work offers key insight into the implications for quantum field theory measurement models and a deeper understanding of the limitations on quantum operations. It builds upon Sorkin’s demonstration that causality represents an additional restriction beyond mere locality. Topological analysis reveals the limited scope of causal quantum channels Operator space theory proved key in establishing the rarity of causal quantum channels. This mathematical framework, originating from the study of operator algebras, allows for a detailed analysis of the structure of quantum channels by treating them as elements within a complex vector space. Specifically, the research focuses on ‘completely bounded maps’ between algebras of quantum operators, these maps represent the evolution of quantum states through a channel. A completely bounded map ensures that the channel’s action doesn’t introduce excessive noise or distortion during quantum information transfer. The precise characterisation of channel behaviour is achieved by examining the topological properties of these maps, a branch of mathematics concerned with properties preserved under continuous deformations. The analysis reveals that the set of causal channels lacks an ‘interior’; this means that no causal channel possesses a neighbourhood entirely composed of other causal channels. In simpler terms, no matter how slightly you perturb a causal channel, you inevitably move outside the realm of causal behaviour. This topological property provides a rigorous fou
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Network Structure Significantly Impacts Entanglement Distribution Performance across 81 Topologies
Researchers at University College London, led by Jazz E. Z. Ooi, have conducted a systematic investigation into the impact of network topology on the efficient distribution of multipartite entanglement, a crucial element for realising future quantum technologies. The team meticulously studied four entanglement distribution protocols across 81 real network topologies, identifying four distinct performance regimes dependent on the underlying network structure. This work offers key insights into optimising resource allocation and protocol selection for quantum networks intended to support applications such as distributed quantum computing and cryptography. Network topology sharply impacts entanglement distribution efficiency and scalability The distribution of entanglement, a uniquely quantum phenomenon where two or more particles become linked regardless of distance, now surpasses a 90% rate, even when utilising only 80% of nodes functioning as quantum repeaters. This represents a significant advancement, as achieving high-fidelity entanglement distribution has historically been a major challenge, particularly in networks with limited resources. Previously, sparse quantum networks struggled to maintain acceptable distribution rates. However, this study demonstrates that well-designed topologies can effectively mitigate the impact of repeater node reduction, sustaining high performance despite constrained resources. Conversely, poorly connected networks experience substantial degradation, retaining less than half the distribution rate under identical conditions. The quantum repeaters are essential as they overcome the limitations imposed by signal loss in optical fibres, extending the range of quantum communication. Each repeater node performs entanglement swapping, effectively relaying the entangled state over longer distances. The systematic analysis across 81 real-world network layouts revealed four distinct performance regimes, categorising how different entangleme
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quantum-computingQCi Deploys Dirac-3 System on Quantum Corridor Network
Insider Brief Quantum Corridor and Quantum Computing Inc. deployed a Dirac-3 quantum optimization machine on a commercial quantum-safe network to provide secure, on-demand access. The system is installed at a commercial data center in Indiana and integrated with fiber infrastructure secured using quantum key distribution. The deployment expands enterprise and research access to quantum optimization capabilities across the Midwest via a subscription-based model. PRESS RELEASE — Quantum Corridor, the first inter-state quantum safe commercial communications network in North America, and Quantum Computing Inc. (“QCi”/Nasdaq: QUBT), an innovative, quantum optics and integrated photonics technology company, today announced the placement of a QCi Dirac-3 quantum optimization machine on the network. The partnership will allow enhanced customer access for institutions and commercial customers with secure, on-demand access to Dirac-3 over Quantum Corridor’s network. This comes on the heels of Quantum Corridor’s recent breakthrough with Toshiba, implementing Quantum Key Distribution (QKD) over Quantum Corridor’s commercial fiber infrastructure, which provides 10G commercial connection to the QCi machine secured with Toshiba QKD. Deployed at the Digital Crossroad Data Center in Hammond, Ind., the machine placement marks the first data center installation of a Dirac-3 machine and the first installation of its kind in a commercial data center environment. The Dirac-3 enables a novel revenue approach for QCi and Quantum Corridor alike, allowing clients to access Dirac-3 via Quantum Corridor’s existing subscription and service framework. “We are proud to partner with Quantum Corridor to deliver the first data center installation of our Dirac-3 computer, designed to solve complex optimization problems,” said Dr. Yuping Huang, CEO of QCi. “This collaboration enhances secure and scala
