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-computingQuantum Computing News: Xanadu and Horizon Go Public as Quantum Stocks Gain Investor Momentum - TipRanks
Quantum Computing News: Xanadu and Horizon Go Public as Quantum Stocks Gain Investor Momentum TipRanks
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quantum-computingLinear-optical generation of hybrid GKP entanglement from small-amplitude cat states
--> Quantum Physics arXiv:2603.19870 (quant-ph) [Submitted on 20 Mar 2026] Title:Linear-optical generation of hybrid GKP entanglement from small-amplitude cat states Authors:Shohei Kiryu, Yohji Chin, Masahiro Takeoka, Kosuke Fukui View a PDF of the paper titled Linear-optical generation of hybrid GKP entanglement from small-amplitude cat states, by Shohei Kiryu and 3 other authors View PDF HTML (experimental) Abstract:Hybrid bosonic codes combining bosonic codes with photon states offer a promising pathway for fault-tolerant quantum computation. However, the efficient generation of such states in optical setups remains technically challenging due to the requirement for complex non-Gaussian resources. In this paper, we propose a novel scheme to efficiently generate hybrid entangled states between a GKP qubit and a photon-number state using small-amplitude cat states as the primary resource. We apply a breeding process using small-amplitude cat states to increase the non-Gaussianity of the input states. This method requires only linear optical elements and homodyne measurements. Furthermore, we demonstrate that this protocol can be extended to generate hybrid qudit states. This scheme has the potential to provide a resource-efficient and experimentally attractive route toward implementing hybrid quantum error correction. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.19870 [quant-ph] (or arXiv:2603.19870v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2603.19870 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Shohei Kiryu [view email] [v1] Fri, 20 Mar 2026 11:36:52 UTC (256 KB) Full-text links: Access Paper: View a PDF of the paper titled Linear-optical generation of hybrid GKP entanglement from small-amplitude cat states, by Shohei Kiryu and 3 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev | next &
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quantum-computingXanadu to Become First Publicly Listed Photonic Quantum Technology Company
Shareholders of Crane Harbor Acquisition Corp. have approved a business combination with Xanadu Quantum Technologies Inc., establishing Xanadu as the first publicly listed company focused on photonic quantum technology. The transaction is expected to finalize on March 26, 2026, and will result in the combined company, operating as Xanadu Quantum Technologies Limited, beginning trading on both the Nasdaq and Toronto Stock Exchange under the ticker symbol “XNDU” on March 27, 2026. This move is backed by approximately US302 million in gross proceeds, and potential investment of up to CAD390 million from the governments of Canada and Ontario; these funds are intended to advance Xanadu’s scalable, room-temperature quantum computing platform. Bill Fradin, Chief Executive Officer of Crane Harbor, said that the company is excited to help Xanadu continue pursuing its mission of widely accessible, fault tolerant quantum computing, signaling a new era for the 2016-founded Canadian company. Xanadu & Crane Harbor: USD302M Nasdaq Listing Approved Shareholders approved a business combination valued at approximately USD302 million. This capital infusion, separate from potential CAD390 million investments from the Canadian and Ontario governments through Project OPTIMISM, positions Xanadu to pursue its technical roadmap and scale its unique approach to quantum computation. Unlike many quantum computing efforts reliant on superconducting or trapped ion technologies, Xanadu champions a light-based system operating at room temperature, which offers advantages for broader accessibility and reduced infrastructure costs. This public listing will provide crucial funding and a platform to accelerate commercialization, a key focus for the company. The company’s development of PennyLane, an open-source software library, further demonstrates its commitment to democratizing access to quantum tools and fostering a wider developer ecosystem. Founded in 2016, Xanadu has rapidly become a leader
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quantum-computingXanadu to List on Nasdaq and TSX Following Shareholder Merger Approval
Xanadu to List on Nasdaq and TSX Following Shareholder Merger Approval Crane Harbor Acquisition Corp. (Nasdaq: CHAC) shareholders have approved the business combination with Xanadu Quantum Technologies Inc., scheduled to close on March 26, 2026. The resulting entity, Xanadu Quantum Technologies Limited, is expected to begin trading on the Nasdaq and the Toronto Stock Exchange (TSX) on March 27, 2026, under the ticker symbol “XNDU”. This transaction establishes Xanadu as the first publicly listed photonic quantum technology company. The merger is expected to provide gross proceeds of approximately US$302 million, consisting of funds from Crane Harbor’s trust account and a committed private placement (PIPE). This capital is separate from a proposed investment of up to CAD$390 million currently under negotiation with the governments of Canada and Ontario through Project OPTIMISM. The combined funding is intended to support the execution of Xanadu’s technical roadmap and the commercialization of its scalable photonic quantum