September 22, 2026

Anomalously enhanced lifetimes of low angular momentum Rydberg states in singly charged alkaline-earth metal ionsTier 3

Trapped ions excited to high-lying electronic states, so-called Rydberg states, open new opportunities for quantum simulation and quantum computing. Generally, the fidelity of quantum coherent operations critically depends on the longevity of Rydberg states. However, scaling laws predict that the lifetimes of Rydberg states in singly charged alkaline-earth metal ions are 16...

Efficient Heralding of Loss-Tolerant Photonic GHZ States for Device-Independent Conference Key Agreement over Long DistancesTier 3

Heralded multipartite entanglement distribution is a key requirement for device-independent conference key agreement (DI-CKA) over lossy quantum networks. Although locally equivalent in the absence of loss, different single-rail photon-number encodings of Greenberger-Horne-Zeilinger (GHZ) states can exhibit substantially different loss tolerance. We show that computational-b...

New Sandpit Program Targets Quantum Silicon Photonics PlatformsTier 2

Insider Brief PRESS RELEASE — – CORNERSTONE, the silicon photonics foundry at the University of Southampton, today announces the opening of applications for its Photonics Innovation Centre (C-PIC) Future Leaders programme, which will take place from 12-14 January 2027 at Ada Lovelace’s former home, the De Vere Horsley...

Collective cavity quantum electrodynamics in solid-state optical clocksTier 3

Solid-state frequency standards are generally limited by strong decoherence, rendering conventional interrogation schemes inefficient. The ^(229)Th nuclear clock provides a unique and timely platform for solid-state optical metrology and nuclear cavity quantum electrodynamics (QED), featuring a coherence time many orders of magnitude shorter than the radiative lifetime in...

Superconducting qubit based on altermagnetsTier 3

Altermagnets, characterized by vanishing net magnetization and momentum-dependent spin splitting, provide a promising platform for next-generation Josephson devices. Here, we exploit the Josephson effect in superconductor-altermagnet-superconductor junctions and show how to engineer prescribed current-phase relations by device design. Based on these programmable Josephson po...

The Superconducting Talbot Effect in Phased-Array Josephson JunctionsTier 3

We introduce the superconducting Talbot effect---a macroscopic quantum self-imaging phenomenon occurring when proximitized Cooper pairs propagate through a ballistic two-dimensional electron gas. By configuring periodic superconducting leads into a phased-array Josephson junction with programmable phase differences, we demonstrate active steering of the resulting superconduc...

Versatile Quantum Machine Learning with an Ultra-low Power Photonic Quantum Reservoir ComputerTier 3

Integrated photonic microprocessors provide high-bandwidth, massively parallel linear computation, but realizing nonlinear feature maps and temporal memory remain key challenges for machine learning. Conventional approaches rely on active tuning and additional nonlinear elements, increasing architectural complexity and power overhead. Here we demonstrate an integrated photon...

Reconstructing the phonon distribution of trapped ions out of the Lamb-Dicke regimeTier 3

Characterizing the phonon distribution of trapped-ion motional states is essential for many applications in quantum information processing, but existing methods become ill-conditioned beyond the Lamb-Dicke regime. We overcome this limitation by recasting phonon-state reconstruction as a filter-function inversion problem. Using composite pulses on the carrier and multiple sid...

Observable-targeted variational quantum simulation of Hamiltonian dynamicsTier 3

Standard variational quantum simulation seeks to reproduce the evolution of the full quantum state, although many applications require only the expectation values of a few observables. We study a variational method for pure-state Hamiltonian dynamics that updates circuit parameters to reproduce the evolution of selected expectation values. An exact error identity guides the...

Experimental evidence of generalization in quantum machine learning in small-data regimeTier 3

Quantum machine learning is a promising paradigm for learning from limited data, a central bottleneck in domains such as medical imaging, clinical trials, and rare diseases. Quantum convolutional neural networks (QCNNs) are particularly attractive in this setting, combining a hierarchical architecture with strong inductive bias and a parameter count that grows only logarithm...