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quantum-computingThree-Dimensional Spaces Confirm Long-Suspected Mathematical Inequality
A. S. Holevo and A. V. Utkin of the Steklov Mathematical Institute of the Russian Academy of Sciences propose a new inequality for norms within $d$-dimensional $l_p$ spaces, offering a formulation that, despite its simplicity, has proven difficult to prove rigorously. Their work includes a proof for the case where $d=$3 and thorough numerical verification supporting the conjecture for dimensions up to 200. It addresses key questions in mathematical analysis and connects to problems in quantum information theory, specifically the minimisation of output entropy in quantum channels and the use of inherent symmetries. Deconstructing multidimensional inequalities using Fourier spectral analysis Fourier analysis provided a powerful technique to dissect complex inequalities by expanding functions into infinite trigonometric series. This process can be likened to a prism separating white light into its constituent colours, revealing underlying patterns and structures within the data. The application of Fourier spectral analysis allows for the decomposition of the inequality into a sum of simpler, more manageable components, each representing a specific frequency or mode. This decomposition facilitates the examination of the inequality’s behaviour across multiple dimensions, enabling the identification of symmetries and simplifying the overall problem. The technique relies on representing functions in terms of their frequency components, which are then analysed individually to determine their contribution to the inequality. Specifically, the method identifies conditions, akin to finding the precise viewing angle, under which the inequality holds true, rigorously proving it for three dimensions and allowing numerical validation up to 200 dimensions. The choice of Fourier basis is crucial, as it allows for efficient representation of functions with periodic or spatially varying properties, common in many physical systems. This approach contrasts with direct analytical methods,
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quantum-computingToshiba and LQUOM Partner on Long-Distance Quantum Communication Research
Insider Brief Toshiba and LQUOM have signed a joint research agreement to study long-distance quantum key distribution using quantum repeater technology. The project will evaluate combinations of QKD protocols and repeater architectures to address distance, scalability, and performance challenges. Running from March 2026 to March 2027, the collaboration aims to support future quantum communication networks and quantum internet development. PRESS RELEASE — Toshiba Corporation (Headquarters: Kawasaki, Kanagawa, Japan; President and CEO: Taro Shimada; hereinafter “Toshiba”) and LQUOM Inc. (Headquarters: Yokohama, Kanagawa, Japan; CEO: Kazuya Niizeki; hereinafter “LQUOM”) have entered into a joint research agreement to explore the extension of quantum key distribution (QKD) over long distances. This collaboration forms part of broader efforts to build long-term technological foundations and an ecosystem toward the realization of the quantum internet. In this joint research project, the companies will study the technical challenges and feasibility of extending next-generation QKD over long distances by combining QKD systems with quantum repeater systems, a key technology expected to underpin future quantum communication networks. QKD is attracting increasing attention as a secure cryptographic communication technology that leverages the principles of quantum mechanics and is theoretically immune to decryption even by quantum computers. Efforts toward its social implementation are actively underway across various fields, including finance, healthcare, energy, and inter–data center communications. However, several technical challenges remain in achieving longer transmission distances, higher speeds, and large-scale network deployment.Quantum repeaters are a key technology that enables long-distance transmission of quantum states without degrading them. They are therefore regarded as an essential component for extending the reach of quantum communications, including QKD, an
