Government Quantum Initiatives: National Programs & Policy
Government quantum news: National Quantum Initiative, quantum policy, EU Quantum Flagship, China quantum. Quantum regulation & programs.
Governments worldwide recognize quantum technologies as strategic priorities. India's National Quantum Mission (NQM), approved on 19 April 2023, represents a comprehensive framework with ₹6,003.65 crore allocation for eight years.
India's National Quantum Mission Structure
Thematic Hubs (T-Hubs) under NQM: Quantum Computing: Foundation for QC Innovation at IISc Bengaluru (lead), with partners including IIT Delhi, IIT Bombay, TIFR Mumbai, and others; Quantum Communication: IITM C-DOT Samgnya Technologies Foundation at IIT Madras with C-DOT Delhi; Quantum Sensing & Metrology: Qmet Tech Foundation at IIT Bombay; Quantum Materials & Devices: QMD Foundation at IIT Delhi.
Key NQM Deliverables: Intermediate-scale quantum computers with 50-1000 physical qubits in 8 years; satellite-based secure quantum communications over 2000 km; inter-city quantum key distribution over 2000 km; multi-node quantum networks with quantum memories; magnetometers with high sensitivity and atomic clocks for precision timing; quantum materials including superconductors and novel semiconductor structures.
Supporting Infrastructure
Quantum fabrication facilities at IISc Bengaluru (₹720 crore total investment); quantum fabrication facilities at IIT Bombay; smaller facilities at IIT Delhi and IIT Kanpur; dilution refrigeration laboratories at TIFR Mumbai, IISc Bengaluru, and TIFR Hyderabad.
Other Government Programs: DRDO Young Scientists Laboratory for Quantum Technologies (DYSL-QT) at DIAT Pune; Centre for Excellence in Quantum Technology (CEQT) at IISc Bengaluru (MeitY supported); Centre for Quantum Information, Communication and Computing (CQuICC) at IIT Madras; ISRO space-based quantum communication initiatives.
quantum-computingOpen Rank Faculty Position - Quantum Science and Technologies - Sorbonne University Abu Dhabi
Application deadline: Wednesday, June 10, 2026Employer web page: https://www.sorbonne.ae/vacancies/open-rank-faculty-position-quantum-physicsJob type: OtherProfessorshipApplications will remain open until the position is filled. Submitted applications will be reviewed on a rolling basis, with the evaluation process beginning after a four‑week period. We seek an established researcher in quantum science and technologies with a strong and well-developed research track record, capable of leading and expanding SUAD’s research activities in this area. The successful candidate should demonstrate sufficient academic maturity to sustain an independent research program while contributing to the development of quantum-related teaching. The successful candidate will provide strategic leadership and academic excellence in teaching, research, and service within the Department and across Sorbonne University Abu Dhabi (SUAD). As an accomplished scholar with a strong and internationally recognized research record in quantum technologies, the appointee is expected to develop an ambitious research program in theoretical physics and/or computer science, with a focus on quantum information and quantum technologies. Research activities may span the key pillars of quantum technologies—including quantum computing, quantum simulation, quantum metrology, and quantum communication. The appointee will collaborate closely with Sorbonne University and leading research laboratories such as LKB and LIP6 and will receive the resources needed to build and consolidate a Quantum Research Group at SUAD, including access to dedicated funding and co funding mechanisms for doctoral fellowships, as well as opportunities to host visiting scholars. One of the roles of the Quantum Research Group will be to foster collaborations within the UAE and with prominent global partners, supporting the growth of national and regional quantum ecosystems and positioning SUAD as a hub for excellence in qua
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quantum-computingClassical Data Limits Quantum Computing’s Broad Impact
Haimeng Zhao is addressing a fundamental hurdle preventing widespread adoption of quantum computing: efficiently integrating classical data into quantum algorithms. Despite advances in experimental capabilities, demonstrating broad societal impact beyond niche areas like quantum materials simulation and cryptanalysis remains a significant challenge, largely due to the difficulty of accessing real-world, classically-generated data in a quantum format, a problem known as the data loading problem. Their new framework, termed quantum oracle sketching, offers a solution by processing data as a continuous stream and applying small quantum rotations to incrementally build an accurate quantum oracle. “We live in an effectively classical world, dammit, and maybe classical computers and AI already suffice for most of our problems,” Zhao playfully suggests, adapting a famous quote from Richard Feynman, highlighting the need to bridge the gap between classical data and quantum processing. Data Loading Bottleneck Hinders Broad Quantum Advantage While quantum computers excel at simulating quantum materials and certain cryptographic tasks, these applications are inherently quantum or possess