platform. Xanadu utilize a light-based approach to quantum computing, focusing on the development of modular and networked systems designed to operate at room temperature. This photonic architecture aims to bypass the cryogenic infrastructure requirements typical of other quantum modalities. In addition to its hardware development, the company maintains PennyLane, an open-source software library for quantum programming and machine learning, which is used for application development across heterogeneous hardware environments. The transition to a public-market platform is intended to provide the capital base required for Xanadu to scale its hardware and software ecosystems. Founded in 2016 by CEO Christian Weedbrook, the company focuses on the development of fault-tolerant quantum solutions for industrial and institutional applications. Xanadu plans to leverage its public listing and government partnerships to advance the availability of photonic quan
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quantum-computingXanadu to List on Nasdaq and TSX, Aims to Advance Photonic Quantum Computing
Xanadu Quantum Technologies Inc. is expected to become the first publicly listed company focused on photonic quantum computing, following shareholder approval of Crane Harbor Acquisition Corp. to complete their business combination. The transaction, expected to finalize on March 26, 2026, will see Xanadu’s shares begin trading on both the Nasdaq and Toronto Stock Exchange under the ticker symbol XNDU on March 27, 2026, pending final approvals. This move is supported by approximately US302 million in gross proceeds from the deal, and ongoing negotiations with the Canadian and Ontario governments for up to CAD390 million through Project OPTIMISM. “We’re excited to help Xanadu continue pursuing its mission of widely accessible, fault tolerant quantum computing,” said Bill Fradin, Chief Executive Officer of Crane Harbor, indicating a commitment to bolstering Xanadu’s position as a leader in light-based quantum computing technology. Xanadu and Crane Harbor Complete Business Combination Approval The approval of the business combination between Xanadu Quantum Technologies Inc. and Crane Harbor Acquisition Corp. by shareholders marks a pivotal moment, potentially unlocking significant capital for the advancement of photonic quantum computing. The deal is projected to deliver approximately US302 million in gross proceeds to Xanadu, supplementing ongoing negotiations for substantial Canadian government investment. This infusion of funds is not merely financial; it signifies growing confidence in Xanadu’s unique approach to quantum computation, which utilizes photons, particles of light, rather than the more conventional superconducting qubits employed by many competitors. Unlike systems requiring extremely low temperatures, Xanadu’s technology operates at room temperature, a characteristic that dramatically reduces infrastructure costs and expands potential deployment scenarios. This dual listing is strategically important, providing access to a broader investor base and bols
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quantum-computingXanadu Quantum SPAC Deal Approved, Targets $302 Million Raise
Insider Brief Crane Harbor shareholders approved the proposed business combination with Xanadu Quantum Technologies, clearing a key step toward the company going public. The combined company is expected to begin trading on Nasdaq and the Toronto Stock Exchange under the ticker “XNDU” following a planned March 26, 2026 closing. The transaction is expected to provide approximately $302 million in gross proceeds, with additional potential funding under a separate Canadian government investment still under negotiation. PRESS RELEASE — Crane Harbor Acquisition Corp. (“Crane Harbor”) (Nasdaq: CHAC) today announced that its shareholders approved all proposals necessary to complete the previously announced business combination with Xanadu Quantum Technologies Inc. (“Xanadu”), a leading photonic quantum computing company, at Crane Harbor’s extraordinary general meeting of shareholders. The approval represents an important milestone toward completing the transaction and advancing Xanadu’s scalable photonic quantum technology platform. The closing of the business combination is expected to occur on March 26, 2026. Following the closing, the combined company will operate under the name Xanadu Quantum Technologies Limited (the “Company”), with its shares anticipated to begin trading on the Nasdaq Stock Market (“Nasdaq”) and the Toronto Stock Exchange (“TSX”) under the ticker symbol “XNDU” on March 27, 2026, subject to the satisfaction of customary closing conditions and stock exchange approval. The transaction is expected to deliver gross proceeds of approximately US$302 million to the Company, consisting of funds held in Crane Harbor’s trust account and proceeds from a fully committed PIPE financing. These proceeds are separate from and incremental to the previously announced negotiations with the Government of Canada and the Government of Ontario for an up to CAD$390 million investment under Project OPTIMISM. The proposed support remains subject to the completion of due dilige
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quantum-computingQuantum Firms Xanadu, Quantum Horizon to List as Capital Needs Outweigh Stocks Rout
Quantum computing companies are braving turbulent public markets in order to raise money to develop the still experimental technology, with two more taking critical steps toward debuts this week alone.