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quantum-computingImpact of Topology on Multipartite Entanglement Distribution Protocols in Quantum Networks
--> Quantum Physics arXiv:2603.25920 (quant-ph) [Submitted on 26 Mar 2026] Title:Impact of Topology on Multipartite Entanglement Distribution Protocols in Quantum Networks Authors:Jazz E. Z. Ooi, Evan Sutcliffe, Alejandra Beghelli View a PDF of the paper titled Impact of Topology on Multipartite Entanglement Distribution Protocols in Quantum Networks, by Jazz E. Z. Ooi and 2 other authors View PDF HTML (experimental) Abstract:Quantum networks will rely on entanglement distribution to enable multi-user applications such as distributed quantum computing and cryptography. While multipartite entanglement distribution routing protocols have been extensively studied on idealised grid topologies, less is understood about how real network structure shapes their performance and resource requirements. We present a systematic study of four routing protocols for multipartite entanglement distribution, each characterised by the number of paths (single-path and multi-path) and routing strategy (star-based and tree-based), over 81 real network topologies. We identified four distinct topology-dependent performance regimes, where: (i) all protocols perform poorly, (ii) tree-based protocols dominate, (iii) multi-path protocols dominate, or (iv) all protocols perform well. By correlating clusters with graph metrics, we also provide structural explanations for the varied performance of specific protocols. Additionally, motivated by the anticipated high cost of repeaters, we investigated the impact of repeater trimming on the performance of multi-path protocols. Topology strongly governs how far repeater nodes can be removed from the network while maintaining a given performance (distribution rate). For instance, in networks where only 80% of nodes operate as repeaters, well-performing topologies are able to retain over 90% of the distribution rate; whereas sparse, weakly connected graphs exhibit rapid performance degradation, retaining less than half of the distribution rate. Our resul
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quantum-computingPhD in quantum information theory topics at National University of Singapore
PhD in quantum information theory topics at National University of Singapore Application deadline: Thursday, May 14, 2026Employer web page: National University of Singapore, Department of PhysicsJob type: PhDTags: quantum informationquantum cryptographyconvex optimizationnonlocalityQuantum Key DistributionI am recruiting PhD students for a newly formed group at the National University of Singapore (https://www.physics.nus.edu.sg/faculty/ernest-tan-ying-zhe/), on the topics of quantum information theory, quantum cryptography, and convex optimization applications in those areas. For more details on the application process, contact me and send me a short CV, and also refer to https://www.physics.nus.edu.sg/student/prospective-doctor-of-philosophy-... and https://www.science.nus.edu.sg/graduates/msc-by-research/application-inf... . While the application deadline for the next intake is 15 May (for positions starting next January), contact me for information about other possibilities. Log in or register to post comments
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quantum-computingWent to RSAC2026 expecting AI hype. Left actually scared about Q-Day for the first time
Just got back from RSAC. You know how these things go, wall to wall with AI this, AI that, vendors slapping "machine learning" on a toaster. But the one thing that actually stopped me cold? IBM's quantum safe computing exhibit. Google just dropped a formal "Q-Day" warning that RSA and ECC, the stuff protecting literally our emails, bank accounts, VPNs, crypto, could get broken by 2029. I know quantum computers aren't there yet. But "Harvest Now, Decrypt Later" is already a thing. Adversaries are literally scooping up encrypted data right now, sitting on it, waiting for the math to catch up. So that IBM hardware on the floor? Seeing it in person made me realize this isn't a theoretical problem anymore. It's engineering. They're actually building for post-quantum. Are we actually moving on this? Or are we going to be the generation that knew the deadline was coming and did nothing until it was too late? NIST already published the PQC algorithms. The standards exist. So why does it feel like nobody's in a hurry? Anyway. RSAC was worth it just for that wake-up call. Glad I saw the hardware. submitted by /u/hhakker [link] [comments]
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quantum-computingGoogle Sets 2029 Timeline for Post-Quantum Cryptography Migration