An Exact Operator Formulation of Statistical Quasiparticle Theory for Nonlinear System-Bath CouplingTier 3

We develop an operator formulation of statistical quasiparticle theory for open quantum systems with nonlinear system-bath coupling, extending beyond the linear coupling setting of the standard Gaussian influence functional formulation. For Gaussian baths, the statistical quasiparticles, termed dissipatons, are explicitly constructed as collective operators in the thermofiel...

Subspace Controllability in Variational Quantum Circuits: Maximising Expressivity and Increasing Search Efficiency with Dynamical Lie AlgebrasTier 3

Variational hybrid quantum models are a common paradigm for realising machine learning on quantum hardware. Nonetheless, they are challenging to train due to several problems intrinsic to the loss landscapes formed by variational quantum circuits. To mitigate these issues, researchers have extended the idea of subspace controllability leading to an increase in the success ra...

Quantum Computing Solution of the Bethe-Salpeter Equation for Relativistic Scalar Bound States via Tensor-Network VQETier 3

We present a gate-based quantum computing solution of the homogeneous Bethe-Salpeter equation (hBSE) for the bound state of two massive relativistic scalar particles interacting via ladder-approximation scalar exchange. After Wick rotation to Euclidean space and O(4) S-wave partial-wave projection, the hBSE is reduced to a symmetric matrix eigenvalue problem of dimension N =...

QNu Labs Launches QShield 2.0 to Drive India’s National Cryptographic Assessment & Assurance FrameworkTier 2

QNu Labs has launched QShield 2.0, a sovereign, full-stack post-quantum cryptography (PQC) and crypto-agility platform, to drive India’s National Cryptographic Assessment & Assurance Framework (NCAAF). The platform, introduced at the company’s 10th anniversary, helps critical infrastructure sectors initiate formal PQC migration by 2027, as mandated by the National Qua...

Pendellösung length-scale neutron and X-ray interferometryTier 3

Neutron and X-ray perfect-crystal interferometers (PCIs) are powerful platforms for studies of fundamental physics and phase-contrast imaging. Further enhancing several PCI capabilities requires reducing crystal blade thickness to the micron scale, which minimizes dynamical-diffraction image blur, permits operation in the pendellösung regime where blade thickness controls be...

Benchmarking higher-ranking multipoles and polarizability tensors for small molecular systemsTier 3

Molecular properties govern how molecules interact with one another or external fields. Accurate molecular properties are essential for constructing intermolecular interaction models, and to achieve high accuracy we need to go beyond leading-order (dipolar) terms. This work presents CCSD(T) references for 73 small non-spin-polarized molecules for molecular dipole and quadrup...

On the dual character of Zn impurity in SnTe: Tuning thermoelectric and topological propertiesTier 3

We present a first-principles study of the electronic structure and thermoelectric properties of Zn-doped SnTe using the Korringa-Kohn-Rostoker method within the coherent potential approximation, complemented by pseudopotential calculations. SnTe is a lead-free analogue of PbTe and a candidate thermoelectric material in which Zn doping has been experimentally reported to enh...

Trade-offs and experimental feasibility of nonlocal polygamy with two-outcome Bell inequalitiesTier 3

Entanglement and Bell nonlocality have different sharing constraints across subsystems of a multipartite quantum system. We examine simultaneous violations of Bell inequalities with two-outcome observables and two or three measurement settings per party. We identify configurations whose simultaneous violations can be demonstrated on IBM Quantum hardware, and derive bounds an...

Chulalongkorn University and AIST (G-QuAT) Sign Five-Year Memorandum of Understanding to Build Bilateral Quantum Technology EcosystemTier 2

Chulalongkorn University (Thailand) and Japan's National Institute of Advanced Industrial Science and Technology (AIST) have signed a five-year MoU to advance quantum technology in Southeast Asia. This partnership will focus on joint research, scientific exchange, and developing quantum computing applications. The collaboration aims to address workforce shortages and esta...