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quantum-computingFCAT and Xanadu Release Research Enabling Approximate Pattern Discovery with Quantum Computers
The Fidelity Center for Applied Technology (FCAT) and Xanadu have jointly released research detailing a new method for harnessing the power of quantum computers with imperfect, real-world data. Traditionally, quantum algorithms have struggled with the “noisy” conditions typical of most datasets, limiting their practical application. This collaboration addresses that challenge by enabling approximate pattern discovery instead of requiring precise mathematical structures. This shift allows quantum computers to identify relationships and dependencies within realistic datasets, potentially unlocking valuable applications for machine learning and data analysis. “One of the biggest challenges in applying advanced computation to real data is that the structure is never clean or exact,” said Michael Dascal, VP Quantum Technology at FCAT. Christian Weedbrook, Founder and CEO of Xanadu, added that the research “opens up a foundational quantum computing framework for new and exciting applications.” Hidden Subgroup Problem Adaptation for Imperfect Data Quantum computing’s potential to analyze complex data sets depends on overcoming a critical limitation. Traditional algorithms relying on the Hidden Subgroup Problem (HSP) demand pristine, highly structured data, which is rare in practical applications. Their new methods focus on identifying approximate patterns, mirroring the inherent complexities found within genuine datasets, rather than requiring exact mathematical structures. This adaptation expands the scope of quantum algorithms beyond idealized scenarios and into practical problem-solving. This approach doesn’t seek perfect matches but rather uncovers the underlying relationships and dependencies that characterize real-world information, potentially unlocking applications in areas like machine learning and data analysis. To accelerate progress, FCAT and Xanadu have released their research and associated code publicly, encouraging further development and collaboration with
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quantum-computingQuiX Quantum Joins Italy’s Q-Alliance to Build a Quantum Hub Supporting the National Quantum Technology Strategy
Insider Brief QuiX Quantum has signed a Memorandum of Understanding with Q-Alliance, a consortium of quantum technology companies, research institutions, and governmental bodies aimed at creating a pan-European quantum ecosystem centered at Italy’s National Center “Volta” in Lombardy. As a Q-Alliance member, QuiX Quantum will contribute its measurement-based, universal photonic quantum computing technology with room-temperature operation to support research and applications in pharmaceuticals, materials science, logistics, and financial services. The collaboration aligns with Italy’s National Strategy for Quantum Technologies and aims to leverage Italy’s expertise in quantum optics while focusing on quantum computing applications in finance, manufacturing, pharmaceuticals, aerospace, data centers, and simulation. PRESS RELEASE — QuiX Quantum, a leading provider of photonic quantum computing hardware, announced today the signing of a Memorandum of Understanding (MoU) with the Q-Alliance, consortium uniting leading quantum technology companies, research institutions, and governmental bodies, with the goal of creating a pan-European quantum ecosystem. As a member of Q-Alliance, QuiX Quantum will contribute its leadership in measurement-based, universal quantum computing with superior interconnectivity, scalability and room-temperature operation. Q-Alliance will provide infrastructure to support research, entrepreneurship, and real-world quantum applications across key sectors such as pharmaceuticals, materials science, logistics, and financial services. This collaboration builds on QuiX Quantum’s expansion across Europe and U.K., further solidifying its position as the European leading photonic quantum computing company. Q-Alliance is an ambitious new initiative to establish a world-class quantum computing hub located at the National Center “Volta” in Lombardy, Italy. Formed in alignment with Italy’s National Strategy for Quantum Technologies, Q-Alliance brings togethe
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quantum-computingDie to wafer direct bonding of (100) single-crystal diamond thin films for quantum optoelectronics