mathematical structures easily exploited by quantum algorithms; extending this advantage to everyday problems proves far more difficult. The core issue stems from the fact that most modern computation relies on processing vast amounts of noisy, classical data, the very fuel powering the success of machine learning and artificial intelligence. This data, originating from the macroscopic classical world, doesn’t naturally lend itself to the delicate, specialized structures quantum computers require. Imagine attempting to simultaneously read a million movie reviews; the conventional, sequential access of classical computers presents a bottleneck for quantum systems. To address this, Haimeng Zhao has developed a framework called “quantum oracle sketching,” which allows for optimal access to classi
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quantum-computingComputing quantum magic of state vectors
AbstractNon-stabilizerness, also known as “magic,'' quantifies how far a quantum state departs from the stabilizer set. It is a central resource behind quantum advantage and a useful probe of the complexity of quantum many-body states. Yet standard magic quantifiers, such as the stabilizer Rényi entropy (SRE) for qubits and the mana for qutrits, are costly to evaluate numerically, with the computational complexity growing rapidly with the number $N$ of qudits. Here we introduce efficient, numerically exact algorithms that exploit the fast Hadamard transform to compute the SRE for qubits ($d=2$) and the mana for qutrits ($d=3$) for pure states given as state vectors. Our methods compute SRE and mana at cost $O(N d^{2N})$, providing an exponential improvement over the naive $O(d^{3N})$ scaling, with substantial parallelism and straightforward GPU acceleration. We further show how to combine the fast Hadamard transform with Monte Carlo sampling to estimate the SRE of state vectors, and we extend the approach to compute the mana of mixed states. All algorithms are implemented in the open-source Julia package HadaMAG, which provides a high-performance toolbox for computing SRE and mana with built-in support for multithreading, MPI-based distributed parallelism, and GPU acceleration. The package, together with the methods developed in this work, offers a practical route to large-scale numerical studies of magic in quantum many-body systems.Featured image: HadaMAG workflow: a quantum state vector $|\psi\rangle$ with $d^N$ amplitudes is fed through $d^N$ fast Hadamard transforms, i.e., butterfly networks of additions and subtractions, to efficiently extract all $d^{2N}$ Pauli expectation values $\langle P \rangle$, from which measures of quantum magic, the stabilizer Rényi entropy $M_2(|\psi\rangle)$ for qubits ($d=2$) and the mana $\mathcal{M}(|\psi\rangle)$ for qutrits ($d=3$), are obtained.Popular summaryStabilizer states form a special class of quantum states that align
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quantum-computingYaqumo Secures Seed Extension From $350M Quantum VC
Yaqumo Inc., a Tokyo-based startup developing scalable neutral-atom quantum computers, has secured a Seed Extension Round from Quantonation II FPCI, marking the venture capital fund’s first investment in a Japanese company. The $350 million quantum-focused fund selected Yaqumo after a global search for promising deep-tech startups, recognizing the company’s technological capabilities and potential. This funding will accelerate Yaqumo’s research and development, expand its team, and drive commercialization efforts, strengthening its position within the growing quantum ecosystem. Kazuhiro Nakashoji, CEO of Yaqumo, said the investment is a strong validation of the company’s technology and potential, and demonstrates that Japan’s quantum industry is gaining global attention. Quantonation’s $350M Portfolio Includes Yaqumo for Seed Extension Quantonation’s investment in Yaqumo expands its $350 million portfolio to include a Japanese quantum computing startup; the firm has previously backed 38 deep-tech companies across ten countries in the US, Europe, and Asia since its founding in 2018. This Seed Extension Round funding will allow Yaqumo, headquartered in Chiyoda-ku, Tokyo, to bolster research and development of its scalable neutral-atom quantum computers, a technology the company believes is crucial for effective quantum error correction and, ultimately, practical fault-tolerant quantum computing. The investment utilizes a J-KISS convertible equity instrument, a streamlined financing method for the Japanese startup ecosystem that avoids immediate valuation determination. Olivier Tonneau, Partner at Quantonation, emphasized the firm’s confidence in the company’s business potential and Japan’s quantum science foundation, stating that Yaqumo’s team and vision are compelling for making quantum technology practical. The company, established on April 1, 2025, focuses on hardware-software co-design to achieve fast clock rates, a key element in its approach to scalable quantum
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quantum-computingA Thermodynamic SU(1,1) Witness Framework for Double-Quantum NMR Signals in Neural Tissue