Google has established 2029 as the target date for a complete migration to post-quantum cryptography, a move intended to strengthen digital security against the emerging threat of quantum computing. The company’s decision follows a recent call to action to secure the quantum era before powerful quantum computers can compromise existing encryption methods; this timeline accounts for advancements in quantum computing hardware, error correction, and resource estimates. “As a leader in both quantum and PQC, it’s our responsibility to lead by example and share an ambitious timeline,” said Heather Adkins, VP of Security Engineering, emphasizing the need for industry-wide acceleration of digital transitions. Google is already integrating PQC digital signature protection, specifically ML-DSA, into Android 17, aligning with standards set by the National Institute of Standards and Technology, and extending PQC solutions to Chrome and Cloud services. 2029 Post-Quantum Cryptography Migration Timeline This timeline, revealed by Heather Adkins, VP of Security Engineering, and Sophie Schmieg, Senior Staff Cryptography Engineer, responds to the growing threat of “store-now-decrypt-later” attacks, where encrypted data is intercepted and saved for future decryption by a quantum computer. The company’s decision reflects an adjusted threat model prioritizing authentication services and digital signature migrations, recognizing that current encryption standards face immediate risk while digital signatures represent a future vulnerability. This proactive stance stems from Google’s position as a leader in both quantum computing and post-quantum cryptography, prompting a commitment to share an ambitious timeline to encourage industry-wide adoption. The company stated that they hope to provide the clarity and urgency needed to accelerate digital transitions not only for Google, but also across the industry. The urgency is driven by the potential for a cryptographically relevant quantum comp
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quantum-computingQuantum Links Weaken over Time in Coupled Oscillators, Study Reveals
Somayeh Mehrabankar and colleagues at Queensland Quantum and Advanced Technologies Institute, in collaboration with researchers from Shahid Chamran University of Ahvaz and the National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, modelled the time-dependent changes in quantum discord, entanglement, and purity of two interacting asymmetric harmonic oscillators. Their analysis, utilising the Kossakowski-Lindblad master equation and beginning with a squeezed vacuum state, reveals how factors such as temperature, dissipation, and coupling influence the persistence of these delicate quantum properties. The research shows that quantum discord generally persists for longer than entanglement, exhibiting greater resilience to environmental effects and offering potential avenues for designing more robust quantum information processing systems. Discord and entanglement resilience to decoherence in asymmetric oscillators Entanglement measures now survive up to 35% longer than in previous asymmetric oscillator models, a substantial increase enabled by optimising the squeezing parameter. This improvement is significant because maintaining quantum states for even short durations is essential for performing quantum computations and secure quantum key distribution, as this extended lifespan crosses a critical threshold for viable quantum information storage, previously limited by rapid decoherence. The asymmetric harmonic oscillators, unlike their symmetric counterparts, exhibit differing frequencies for each oscillator, introducing an additional degree of freedom that influences the dynamics of quantum correlations. Increasing the squeezing parameter, which reduces quantum uncertainty in one quadrature of the electromagnetic field at the expense of increased uncertainty in the other, enhances initial correlations, providing a protective effect against thermal noise and dissipation. This technique effectively ‘hardens’ the quantum state against environmental per
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quantum-computingLooking for Research Partners in Quantum-Safe Cybersecurity
Hi, I’m working on research in cybersecurity focused on post-quantum cryptography and quantum migration. Looking to connect with others interested in collaboration or high-level discussions. Feel free to reach out. submitted by /u/ImaginaryAdeptness49 [link] [comments]
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quantum-computingVRadar Security Achieves Patent-Pending Status for Quantum-Resistant System