--> Quantum Physics arXiv:2603.17140 (quant-ph) [Submitted on 17 Mar 2026] Title:Die to wafer direct bonding of (100) single-crystal diamond thin films for quantum optoelectronics Authors:Dominic Lepage, Amin Yaghoobi, Heidi Tremblay, Dominique Drouin View a PDF of the paper titled Die to wafer direct bonding of (100) single-crystal diamond thin films for quantum optoelectronics, by Dominic Lepage and 2 other authors View PDF Abstract:This work unlocks the manufacturing of nanophotonic quantum systems that exploit the unique material properties of single-crystal diamond (SCD). We achieve this by introducing a semiconductor-compatible process for the direct bonding of multiple high-quality, ultrathin diamond films onto a carrier wafer, enabling the subsequent parallel nanofabrication of optoelectronic integrated circuits. Central to this approach is a new diamond surface-preparation method that avoids boiling tri-acid mixtures while producing exceptionally clean 20 um thin single crystals. These platelets are bonded side-by-side to 100 mm silica wafers and exhibit a record shear strength of 45.1 MPa for (100)-oriented diamond, surpassing all previously reported bonding attempts. Evidence indicates that the bonding is dominated by van der Waals interactions, likely arising from mismatched protonation mechanisms between Si-OH and C-OH surface terminations, rather than from covalent-bond-driven mechanisms. Despite this non-molecular nature, the heterostructures remain stable through liquid immersions and standard nanofabrication steps. Because the method depends primarily on surface cleanliness and roughness rather than specific chemistries, it is broadly transferable across wafer materials. This capability to parallel-bond ultrathin SCD films onto large-area substrates provides a scalable route to high-performance platforms spanning nanophotonic quantum technologies, high-power electronics, MEMS, and biotechnology. Subjects: Quantum Physics (quant-ph); Materials Scienc
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quantum-computingXanadu, NRC, and U of T Target Battery Evolution via Quantum RIXS Simulations
Xanadu, NRC, and U of T Target Battery Evolution via Quantum RIXS Simulations Xanadu Quantum Technologies, in collaboration with the University of Toronto and the National Research Council of Canada (NRC), has unveiled a novel quantum algorithm designed to accelerate the discovery of next-generation battery materials. The research, published as a pre-print, focuses on simulating Resonant Inelastic X-ray scattering (RIXS), a high-fidelity characterization technique used to monitor how high-capacity batteries degrade over time. By accurately modeling RIXS spectra, the team aims to stabilize lithium-excess cathode active materials, which are critical for the development of higher-energy-density power sources but have remained historically difficult to analyze via classical computational methods. The technical core of the breakthrough lies in overcoming the simulation limitations of Li-rich NMC (Nickel Manganese Cobalt) cathodes. Classical simulations struggle with the complex quantum dynamics of these materials, leading to a “prediction gap” in battery longevity. Xanadu’s photonic quantum approach provides a native framework for quantum dynamics, allowing for the characterization of chemical structures and degradation pathways that are beyond the reach of standard supercomputers. A primary highlight of the research is the drastic reduction in resource requirements for practical implementation. The algorithm is optimized to run on early, utility-scale fault-tolerant quantum computers, requiring fewer than 500 logical qubits to simulate classically challenging Li-rich structures. This benchmark positions the algorithm within the expected capabilities of near-term hardware, shifting quantum battery research from a long-term theoretical goal to a near-term industrial application. The project was conducted under the NRC’s Applied Quantum Computing Challenge program, emphasizing a “market-driven” focus on solving electrochemical bottlenecks. Beyond the laboratory, the partne
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quantum-computingXanadu Demonstrates Quantum Computing Approach for High-Capacity Battery Analysis
Xanadu Quantum Technologies Inc. has demonstrated a new quantum computational algorithm that may accelerate the discovery of advanced battery materials, potentially unlocking higher-capacity lithium batteries for future energy demands. The research, a collaboration with the University of Toronto and the National Research Council of Canada (NRC), reveals how fault-tolerant quantum computers can overcome limitations in simulating Resonant Inelastic X-ray scattering (RIXS), a crucial technique for analyzing battery degradation. For complex materials like Li-rich NMC cathodes, the algorithm requires fewer than 500 logical qubits, a feasible scale for emerging quantum computers. “We believe our results position fault-tolerant quantum computing as an essential tool for the battery industry and next-generation battery materials development,” said Christian Weedbrook, Founder and Chief Executive Officer of Xanadu, highlighting the potential for a quantum-aided pipeline in battery design. Quantum Algorithm Accelerates Battery Material Discovery via RIXS Simulation The advance, detailed in a pre-print article, addresses a key bottleneck in the development of lithium-rich NMC cathodes, materials expected to significantly increase battery energy density. The core of the innovation lies in applying fault-tolerant quantum computing to simulate RIXS spectra, something currently beyond the capabilities of even the most powerful classical computers. Existing computational models struggle to accurately predict RIXS results, hindering the ability to effectively evaluate and refine new battery materials. This new algorithm circumvents those limitations, opening the door to material design and optimization using computer simulations. Importantly, the algorithm is designed to operate on early, utility-scale quantum computers, requiring fewer than 500 logical qubits, a threshold considered achievable with near-term quantum hardware. This pragmatic approach distinguishes the work from more