--> Quantum Physics arXiv:2604.07641 (quant-ph) [Submitted on 8 Apr 2026] Title:A Thermodynamic SU(1,1) Witness Framework for Double-Quantum NMR Signals in Neural Tissue Authors:Christian Kerskens View a PDF of the paper titled A Thermodynamic SU(1,1) Witness Framework for Double-Quantum NMR Signals in Neural Tissue, by Christian Kerskens View PDF HTML (experimental) Abstract:Entanglement criteria based on variances or Fisher information are well developed for compact collective spin algebras, but their extension to non-compact dynamical sectors is less straightforward. In particular, double-quantum (DQ) observables associated with effective SU(1,1) structures can lead to formally unbounded classical fluctuation estimates unless additional physical constraints are imposed. In this note, we develop a thermodynamic witness framework in which the classically accessible fluctuation sector is strictly bounded by finite-temperature detailed-balance conditions and motionally narrowed sequence-transfer limits. By analyzing the quantum dynamical semigroup of the spin-bath interaction, we demonstrate that spontaneous transient pair correlations generated by a stationary incoherent bath are contractively capped near an amplitude of \(10^{-9}\). Furthermore, classical coherent sequence amplification is empirically bounded to \(\mathcal{O}(10^{-2})\) in motionally narrowed tissue. The resulting functional provides a concrete, theoretically derived bounding framework against which macroscopic DQ anomalies (e.g., fractional amplitudes on the order of \(10\%\) to \(15\%\)) can be rigorously classified as classically inexplicable, provided macro-scale structural stability (constant \(T_2^*\)) is empirically verified. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.07641 [quant-ph] (or arXiv:2604.07641v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.07641 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission hist
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quantum-computingInverse Laplace and Mellin integral transforms modified for use in quantum communications
--> Quantum Physics arXiv:2604.07787 (quant-ph) [Submitted on 9 Apr 2026] Title:Inverse Laplace and Mellin integral transforms modified for use in quantum communications Authors:Gustavo Alvarez, Igor Kondrashuk View a PDF of the paper titled Inverse Laplace and Mellin integral transforms modified for use in quantum communications, by Gustavo Alvarez and 1 other authors View PDF HTML (experimental) Abstract:Integral transformations are useful mathematical tool to work out signals and wave-packets in electronic devices. They may be used in software protocols. Necessary knowledge may come from quantum field theory, in particular from quantum chromodynamics, in which the optic theorem and the renormalization group equation can be solved by a unique contour integral written in two different "dual" ways related between themselves by a complex map in the complex plane of Mellin variable. The inverse integral transformation should be modified to be applied for these contour integral solutions. These modified inverse transformations may be used in security protocols for quantum computers. Here we do a brief review of the basic integral transforms and propose their modification for the extended domains. Comments: Subjects: Quantum Physics (quant-ph); Mathematical Physics (math-ph) MSC classes: 44A15, 44A20, 81T13, 30E20, 81T60, 44A60, 44A20, 33B15, 44A10, 45K05, 81Q40, 46N50 ACM classes: H.1.1 Cite as: arXiv:2604.07787 [quant-ph] (or arXiv:2604.07787v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.07787 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Igor Kondrashuk [view email] [v1] Thu, 9 Apr 2026 04:29:19 UTC (91 KB) Full-text links: Access Paper: View a PDF of the paper titled Inverse Laplace and Mellin integral transforms modified for use in quantum communications, by Gustavo Alvarez and 1 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph
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quantum-computingIQM Announces First U.S. Quantum Technology Center in the University of Maryland’s Discovery District, Joining the Capital of Quantum Ecosystem - Business Wire
IQM Announces First U.S. Quantum Technology Center in the University of Maryland’s Discovery District, Joining the Capital of Quantum Ecosystem Business Wire
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quantum-computingChaotic Systems Need Fewer Steps to Mimic Random Quantum Behaviour
Chaotic Hamiltonian evolution efficiently mimics truly random quantum dynamics, a key element in both quantum information theory and many-body physics. Yi-Neng Zhou and colleagues at University of Geneva demonstrate that generating unitary $k$-designs does not necessarily require numerous independent Hamiltonians or precise control of evolution times. Their research reveals a new approach utilising a ‘quenched temporal ensemble’, where randomness is introduced through the duration of fixed Hamiltonian applications. Analysis of two-step and three-step protocols shows that while a two-step process falls short of creating a general unitary $k$-design, a three-step protocol successfully achieves this for any value of $k$. This advancement stems from the additional random phases within the three-step process, which impose stronger constraints and improve accuracy even with imperfect time averaging Three-step protocols enable