Vietnamese software engineer Nguyen Xuan Dong has secured patent-pending status for VRadar, a cloud-native Security Operations Center (SOC) platform designed with a post-quantum cryptographic system to protect sensitive data from future decryption threats. Developed entirely by Dong over eight months with the aid of artificial intelligence, VRadar implements NIST-standardized post-quantum algorithms in production, addressing the emerging risk of “Harvest Now, Decrypt Later” attacks. The platform processed 1.35 million real security alerts over 34 days with a 91% autonomous resolution rate, demonstrating its ability to function as a fully operational SOC. “People assume a platform this complex requires a team of 10-20 engineers,” said Dong, “I built it alone by working with AI as my development partner—not replacing engineering judgment, but accelerating the execution.” AI-Augmented Development Builds Full-Stack SOC Platform A lone developer has constructed a complete Security Operations Center platform, leveraging artificial intelligence to overcome the resource constraints typically associated with such complex systems. Nguyen Xuan Dong, a Vietnamese software engineer and cybersecurity researcher, built VRadar, a cloud-native SOC platform with over 150 features, in just eight months, a feat accomplished without a traditional development team. The platform’s architecture includes 41 backend modules, five AI agents, multi-tenant support, and four integrated payment gateways, demonstrating the potential of AI-augmented development. VRadar has secured patent-pending status (Application No. 1-2026-02438) for its post-quantum cryptographic secure log transport system, positioning it as an early adopter of NIST-standardized post-quantum algorithms in a production environment. This addresses the emerging threat of “Harvest Now, Decrypt Later” attacks, where adversaries stockpile encrypted data for future decryption using quantum computers. Five specialized AI agents, inclu
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quantum-computingSystems with ‘memory’ Now Accurately Modelled Using New Equations
Guilherme de Sousa and Diogo O. Soares-Pinto at the Instituto de Física de São Carlos, Universidade de São Paulo, have created an equation modelling general feedback processes, including those exhibiting non-Markovian behaviour. The equation is a key step towards understanding and controlling quantum systems with memory effects and frequency-dependent responses, potentially broadening the scope of quantum signal processing applications. The master equation accommodates feedback signals of arbitrary structure and dimensionality, offering a flexible framework for analysing information processing in quantum systems. Encoding quantum memory into auxiliary degrees of freedom for deterministic modelling The core of this technique lies in expanding the system’s descriptive space, effectively creating a more detailed ‘picture’ of the quantum process. This expansion isn’t merely a mathematical trick; it’s rooted in the fundamental principle of preserving information. By increasing the number of variables used to describe the system, the researchers can account for the influence of past events without violating the laws of quantum mechanics. Reformulating feedback as a standard, or Markovian, process operating within this enlarged space achieves this; a Markovian process assumes future behaviour depends only on the present state, not the past. This is particularly important in quantum systems where information isn’t simply ‘lost’ but is instead transferred to correlations between different parts of the system. Past interactions are mathematically encoded into auxiliary degrees of freedom, adding extra variables to track relevant historical information. These auxiliary degrees of freedom act as a ‘memory’ of the system’s past, allowing the deterministic equation to accurately predict its future behaviour. This approach allows for a more comprehensive understanding of quantum dynamics by incorporating the influence of past events. Traditional methods often simplify quantum dyna
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quantum-computingPodcast with John Martinis, 2025 Nobel Prize Winner and CTO of Qolab
Overview In this podcast, 2025 Nobel Prize winner John Martinis was recently interviewed at the 2026 APS March Meeting by GQI’s own George Schwartz and Steve Lee from the PR firm San Francisco Agency. John discusses his foundational work in superconducting qubits and his current role as CTO of the startup Qolab. He explains Qolab’s vision to reach a million physical qubits by utilizing wafer-scale semiconductor manufacturing and “deposition and etch” techniques rather than traditional liftoff processes. Martinis highlights the importance of systems engineering and improved wiring solutions, such as moving from coaxial cables to integrated flex circuits, to make quantum scaling more economical. Addressing future security, he suggests the world should prepare for cryptographically relevant quantum computers within five to ten years by adopting quantum-resistant protocols. Finally, he reflects on his transition from academia to business, noting that his career has been defined by a unique ability to “pick apart arguments” and a dedication to clear scientific communication. Transcript George Schwartz: I’m George Schwartz, I’m with the Quantum Computing Report by GQI. And at GQI what we do is we try to serve as a third-party independent understanding of the entire quantum ecosystem specifically in computing, sensing, and networking. And just kind of getting a sense of all these roadmaps that are being proposed nowadays and understanding where may be particular challenges that you’ve know very well into reaching those scaling and reaching utility-scale quantum computing or cryptographically relevant quantum computing. Steve Lee: So, John, why don’t you tell us what you’re famous for here, we all know that you’ve just recently have won the Nobel Prize for physics this year in 2025. And but maybe you could tell us a little bit more about your history and the basics of how that came about. John Martinis: Well, the Nobel Prize was for essentially my thesis experiment in aroun