Phasecraft Establishes U.S. Headquarters in Arlington, Virginia to Accelerate Government and Defense Quantum Software PartnershipsTier 2

Phasecraft established its U.S. headquarters in Arlington, Virginia, supported by VEDP and VJIP, to expand its quantum software partnerships and workforce. This move aims to accelerate algorithm development across federal defense, energy, and commercial sectors, building on existing engagements with DARPA and ARPA-E.

IonQ and SDT Partner on Quantum Computing and Manufacturing in South KoreaTier 2

Insider Brief PRESS RELEASE — IonQ (NYSE: IONQ), the world’s leading full-stack quantum platform and foundry, today announced a strategic partnership with Korea-based quantum technology and software company SDT, Inc. Under this multi-year collaboration IonQ will supply SDT with a Superion 256 quantum computer as well as IonQ’s silicon-vacancy (SiV) quantum memory modul...

Previously: 2026-09-19, 2026-09-09

Intel CEO Sees Quantum Computing Working Alongside CPUs and GPUsTier 2

Insider Brief Intel Chief Executive Lip-Bu Tan said quantum computers are likely to work alongside conventional processors rather than replace them, as the industry searches for commercially useful applications. “In my view, GPUs, CPUs and quantum computing are all forms of computing, so they will run together in certain application areas, and you will be […]

Overcoming the Hong-Ou-Mandel interference limitation for the second photon from a two-photon cascadeTier 3

Quantum emitters such as semiconductor quantum dots can provide entangled photon pairs emitting from a system of cascaded states. However, the resulting temporal correlation between the two photons from the three-level ladder system has been shown to set a limit on the achievable two-photon interference. In this work, we show that such limitation, for photons emitted by the...

A Reconfigurable Multilayer Quantum Key Distribution Network over Existing Metropolitan FibreTier 3

Scaling quantum networks requires architectures extending end-to-end service reachability despite constrained fibre and equipment. Critically, in brownfield deployments, the quantum network must be engineered around classical telecommunications infrastructure and the operating capabilities of quantum key distribution (QKD) technology. To address this, we demonstrate a seven-...

Toward Scalable Quantum Networks: An Efficient And Practical Approach to Secure Quantum ConferencingTier 2

Insider Brief PRESS RELEASE — Quantum key distribution allows two users to establish secret keys whose security is grounded in the laws of quantum mechanics. Extending this capability to multiple users is an essential step toward quantum networks that support secure communication among many participants. Quantum cryptographic conferencing addresses this need by enablin...

Quantum Mpemba effect from Stark localizationTier 3

In classical systems, rugged potential energy landscapes provide a transparent mechanism for the celebrated Mpemba effect, in which hotter initial states cool down faster. This picture generally does not survive in quantum systems. Here we show how to design a quantum energy landscape with local dissipation leading to an Mpemba effect with parametrically separated timescales...

Tight entropy contraction beyond detailed balanceTier 3

We establish quantitative entropy contraction bounds for finite-dimensional quantum channels beyond detailed balance. For channels compatible with a faithful conditional expectation, we show that GNS (Gelfand--Naimark--Segal) norm contraction yields relative entropy contraction with only a logarithmic loss in the dimensional constant. For quantum Markov semigroups with a fai...

Fisher-information training of optical sensing front ends from natural fluctuationsTier 3

Fisher-information-based optimization of programmable optical front ends in situ generally requires a response model or parameter-labeled measurements. We show that natural parameter fluctuations can instead provide the training signal. We construct proxies for the Fisher information (FI) of one parameter and the prior-weighted FI spectrum of multiple parameters from measure...

Explanation of the Observed Energy Exchange through the vacuum in OptomechanicsTier 3

In cavity optomechanics, the standard large-detuning regime is commonly described by retaining only the radiation-pressure interaction, while higher-order mirror--field interactions are assumed to be negligible. This approximation, however, fails to provide a microscopic explanation for the vacuum-mediated heat transfer observed between the mechanical membranes in the experi...