general unitary k-design generation for simplified quantum simulation A three-step protocol (3SP) generates unitary $k$-designs, key tools for quantum simulations, with a parametrically narrower time window than existing two-step protocols (2SP). Previously, achieving these designs demanded either numerous independent Hamiltonian realisations or extremely precise control over evolution times. The 3SP bypasses these requirements by introducing randomness solely through the duration of fixed Hamiltonian applications. Rigorous proof demonstrates that while a 2SP cannot create a general unitary $k$-design, the 3SP successfully achieves this for any value of $k$, representing a strong advancement in simplifying quantum simulations. Unitary $k$-designs are particularly valuable because they provide a sufficient condition for the average behaviour of a quantum circuit to be equivalent to that of a completely random circuit, simplifying the analysis of complex quantum algorithms and many-body systems. The parameter $k$ dictates the order of the design; highe
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quantum-computingMeasurements Can Surprisingly Boost Quantum Entanglement in Certain Materials
Rui-Jing Guo and colleagues at Sun Yat-sen University show that local measurements do not always diminish quantum entanglement, contrary to expectations. Their work on a one-dimensional superconducting chain reveals a competition between pairing and measurement that, under specific conditions, sharply enhances steady-state entanglement. This measurement-enhanced entanglement, where entanglement increases with measurement rate, occurs because stronger measurements counteract the pairing correlations that would otherwise limit entanglement growth. However, the team also found that this effect does not extend to infinitely large systems, with steady-state entanglement scaling as the square of the logarithm of system size. Simulating many-body fermion dynamics via iterative quasiparticle updates Quasiparticle analysis proved central to understanding the observed behaviour, simplifying complex quantum systems by treating groups of particles as single, effective entities, much like viewing a crowd as a single moving form. The approach enabled dissection of the interaction between pairing and measurement within the one-dimensional chain, revealing how each influenced entanglement. Specifically, this allowed modelling of the system’s evolution after each measurement, updating the quasiparticle description to reflect the altered quantum state. This iterative process was essential for accurately capturing the measurement-enhanced entanglement. Efficient simulation of the many-body system’s dynamics was possible by focusing on these quasiparticles, pinpointing the conditions under which measurements unexpectedly boosted entanglement. A one-dimensional chain of spinful fermions governed by a BCS Hamiltonian was investigated, concentrating on the interplay between pairing strength, denoted by Δ, and continuous, on-site measurements occurring at a rate of γ. This method efficiently handles many-body interactions by representing groups of particles as single entities, favoured ove
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Quantonation Selects Yaqumo as Its First Japanese Investment
Insider Brief Tokyo-based Yaqumo raised a seed extension from Quantonation, marking the quantum-focused VC’s first investment in a Japanese startup and signaling growing global interest in Japan’s quantum sector. The funding will support Yaqumo’s development of neutral-atom quantum hardware, including efforts to scale systems, improve error correction through faster clock rates, and advance toward commercialization. Structured as J-KISS convertible equity, the round is intended to bridge the company to a future Series A while enabling team expansion, R&D acceleration, and international partnerships. Yaqumo Inc. (Headquarters: Chiyoda-ku, Tokyo; CEO: Kazuhiro Nakashoji), a startup developing scalable neutral-atom quantum computers, announced today that it has raised a Seed Extension Round from Quantonation II FPCI (“Quantonation”), the world’s largest venture capital fund dedicated to quantum technologies. This milestone marks Quantonation’s first-ever investment in a Japanese company. With this funding, Yaqumo will accelerate its core R&D in neutral-atom quantum hardware, drive the commercialization of its technology, expand its team of world-class scientists and engineers, and forge strategic partnerships with enterprises and research institutions globally — solidifying its position as a key player in the quantum ecosystem. This funding represents an extension of the company’s Seed round, serving as a bridge to accelerate our growth toward a Series A. Quantonation is one of the world’s leading venture capital funds dedicated to quantum computing and quantum technologies. Since its founding in 2018, the firm has deployed over $350 million in assets under management, investing in more than 38 quantum deep-tech startups across 10 countries spanning the US, Europe, and Asia. With a portfolio deliberately designed to catalyze a quantum industry of global scale, Quantonation has now selected Yaqumo as one of its portfolio companies. Website: https://quantonation.