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quantum-computingGoogle Opens Early Access to ‘Willow’ Quantum Processor, Invites Experimental Proposals
Insider Brief Google launched the Willow Early Access Program, offering selected researchers exclusive access to its not-yet-public quantum processor to run tailored experiments. Applicants must submit anonymized proposals by May 15, 2026, detailing executable quantum circuits, measurable outcomes, and a dedicated researcher to carry out the work. Selection will prioritize feasibility on current hardware, including noise considerations, and the potential for high-impact scientific results or new experimental techniques. This week, Google spread some tantalizing morsels signaling its push toward quantum commercialization is accelerating, from exploring neutral atom computing to shortening its timeline for post-quantum security. Now, a brand mew announcement indicates its Willow processor is ready for another concrete step in that direction. Google just announced it is opening limited early access to its Willow quantum processor, inviting researchers to propose experiments that could test the limits of current quantum hardware ahead of broader availability. The Willow Early Access Program will provide selected applicants with exclusive use of the processor, which remains unavailable to the public. According to the program guidelines, researchers must submit detailed experimental proposals by May 15, 2026, with selections announced by July 1, 2026. The initiative is designed to push beyond incremental simulations and encourage experiments that take advantage of Willow’s specific capabilities. Applicants are required to propose quantum circuits tailored to the device and identify measurable outcomes — known as observables — that could form the basis of a scientific publication. While supporting numerical simulations are encouraged, the program emphasizes work that extends beyond what classical systems can easily replicate. Google is also requiring teams to dedicate at least one researcher — such as a Ph.D. student or postdoctoral fellow — to execute the proposed experim
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quantum-computingToshiba and LQUOM Collaborate on Long-Distance Quantum Repeater Research - Quantum Computing Report
Toshiba and LQUOM Collaborate on Long-Distance Quantum Repeater Research Toshiba Corporation and LQUOM Inc. have entered into a joint research agreement to study the extension of Quantum Key Distribution (QKD) ranges using quantum repeater technology. The project, scheduled to run from March 2026 to March 2027, focuses on evaluating the technical feasibility of integrating Toshiba’s QKD systems with LQUOM’s quantum repeater architectures. This collaboration is intended to address the transmission distance limitations of current fiber-optic quantum communications, a necessary step toward the development of large-scale quantum networks and the eventual “quantum internet.” The research will specifically analyze the optimal combinations of QKD protocols and repeater designs from both performance and implementation perspectives. Toshiba is tasked with studying QKD architectures and protocols, leveraging its research history in high-speed key distribution dating back to 1999. LQUOM, a startup originating from Yokohama National University, will focus on entanglement-based quantum repeater system architectures. These repeaters are designed to relay quantum states over long distances without the degradation associated with standard fiber loss, enabling secure transmission without the need for trusted nodes. This partnership builds upon a strategic relationship established in 2023 when Toshiba invested in LQUOM via its corporate venture capital arm. By combining Toshiba’s commercially deployed QKD technology with LQUOM’s specialized focus on entanglement sources and repeater nodes, the project aims to establish technical foundations for next-generation information infrastructure. The findings are expected to support the social implementation of quantum-secure communications in fields such as healthcare, finance, and energy, where long-distance data-center-to-data-center security is a priority.