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quantum-computingXanadu, the University of Toronto and the National Research Council of Canada Unveil Quantum Algorithms for Lithium-ion Battery Simulations
TORONTO, March 18, 2026 (GLOBE NEWSWIRE) — Xanadu Quantum Technologies Inc. (“Xanadu”), a leading photonic quantum computing company, has today announced a novel quantum computational algorithm to accelerate the discovery and analysis of next-generation battery materials. Published as a pre-print article, Xanadu’s new research, in collaboration with the University of Toronto and the National Research […]
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quantum-computingFCAT and Xanadu Adapt Hidden Subgroup Problem for Real-World Data Analysis
FCAT and Xanadu Adapt Hidden Subgroup Problem for Real-World Data Analysis The Fidelity Center for Applied Technology (FCAT®) and Xanadu have released joint research aimed at transitioning the Hidden Subgroup Problem (HSP) from a theoretical construct into a practical tool for industrial data analysis. Traditionally, quantum algorithms for the HSP—which form the basis for Shor’s Algorithm—require perfectly structured, “clean” data to achieve a quantum advantage. The new methods introduced by the FCAT and Xanadu teams allow quantum systems to process noisy, imperfect data, enabling the discovery of approximate patterns and dependencies that occur in real-world financial and commercial datasets. The technical innovation involves shifting the algorithmic focus from identifying exact mathematical symmetries to uncovering statistical approximations of hidden structures. By relaxing the requirement for precise mathematical groups, the researchers have developed a framework that is more resilient to the “noise” inherent in large-scale data analysis and current NISQ (Noisy Intermediate-Scale Quantum) hardware. This approach is intended to bridge the gap between abstract group theory and Quantum Machine Learning (QML), specifically for tasks involving complex relationship mapping and pattern recognition where classical high-performance computing (HPC) faces scaling bottlenecks. To accelerate the adoption of these methods, FCAT and Xanadu have open-sourced the research and the accompanying code, which is compatible with the PennyLane software library. This transparency allows the broader quantum community to benchmark the approximate HSP approach against traditional data analysis methods. The collaboration represents a strategic effort by Fidelity to identify “useful” quantum applications that can eventually be scaled on Xanadu’s photonic quantum hardware to support advanced machine learning models for its institutional and individual customers. For full technical details on
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quantum-computingQuiX Quantum and Q-Alliance to Establish Italian Photonic Quantum Hub - Quantum Computing Report
QuiX Quantum and Q-Alliance to Establish Italian Photonic Quantum Hub QuiX Quantum entered into a Memorandum of Understanding (MoU) with Q-Alliance, a consortium of industrial, academic, and governmental organizations, to develop a quantum computing hub at the National Center “Volta” in Lombardy. This collaboration is part of Italy’s National Strategy for Quantum Technologies, intended to incorporate photonic quantum hardware into the national computing framework. The project establishes an open platform for cross-border cooperation aimed at developing a distributed European quantum ecosystem and enhancing regional technological sovereignty. The technical implementation focuses on measurement-based, universal photonic quantum computing systems that operate at room temperature. These systems utilize high-interconnectivity photonic circuits to execute quantum gates, providing a scalable alternative to cryogenic-based architectures. The Q-Alliance infrastructure at the “Volta” center supports the scaling of these photonic qubits and provides the hardware interfaces required for quantum simulation and data processing tasks, leveraging established research in quantum optics. Applications within the hub target the aerospace, pharmaceutical, logistics, and financial sectors, specifically focusing on materials science and algorithmic optimization. The partnership seeks to translate photonic hardware capabilities into verified use cases for data centers and industrial manufacturing. The objective is to develop industrially relevant quantum algorithms that meet the computational requirements of the European market, utilizing the inherent connectivity and room-temperature stability of the photonic modality. For further details on the Q-Alliance consortium and the National Center “Volta” infrastructure, consult the official QuiX Quantum announcement here.