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quantum-computingAccelerating Quantum State Encoding with SIMD: Design, Implementation, and Benchmarking
--> Quantum Physics arXiv:2604.06270 (quant-ph) [Submitted on 7 Apr 2026] Title:Accelerating Quantum State Encoding with SIMD: Design, Implementation, and Benchmarking Authors:Riza Alaudin Syah, Irwan Alnarus Kautsar, Gunawan Witjaksono, Haza Nuzly Bin Abdull Hamed View a PDF of the paper titled Accelerating Quantum State Encoding with SIMD: Design, Implementation, and Benchmarking, by Riza Alaudin Syah and 3 other authors View PDF Abstract:Efficient data encoding is the main factor affecting how fast hybrid quantum-classical algorithms run, but traditional simulators spend most of their time changing classical features into quantum rotations. This work introduces Hybriqu Encoder, a Rust-based, SIMD-aware kernel that focuses exclusively on angle encoding and integrates transparently with Python via CFFI. The kernel processes four double-precision rotations at once using AVX-class vector lanes, combines data in a way that fits well with the cache and uses pre-calculated trigonometric factors, while keeping all unsafe operations within a safe Rust interface. Benchmarks on Apple Silicon show that using pure angle encoding is 5.4% faster at 64 qubits, and the speedup increases as the amount of data exceeds the L1 cache size, while kernels that quickly apply rotations to the entire state vector are limited by memory and do not benefit from SIMD. These results indicate that using vectorization leads to consistent improvements when calculations are the main focus, but limits on data transfer speed prevent additional speed increases, highlighting the need for future efforts on better state updates and choosing between different processing methods. By combining smart optimization that considers the architecture with Rust's safety features, the Hybriqu Encoder offers a flexible base for bigger, mixed systems designed to reduce data encoding delays in future hybrid quantum-classical processes. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.06270 [quant-ph]
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quantum-computingHeterogeneous architectures enable a 138x reduction in physical qubit requirements for fault-tolerant quantum computing under detailed accounting
--> Quantum Physics arXiv:2604.06319 (quant-ph) [Submitted on 7 Apr 2026] Title:Heterogeneous architectures enable a 138x reduction in physical qubit requirements for fault-tolerant quantum computing under detailed accounting Authors:Pranav S. Mundada, Aleksei Khindanov, Yulun Wang, Claire L. Edmunds, Paul Coote, Michael J. Biercuk, Yuval Baum, Michael Hush View a PDF of the paper titled Heterogeneous architectures enable a 138x reduction in physical qubit requirements for fault-tolerant quantum computing under detailed accounting, by Pranav S. Mundada and 7 other authors View PDF Abstract:Quantum computer hardware is predicted to scale over hundreds of thousands of qubits coming online in the next decade. Despite significant theoretical and experimental QEC progress, quantum computer architecture has suffered a significant gap, with bottom-up physical-device-driven challenges largely disconnected from top-down QEC-code-driven considerations. In this work, we unify these two views, presenting a complete heterogeneous quantum computing architecture incorporating task-specific hardware selection and QEC encoding, and agnostic to code selection or physical qubit parameters. Our approach further enables special-purpose processing modules, and includes a full microarchitecture for fault-tolerant implementation of interfaces between quantum processing units and quantum memories. Using this architecture and a new fully featured compiler functioning across subsystems at the scale of $1,000$ logical qubits, we schedule and orchestrate a variety of algorithms down to hardware-specific instructions; a detailed accounting of all operations reveals up to 551x reduction in algorithmic logical error and up to 138x reduction in physical-qubit overhead compared to a monolithic baseline architecture. We then consider the factorization of 2048-bit RSA-integers; using an experimentally demonstrated grid-coupling topology, factoring RSA-2048 requires 381k physical qubits and 9.2 days, w
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quantum-computingProbabilistic and approximate universal quantum purification machines