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quantum-computingToshiba and LQUOM Collaborate on Long-Distance Quantum Repeater Research
Toshiba and LQUOM Collaborate on Long-Distance Quantum Repeater Research Toshiba Corporation and LQUOM Inc. have entered into a joint research agreement to study the extension of Quantum Key Distribution (QKD) ranges using quantum repeater technology. The project, scheduled to run from March 2026 to March 2027, focuses on evaluating the technical feasibility of integrating Toshiba’s QKD systems with LQUOM’s quantum repeater architectures. This collaboration is intended to address the transmission distance limitations of current fiber-optic quantum communications, a necessary step toward the development of large-scale quantum networks and the eventual “quantum internet.” The research will specifically analyze the optimal combinations of QKD protocols and repeater designs from both performance and implementation perspectives. Toshiba is tasked with studying QKD architectures and protocols, leveraging its research history in high-speed key distribution dating back to 1999. LQUOM, a startup originating from Yokohama National University, will focus on entanglement-based quantum repeater system architectures. These repeaters are designed to relay quantum states over long distances without the degradation associated with standard fiber loss, enabling secure transmission without the need for trusted nodes. This partnership builds upon a strategic relationship established in 2023 when Toshiba invested in LQUOM via its corporate venture capital arm. By combining Toshiba’s commercially deployed QKD technology with LQUOM’s specialized focus on entanglement sources and repeater nodes, the project aims to establish technical foundations for next-generation information infrastructure. The findings are expected to support the social implementation of quantum-secure communications in fields such as healthcare, finance, and energy, where long-distance data-center-to-data-center security is a priority. For the complete details on the joint research agreement and the organizations’ tec
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quantum-computingQuantum Computing Weekly Round-Up: Week Ending March 28, 2026
This Quantum Computing Weekly Round-Up highlights a busy week where governments and companies ramped up efforts in quantum security, navigation, and computing power. Key stories include new post-quantum tools at RSAC and significant funding for national quantum programs. The developments show the field rapidly moving toward practical applications. The post Quantum Computing Weekly Round-Up: Week Ending March 28, 2026 appeared first on The Qubit Report.
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quantum-computingRandom Routing Boosts Quantum Network Entanglement Distribution Rates
Scientists at Nanyang Technological University have demonstrated a stochastic multipath routing scheme for distributing entanglement across quantum repeater networks, addressing the critical challenge of efficiently sharing limited entangled pairs amongst numerous users. Ankit Mishra and Kang Hao Cheong detail their findings, revealing that this approach, where entanglement requests are randomly distributed along multiple network paths, sharply improves performance compared to traditional single-path or globally optimised routing strategies. Their analytic modelling, combined with large-scale simulations, consistently demonstrates enhanced end-to-end entanglement rates across a range of network conditions, including varying distance, traffic load, and signal loss. These findings highlight stochastic multipath routing as a practical and lightweight classical control mechanism to enhance the scalability and efficiency of emerging quantum communication infrastructure. A single parameter governs the bias between shorter and longer routes, offering a tunable balance between latency and resource utilisation. Using a distance-dependent lossy network model incorporating finite per-link capacities and probabilistic entanglement swapping, they have developed a protocol for distributed quantum communication, offering a potential solution to the resource allocation problems inherent in quantum networks. Biased Stochastic Multipath Routing for Enhanced Quantum Entanglement Distribution A stochastic multipath routing technique, conceptually similar to distributing vehicular traffic across multiple roads during peak hours to alleviate congestion, underpins this advance. Entanglement, a uniquely quantum mechanical phenomenon where two or more particles become correlated in such a way that they share the same fate, no matter how far apart they are, analogous to two flipped coins always landing on opposite sides, is distributed without rigidly selecting the shortest or longest path.
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