Stabilizing temporal quantum-enhanced sensitivity via sub-optimal measurementsTier 3

In non-equilibrium probes, quantum-enhanced sensitivity is quantified through super-linear scaling of precision with respect to time, as a central metrology resource. However, this requires optimal measurements, which are often complex and time-dependent, making it challenging in practice. Sub-optimal measurements typically fail to retain robust super-linear scaling and show...

Unified spatiotemporal quantum states and spatiotemporal entanglement from Kirkwood-Dirac phase spaceTier 3

The notion of a spatiotemporal quantum state extends the conventional concept of a spatial quantum state to the spatiotemporal domain. Such states are represented by unit-trace operators that encode correlations among quantum events distributed across space and time. In this work, we use the spatiotemporal Kirkwood-Dirac phase space to provide a unified characterization of s...

Wigner-positive quantum states can have lower entropy than the vacuumTier 3

The Wigner entropy conjecture posits that pure Gaussian states minimize the Shannon entropy of non-negative Wigner functions, known as the Wigner entropy. We show that mixing a specific pure Wigner-negative state with another suitably chosen quantum state can restore Wigner positivity while retaining a Wigner entropy that is slightly - but strictly - below the vacuum entropy...

Explicit closed-form propagators for time-dependent gain-loss master equationsTier 3

Time ordering is a central obstacle in driven open-system dynamics governed by master equations with time-dependent rates. We derive explicit closed-form factorizations of the chronological and antichronological propagators for a time-dependent generator of the form L(t)=α(t)A+β(t)B, when the commutator [A,B] is a simultaneous eigenoperator of the adjoint actio...

Random-matrix and transport frequencies in eigenstate spectral functionsTier 3

The fact that generic isolated many-body quantum systems thermalize is understood using the eigenstate thermalization hypothesis (ETH). In recent years, there has been much interest in the behavior of the ETH spectral functions, which characterize the smooth dependence of the variance of the off-diagonal matrix elements of observables on the associated energy and frequency,...

Collective advantage from a minimal record in a quantum information engineTier 3

For a single particle, a quantum information engine can turn measurement fluctuations into transport by raising a barrier behind the particle each time its position is measured. When many particles are present, the barrier still depends on just one number, the position of the leftmost particle, so we let the demon measure that order statistic and nothing else. A demon that r...

Statistical mechanics of multipartite entanglement in hypergraph statesTier 3

We investigate multipartite entanglement in a particular family of pure n-qubit hypergraph states through a statistical-mechanics framework, where the average bipartite purity maps onto an effective Hamiltonian of 2^n classical binary spins. In this correspondence, each hypergraph state uniquely corresponds to a classical spin configuration, while temperature serves as a...

Do gravitational waves assist the genuine tripartite entanglement harvesting?Tier 3

We investigate the harvesting of genuine tripartite entanglement by three linearly arranged Unruh-DeWitt detectors locally coupled to a massless scalar field in a gravitational wave background. We show that gravitational waves play a dual role in entanglement harvesting, either enhancing or suppressing the harvested entanglement depending on the system parameters. In particu...

Quantum Work Extraction via Conditional Spatial DisplacementsTier 3

We propose a protocol for extracting work from a coherent quantum battery state by exploiting measurement-assisted feedback mediated by a continuous-variable pointer. The scheme relies on the unitary operator U = exp(-i k t H ⊗P/ℏ), which generates entanglement between the battery's energy eigenstates and the position of an auxiliary pointer. A s...

Robust self-testing of nonmaximal entanglement from a reduced inner product gameTier 3

We reduce Lalonde's pseudo-telepathy inner product game from six to five dimensions, keeping its four Alice questions and three Bob questions and reducing each answer alphabet to five. We prove that the reduced game self-tests its nonmaximally entangled state and all 35 measurement effects. The self-test is also robust: for a strategy winning with probability at least 1-va...