--> Quantum Physics arXiv:2604.06325 (quant-ph) [Submitted on 7 Apr 2026] Title:Probabilistic and approximate universal quantum purification machines Authors:Zoe G. del Toro, Jessica Bavaresco View a PDF of the paper titled Probabilistic and approximate universal quantum purification machines, by Zoe G. del Toro and 1 other authors View PDF HTML (experimental) Abstract:We study the task of lifting arbitrary quantum states and channels to purifications and Stinespring dilations, respectively, in both the probabilistic exact and deterministic approximate settings. We formalize this task through a general framework of quantum purification machines that, given a finite number of copies or uses of a black-box input, aim to output a corresponding purification or Stinespring dilation. In the probabilistic exact setting, we show that universality is not necessary to rule out such transformations: the simple requirement that a machine purifies two inputs of different rank with non-zero probability already implies that it cannot be described by a linear positive map. This simple argument captures a fundamental obstruction of quantum theory and recovers the impossibility of universal probabilistic purification from finitely many copies. In the approximate setting, we allow for general machines that are not required, in general, to produce a pure output. Using the minimum average error as our figure of merit, we derive analytical expressions for the performance of several physically motivated strategies as well as a general upper bound on the achievable error, which is tight in a specific regime. Our analysis reveals a trade-off: strategies that produce a pure output - among which we prove the optimal to be a strategy that produces as a fixed output a maximally entangled purification of the fully depolarizing channel - perform optimally between those considered for large environment dimension, while append-environment strategies that generally produce non-pure outputs perform b
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quantum-computingAgent Choice via Quantum Flux in Living Systems
--> Quantum Physics arXiv:2604.06450 (quant-ph) [Submitted on 7 Apr 2026] Title:Agent Choice via Quantum Flux in Living Systems Authors:R. E. Kastner View a PDF of the paper titled Agent Choice via Quantum Flux in Living Systems, by R. E. Kastner View PDF Abstract:A basic model is provided that places active, intentional choices by biological organisms on a solid physical footing. The model is provisionally called "Agent Choice via Quantum Flux." It brings to bear specific physics on living systems in a way that allows for intentional choices not pre-determined by physical laws, but remaining consistent with those laws. It does so by exploring a possible many-to-one relation of quantum states to agent choices, with a parallel to the relation of thermodynamic microstates to macrostates. Subjects: Quantum Physics (quant-ph); Biological Physics (physics.bio-ph) Cite as: arXiv:2604.06450 [quant-ph] (or arXiv:2604.06450v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.06450 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: R. E. Kastner [view email] [v1] Tue, 7 Apr 2026 20:46:12 UTC (108 KB) Full-text links: Access Paper: View a PDF of the paper titled Agent Choice via Quantum Flux in Living Systems, by R. E. KastnerView PDF view license Current browse context: quant-ph < prev | next > new | recent | 2026-04 Change to browse by: physics physics.bio-ph References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Me
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quantum-computingDissipative Hamilton Jacobi Dynamics and the Emergence of Quantum Wave Mechanics
--> Quantum Physics arXiv:2604.06455 (quant-ph) [Submitted on 7 Apr 2026] Title:Dissipative Hamilton Jacobi Dynamics and the Emergence of Quantum Wave Mechanics Authors:Naleli Jubert Matjelo View a PDF of the paper titled Dissipative Hamilton Jacobi Dynamics and the Emergence of Quantum Wave Mechanics, by Naleli Jubert Matjelo View PDF HTML (experimental) Abstract:We develop a dissipative extension of classical mechanics based on a complex, and more generally quaternionic, action principle that endows every classical system with an intrinsic environment. Decomposing the action into conservative and divergence-induced components yields two coupled Hamilton Jacobi equations describing a dynamically intertwined system environment pair. This motivates a Dual Sector or Dual Environmental Interpretation (DSI/DEI), in which the additional degrees of freedom behave as an image sector exchanging energy, information, and phase with the system. Applying a generalized Madelung transform produces a nonlinear dissipative wave equation whose symmetric equilibrium limit reduces to the Schroedinger equation, with the quantum potential and linearity emerging from balanced intersector coupling. In this framework, the wavefunction is not fundamental but encodes the interaction geometry between system and environment, providing a classical origin for interference, amplitude phase coupling, and probabilistic structure. Extending the imaginary structure to multiple independent directions yields a multienvironment generalization capable of representing measurement-like processes, nonMarkovian memory, and entanglement type correlations. The formulation unifies aspects of dual-system models, hydrodynamic approaches, and non-Hermitian dynamics within a single action-based framework, and suggests that quantum mechanics corresponds to a stable symmetric phase of a broader dissipative classical theory. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.06455 [quant-ph] (or
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quantum-computingOne-to-one correspondence between Hierarchical Equations of Motion and Pseudomodes for Open Quantum System Dynamics