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quantum-computingFCAT, Xanadu Researchers Advance Quantum Methods for Noisy Real-World Data
Insider Brief Fidelity’s Center for Applied Technology and Xanadu developed a quantum computing approach that adapts the Hidden Subgroup Problem to work with noisy, real-world data, advancing practical quantum applications. The research introduces methods that allow quantum systems to identify approximate patterns and relationships in imperfect datasets, addressing a key limitation of earlier quantum algorithms that required ideal conditions. The teams have open-sourced their findings and code to accelerate broader research, aiming to move quantum computing from theoretical promise toward real-world use cases, particularly in areas like machine learning. PRESS RELEASE — The Fidelity Center for Applied Technology (FCAT®), an innovative technology resource for Fidelity Investments, has announced new research focused on developing real-world applications of quantum computing techniques based on computational tasks with a known quantum advantage. Conducted in collaboration with Xanadu, a leading photonic quantum computing company, the research adapts a well-known concept in quantum computing called the Hidden Subgroup Problem (HSP). Traditionally, quantum solutions to the HSP have only worked well in perfectly clean and highly structured scenarios – conditions that rarely exist in the real world. Because of this, its practical value has been limited. In their new research, the FCAT and Xanadu teams introduced methods that let quantum computers handle noisy, imperfect data instead of requiring flawless inputs. Rather than searching for a precise mathematical structure, their approach can uncover approximate patterns – the kinds of relationships and dependencies that naturally appear in real datasets. This shift could make quantum algorithms far more useful for real-world applications. “One of the biggest challenges in applying advanced computation to real data is that the structure is never clean or exact,” said Michael Dascal, VP Quantum Technology at the Fid
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quantum-computingSimultaneous amplitude and phase spectroscopy using two-photon interference
--> Quantum Physics arXiv:2603.15944 (quant-ph) [Submitted on 16 Mar 2026] Title:Simultaneous amplitude and phase spectroscopy using two-photon interference Authors:Kyle M. Jordan (1,2,3), Yingwen Zhang (1,2,3), Frédéric Bouchard (1), Duncan England (1), Philip J. Bustard (1), Benjamin J. Sussman (1,2,3), Jeff S. Lundeen (2,3), Andrew H. Proppe (1,2,3) ((1) National Research Council Canada, (2) Department of Physics and Nexus for Quantum Technology, University of Ottawa, (3) University of Ottawa-NRC Joint Center for Extreme Photonics) View a PDF of the paper titled Simultaneous amplitude and phase spectroscopy using two-photon interference, by Kyle M. Jordan (1 and 19 other authors View PDF Abstract:Quantum spectroscopy seeks to probe chemical systems using nonclassical light, which has properties that are qualitatively and quantitatively different than conventional light sources. One promising technique uses intensity-correlated twin beams of light to reduce the noise sources inherent to absorption spectroscopy. However, measurements of the phase shift imparted by the chemical sample, which provides complementary information to the absorption, continue to be a challenge. Here, we propose and demonstrate a scheme using entangled photon pairs that can simultaneously measure both the absorption and phase shift of a sample with extremely low optical intensities and with relatively fast few-minute acquisition times. This method combines the previous use of intensity correlations with a broadband quantum interferometer utilizing two-photon interference to measure the complete linear optical response of the sample. Our work shows that precise measurements of absorption can also be made phase-sensitive using suitable choices of probe beam and detection scheme. This enables a new class of quantum spectroscopy schemes which measure absorption and phase with a single probe. Our technique is relevant to the characterization of a wide array of chemical and biological samples, s
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quantum-computingXanadu moves closer to public listing as quantum race heats up