A Sharp Noise Threshold for Shor's Quantum Factoring and Discrete Log AlgorithmsTier 3

We study the asymptotic behavior of Shor's quantum factoring and discrete log algorithms when noise affects the precise controlled rotation gates in their quantum Fourier transforms. Improving the results of Cai (2024) and Cai and Young (2025), we identify a sharp and vanishingly small noise threshold. If the noise level lies below this threshold, then the two algorithms suc...

Vacancy aggregation enhances NV- spin coherence in diamond: a cluster-correlation-expansion study of multi-vacancy spin baths in semiconductorsTier 3

Annealing a semiconductor makes its vacancies mobile; they aggregate into multi-vacancy complexes that often carry spin. Such centres are a magnetic-noise source for any spin qubit among them, in silicon and silicon carbide as well as in diamond, and they are accordingly blamed for NV- decoherence in irradiated and implanted diamond, with two coherence records credited to re...

New lower bounds for CDS and f-routingTier 3

Understanding the entanglement cost of non-local quantum computation (NLQC) is relevant to complexity theory, cryptography, quantum gravity, and related areas. A central special case is f-routing, motivated in part by quantum position verification. Proving lower bounds on its entanglement cost in the fully robust setting has been a major open problem in NLQC. Motivated by...

Quantum many-body framework for passive-scalar turbulenceTier 3

How spatial structures manifest in multi-time correlations is a fundamental question in turbulence. We develop a non-Hermitian bosonic framework that unifies equal-time anomalous statistics and their temporal propagation within a common operator representation. A continuous Wegner flow reorganizes stochastic mode couplings in an extended wave-frequency space. Applied to the...

Electronic-Entropy-Driven Phase Transitions in Compressed Iron OxidesTier 3

Electronic entropy is usually treated as a secondary correction to structural stability, but under strong electronic excitation it can become a primary thermodynamic driving force. Here we show that electronic entropy can drive both polymorphic and stoichiometric phase transformations in compressed iron oxides. Using finite-temperature density functional theory, we calculate...

On the Born rule in a new quantum approachTier 3

In the context of a new approach towards quantum foundation, the Born rule is proved under a weak condition through several steps. The sole weak condition behind the Born rule is called the transition probability principle, which is closely related to the likelihood principle of statistics. This condition is discussed from several points of view. The whole approach leads to...

A QSVT-Based Quantum Jacobi Algorithm for Linear Systems with Application to the Poisson EquationTier 3

Many computational fluid dynamics (CFD) algorithms solve partial differential equations by discretization, resulting in large and sparse systems of linear equations. While iterative methods are widely used to solve these systems classically, most existing quantum linear system solvers target the solution through matrix inversion rather than approximating it using an iterativ...

Thermal Evolution and Disorder Dependence of the Bose-glass: Spatial, Spectral, and Localization SignaturesTier 3

In this work, we characterize the glassy character of the Bose-glass phase in a disordered Bose-Hubbard model using three complementary diagnostics: the finite-temperature spectral function, spatial inhomogeneity, and the inverse participation ratio. Spectral analysis, obtained from finite-temperature Green's function and random phase approximation, shows that disorder intro...

Fault-Class-Matched Test Oracles for Output-Invisible Quantum Transpiler RegressionsTier 3

Test oracles for quantum transpilers typically judge correctness by comparing compiled output against a reference: a statevector, a sampled distribution, or a unitary compared modulo global phase. A companion empirical study measures how often that choice fails. Roughly 28% of merged Qiskit transpiler bug-fixes (95% Wilson CI 19-40%) repair a fault that corrupts layout metad...

Universal Dynamics of a Spin-3/2 Fermi Gas in Traps with Distinct SpectraTier 3

Universal power-law decay of spin-mixing oscillations has been observed in a harmonically trapped spin-3/2 Fermi gas, whose exactly equally spaced spectrum represents a highly special case. To gain insight into the origin of this behavior, we investigate the dynamics in traps with increasing and decreasing level spacings, represented by the infinite square well and the Pös...