--> Quantum Physics arXiv:2604.06466 (quant-ph) [Submitted on 7 Apr 2026] Title:One-to-one correspondence between Hierarchical Equations of Motion and Pseudomodes for Open Quantum System Dynamics Authors:Kai Müller, Walter T. Strunz View a PDF of the paper titled One-to-one correspondence between Hierarchical Equations of Motion and Pseudomodes for Open Quantum System Dynamics, by Kai M\"uller and Walter T. Strunz View PDF HTML (experimental) Abstract:We unite two of the most widely used approaches for strongly damped, non-Markovian open quantum dynamics, the Hierarchical Equations of Motion (HEOM) and the pseudomode method by proving two statements: First, every physical bath correlation function (BCF) that can be written as a sum of $N$ exponential terms can be obtained from a physical model with $N$ interacting pseudomodes which are damped in Lindblad form. Second, for every such BCF there exists a non-unitary, linear transformation which mirrors the evolution of the system-pseudomode state onto the HEOM hierarchy, and vice versa. Our proofs are constructive and we give explicit expressions for the mirror transformation as well as for the pseudomode Lindbladian corresponding to a given exponential BCF. This approach also gives insight and provides elegant derivations of the corresponding Hierarchy of stochastic Pure States (HOPS) method and its nearly-unitary version, nuHOPS. Our result opens several avenues for further optimization of non-Markovian open quantum system dynamics methods. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.06466 [quant-ph] (or arXiv:2604.06466v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.06466 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Kai Müller [view email] [v1] Tue, 7 Apr 2026 21:08:53 UTC (120 KB) Full-text links: Access Paper: View a PDF of the paper titled One-to-one correspondence between Hierarchical Equations of Motion and Pseud
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quantum-computingDiscrete-variable assisted error correction of continuous-variable quantum information
--> Quantum Physics arXiv:2604.06565 (quant-ph) [Submitted on 8 Apr 2026] Title:Discrete-variable assisted error correction of continuous-variable quantum information Authors:Negin Razian, En-Jui Chang, Hoi-Kwan Lau View a PDF of the paper titled Discrete-variable assisted error correction of continuous-variable quantum information, by Negin Razian and 2 other authors View PDF HTML (experimental) Abstract:Robust continuous-variable (CV) quantum information processing requires correcting realistic errors in bosonic systems, but all existing schemes rely on auxiliary Gottesman-Kitaev-Preskill (GKP) states which the preparation and operation are demanding in many platforms. In this work, we propose a novel CV quantum error correction (QEC) scheme that utilizes a broadly accessible resource: discrete-variable (DV) ancilla. Our scheme extracts information about CV displacement to the DV ancilla, measuring that allows counteracting the unwanted displacement error. We show that a simple single-qubit ancilla can already suppress CV infidelity by more than 20%. By concatenating with DV QEC codes, our scheme is robust against the physical errors in hybrid CV-DV systems, and yields a new class of oscillator-in-oscillator code that does not involve GKP states. Our work facilitates the implementation of CV QEC on realistic platforms. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.06565 [quant-ph] (or arXiv:2604.06565v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.06565 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Hoi-Kwan Lau [view email] [v1] Wed, 8 Apr 2026 01:28:54 UTC (2,110 KB) Full-text links: Access Paper: View a PDF of the paper titled Discrete-variable assisted error correction of continuous-variable quantum information, by Negin Razian and 2 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev | next&n
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quantum-computingQDG Summit: 13 Nations Boost Secure Quantum Technology
Delegates from thirteen nations convened in London to solidify international collaboration on secure quantum technology development, following a summit hosted by the United Kingdom. The fifth meeting of the Quantum Development Group (QDG), comprised of countries including Australia, Canada, France, Germany, and the United States, focused on bolstering research security, investment, and supply chain resilience for this rapidly advancing field. Members agreed to deepen cooperation across these three priority areas to support trusted international collaboration and the safe development of quantum technology. “Quantum has the potential to be one of the most exciting and defining technologies of the coming years,” said Science and Technology Secretary Liz Kendall, “with the power to transform healthcare, energy, defence and transport, its impact will touch all of our lives.” This QDG meeting follows the UK government’s commitment of £2 billion to quantum technologies on March 17th, and a new procurement program, signaling a strong intent to drive innovation and deployment. Thirteen Nations Convene Within Quantum