The Canadian tech startup plans a dual listing on both the Nasdaq and the Toronto Stock ExchangeAuthor of the article:You can save this article by registering for free here. Or sign-in if you have an account.Startup Xanadu Quantum Technologies Inc. is preparing a public listing with the promise that it’s going to build one of the first quantum-powereddata centres by 2030. If successful, the deal would break a long drought.Subscribe now to read the latest news in your city and across Canada.Subscribe now to read the latest news in your city and across Canada.Create an account or sign in to continue with your reading experience.Create an account or sign in to continue with your reading experience.It has been several years since a Canadian technology company went public on the Toronto Stock Exchange. Toronto-based Xanadu is trying to gain a listing via a merger with blank-check company Crane Harbor Acquisition Corp. in a transaction that would value the business at more than US$3 billion.The merger vote is scheduled for Thursday, with the listing set to happen by the end of March. Xanadu would get US$455 million in net cash, assuming no redemptions from Crane shareholders, with new money coming in from investors including Advanced Micro Devices Inc. and BMO Global Asset Management. Bessemer Venture Partners is one of the company’s longstanding investors.Breaking business news, incisive views, must-reads and market signals. Weekdays by 9 a.m.By signing up you consent to receive the above newsletter from Postmedia Network Inc.A welcome email is on its way. If you don't see it, please check your junk folder.The next issue of Posthaste will soon be in your inbox.We encountered an issue signing you up. Please try againInterested in more newsletters? Browse here.Xanadu chief executive Christian Weedbrook, 49, came a long way to found his company in 2016. Born and raised in Australia, he landed in Toronto as a postdoctoral research fellow in quantum technology and never left.
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quantum-computingUltrafast laser pulses bring diamond-based quantum internet closer to reality
The controlled generation of single photons is an essential element of numerous quantum technology applications, such as quantum networks and quantum computing. A research team has now demonstrated the successful application of the new SUPER (Swing-UP of the quantum EmitteR population) method. The approach facilitates the controlled generation of light particles (photons). Results of the study were recently published in the journal Nature Communications.
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quantum-computingMoving Atoms Unlock Faster Quantum Computer Operations
Researchers at the Max-Planck-Institut für Quantenoptik, led by Ohad Lib, have demonstrated velocity-selective control of neutral atoms, enabling mid-circuit state preparation and measurement without disturbing stationary atoms. The work introduces atom velocity as a novel degree of freedom for neutral-atom quantum architectures, reducing the need for complex control hardware and minimising delays traditionally associated with atom transport. They experimentally achieved a CZ entangling gate fidelity of 99.86%, generated an eight-qubit entangled cluster state with an average stabilizer value of 0.830, and implemented a quantum error-detection code with 99.0% logical Bell-state fidelity, representing a significant step towards fast and scalable quantum computing. Doppler-shifted laser light controls’ atom velocities for quantum computation The velocity of individual atoms represents a key innovation in this new architecture for neutral-atom quantum computing. The Doppler effect, a phenomenon analogous to the changing pitch of a siren as it moves towards or away from an observer, is exploited to selectively address and manipulate atoms without physically repositioning them. Instead of relying on complex systems to shuttle qubits, the fundamental units of quantum information, precisely controlling atomic speed induces subtle shifts in the frequency of interacting laser light. This creates ‘velocity zones’ where specific operations can be performed on moving atoms while leaving stationary atoms unaffected, thereby enabling parallel processing and reducing operational overhead. The principle hinges on the fact that the observed frequency of light depends on the relative motion between the source and the observer; faster-moving atoms experience a different frequency shift than slower ones. Strontium-88 atoms were used to successfully generate an eight-qubit entangled cluster state with an average stabilizer value of 0.830, alongside an error-detection code achieving 99.0%
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