No violation on a generalisation of Leggett-Garg inequality and Bell-CHSH inequality with extended probabilityTier 3

A generalisation of the Leggett-Garg inequality (LGI) and the Bell-CHSH inequality is proposed in this work, by replacing a classical probability notion with an extended probability notion. The extended probability serves as an underlying layer of reality to the classical probability. Within the consistent history framework, the underlying layer is so-called a non-settleable...

A complete characterization of eventually entanglement breaking unital quantum channelsTier 3

We obtain a complete characterization of eventually entanglement breaking (EEB) unital channels in terms of some simple commutation properties of their eigenvectors. Specifically, the following properties are equivalent for a unital channel: (i) it is EEB; (ii) it is eventually positive partial transpose (PPT); (iii) it is eventually mixed twisted dephasing; and (iv) its eig...

Chulalongkorn University and Qunova Computing Execute MoU to Advance Hybrid Quantum Algorithms for Industrial R&DTier 2

Chulalongkorn University and Qunova Computing have partnered to advance hybrid quantum algorithms for industrial R&D in Thailand. This collaboration, coordinated by Siam Quantum Square, focuses on applying quantum-classical algorithms to chemistry, material science, fluid dynamics, and financial modeling. The initiative aims to accelerate regional quantum adoption and...

Chulalongkorn University and Qunova Computing Sign Quantum Computing MoUTier 2

Insider Brief PRESS RELEASE — Chulalongkorn University has signed a three-year Memorandum of Understanding (MoU) with Qunova Computing Inc. of the Republic of Korea to establish collaboration in quantum computing research and its practical applications. The agreement was signed by Prof. Dr. Wilert Puriwat, President of Chulalongkorn University, and Dr. Jaewan Kim...

IEEE-Presented Study Tests Quantum-to-Classical Handoff for Distributed ComputingTier 2

Insider Brief PRESS RELEASE — A study presented at IEEE proposes a way to test whether results from quantum processors remain recognizable and useful as they move into the conventional computing systems that would coordinate future distributed quantum computers. The research, led by Frank Angelo Drew, of Quantum Midi Posse, combines a 96-active-qubit hardware benchmark...

Phasecraft to Establish U.S. Headquarters in Arlington, VirginiaTier 2

Insider Brief PRESS RELEASE — Governor Abigail Spanberger today announced that Phasecraft — a leading quantum algorithms company — plans to create 19 new jobs through a $113,000 investment in Arlington County. Founded by researchers from the United Kingdom’s quantum science community, Phasecraft develops algorithms for quantum computers. Their solutions have applicatio...

Measuring correlations using local and nonlocal quenchesTier 3

We present a theoretical proposal for measuring correlation functions in a quantum field system based on the use of quantum quenches. Using the examples of massive and massless scalar field theories, we show that a short-term perturbation of the system leads to a dependence of the further evolution of the average field on the initial state's correlation functions. Considerin...

SEALSQ, WISeKey, and Canton of Jura Execute MoU for CHF 40–60M (48.7M–73M USD) Post-Quantum Semiconductor Personalization HubTier 2

SEALSQ, WISeKey, and the Canton of Jura have partnered to create a CHF 40-60 million (48.7M–73M USD) Post-Quantum Semiconductor Personalization Hub in Switzerland. This center will focus on developing and implementing post-quantum cryptography using SEALSQ’s QS7001 Quantum Shield technology, serving defense, aerospace, and critical infrastructure sectors. The project ai...

Chulalongkorn University and AIST Sign MoU on Quantum TechnologyTier 2

Insider Brief PRESS RELEASE — Chulalongkorn University and the National Institute of Advanced Industrial Science and Technology (AIST) in Japan, through the Global Research and Development Center for Business by Quantum-AI Technology (G-QuAT), signed a memorandum of understanding to drive collaboration in quantum technology and the development of quantum ecosystems bet...