Development Group (QDG) The convergence of thirteen nations within the Quantum Development Group (QDG) signals a heightened focus on securing international leadership in a technology expected to redefine multiple sectors. Convening in London from March 30th to April 1st, representatives from Australia, Canada, Denmark, Finland, France, Germany, Japan, Korea, the Netherlands, Sweden, Switzerland, the UK, and the US collectively reinforced their dedication to the responsible and economically beneficial advancement of quantum technologies. The QDG’s discussions centered on three key areas intended to accelerate progress and mitigate risks: research security, investment security, and supply chain resilience were identified as crucial for fostering trustworthy international collaboration. Members agreed to prioritize deeper engagement between governments and investors
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quantum-computingAI Drafting Tools Need Human Oversight to Ensure Physics Remains Sound
Yi Zhou and colleagues at the Chinese Academy of Sciences, Beijing are investigating the challenges presented by large language models becoming active participants in the writing process. A case study of a computational physics manuscript highlights the key need for continued Human-in-the-Loop (HITL) oversight. AI can assist with organisation and language, but human researchers must retain responsibility for ensuring physical accuracy, addressing potential criticisms, and upholding academic standards. Zhou argues for the mandatory publication of complete AI interaction logs as supplementary material to promote transparency and accountability in this changing landscape. Automated code generation from theoretical physics using a distributed Large Language Model system A multi-stage workflow, utilising a “Virtual Research Group” of Large Language Models (LLMs), proved key to accelerating the drafting process. These sophisticated autocomplete systems generate text based on patterns learned from vast amounts of data, typically encompassing billions of parameters and trained on extensive corpora of text and code. The underlying architecture of these LLMs often relies on the Transformer network, enabling parallel processing of input sequences and capturing long-range dependencies crucial for coherent text generation. The system assigned distinct roles to each LLM, mirroring a research team with specialists in theory, postdoctoral research, and coding. Consequently, it translated a complex physics review, detailing advanced concepts in tensor networks and quantum field theory, into functional Python code, a process previously demanding months of effort from graduate students. This code was designed for simulating complex physical systems, allowing for numerical verification of theoretical predictions. Careful management was necessary to ensure coherence and accuracy during this rapid iteration and increase in efficiency. The approach leveraged AI’s strengths in organisation
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quantum-computingEqual1 and Q-CTRL Partner on Autonomous Quantum Systems
Insider Brief Equal1 and Q-CTRL have partnered to integrate autonomous calibration software into silicon-based quantum systems for data center deployment. The integration enables automated tuning, real-time performance management, and secure local operation without requiring constant expert intervention. The collaboration aims to make quantum computers more scalable and compatible with existing enterprise infrastructure like CPUs and GPUs. PRESS RELEASE — Equal1, a leader in silicon-based quantum computing, and Q-CTRL, the global leader in quantum infrastructure software, today announced a first-of-its-kind strategic partnership to integrate Q-CTRL’s infrastructure software for autonomous calibration into Equal1’s Silicon quantum computers, powering the mass deployment of rack-mount quantum computers into enterprise data centers. As enterprise interest in quantum computing accelerates, improvements in system performance and automation are needed to ensure delivery keeps pace with demand. A primary barrier to broad adoption is the complexity of “booting up” and maintaining quantum hardware, a process typically handled manually by teams of PhD-level experts. When considering quantum computers sitting alongside GPUs and CPUs at scale, this prospect poses an exceptionally difficult challenge. Now, by integrating Q-CTRL’s Boulder Opal Scale Up into deployable Equal1 quantum computers, users can experience truly autonomous operation, maintaining peak performance without manual oversight. “Equal1 has already proven that quantum hardware can be compact, rack-mounted, and data-center ready,” said Jason Lynch, CEO of Equal1. “Our partnership with Q-CTRL further accelerates our mission by providing a fully autonomous software stack. With Boulder Opal Scale Up integrated into our Bell-series systems, our customers gain a self-optimizing quantum accelerator that fits seamlessly into existing IT infrastructure.” Q-CTRL has pioneered the concept of quantum containeriza
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