September 4, 2026

Quantum Motion Raises Additional Funding for Silicon Quantum ComputingTier 2

Frequency-Multiplexed Parallel Gates for Quantum LDPC Codes in a Two-Dimensional Ion CrystalTier 3

Quantum low-density parity-check (qLDPC) codes admit high encoding rates but require nonlocal entangling gates for syndrome measurement. Instead of physically moving the qubits which slows down with the increasing qubit number, here we propose to achieve parallel nonlocal entangling gates on a two-dimensional (2D) ion crystal using frequency-multiplexing. Adiabatic condition...

Algebraic Operator Decomposition: A Partitioned Architecture for Noise-Resilient Quantum ComputingTier 3

We present an operator-decomposition architecture that mathematically maps a global operator into independently executable local operators, reducing the maximum quantum circuit depth at the cost of classical reconstruction and sampling overhead. By framing complex Quantum Circuits around an operator in a vector space that can be algebraically pre-decomposed, AOD complements...

Energetic Costs of Subspace Quantum Error CorrectionTier 3

Quantum error correction acts as an entropy pump, transferring noise-induced uncertainty from a protected quantum system into syndrome information stored in an auxiliary memory. Repeated operation requires this memory to be cleared which unavoidably contributes to the energetic cost of error correction. Here, we characterise this contribution for subspace quantum error-corre...

Fractalizing spacetime: Floquet codes with fractonic excitations that are immobile in space and timeTier 3

We generalize fractalization, a procedure for the construction of fracton models, from space to spacetime. We apply spacetime fractalization to construct fracton floquet codes with syndrome excitations that have limited mobility in space and time. This extends the notion of fracton order to intrinsically dynamical quantum phases of matter that are inequivalent to static frac...

Low-Frequency Charge Noise in Bilayer Graphene Quantum DotsTier 3

Bilayer graphene (BLG) quantum dots (QDs) are a promising platform for semiconductor qubits. However, the low-frequency charge noise that may ultimately limit coherence has remained largely unexplored. Here, we systematically characterize charge noise in gate-defined BLG QDs using transport-based noise spectroscopy. We extract a median amplitude of S_μ^(1/2) (1 Hz)...

Pulse-Controlled Topologically Protected Quantum BatteriesTier 3

Quantum batteries have emerged as a promising new generation of energy-storage devices for powering quantum technologies. Long-distance charging is particularly attractive because it minimizes interference between the charger and the battery, thereby attracting considerable interest. Here, we propose a topologically protected long-distance charging protocol for quantum batte...

Quantinuum and Aramco Sign MOU to Explore Industrial Quantum ComputingTier 2

Previously: 2026-06-19

Quantum Hamiltonian Evolution for Coherent Quantum LearningTier 3

We introduce Coherent Quantum Learning (CQL), a training framework for quantum learning models in which the model parameters are quantum degrees of freedom evolved under a Hamiltonian that encodes the loss function. Current quantum machine learning retains classical optimization: parameters are updated by a classical outer loop using gradient estimates from measurements, and...

Projected Riemannian Gradient Descent for the Bures-Wasserstein Barycenter: Dimension-Independent Linear Convergence at Unit Step SizeTier 3

The computation of the Bures-Wasserstein (BW) barycenter of an ensemble of positive definite matrices arises throughout machine learning, optimal transport, and quantum information. Riemannian gradient descent (RGD) at unit step size -- the fixed-point iteration used in practice -- converges rapidly, yet existing analyses present a dichotomy: unit-step guarantees carry worst...

Giesecke+Devrient Joins European uPQComing Consortium to Develop Quantum-Safe eID Operating SystemsTier 2

Munich-based security technology group Giesecke+Devrient (G+D) has joined uPQComing (Enhancing Cyber-Resilience for the Upcoming Post-Quantum Era), a European research consortium co-funded by the European Union's Chips Joint Undertaking (Chips JU). The project focuses on migrating critical public digital infrastructure and resource-constrained embedded secure elements—spe...

SEALSQ Integrates wolfTPM Support into Post-Quantum Silicon Semiconductor Platform (QVault TPM)Tier 2

Post-quantum semiconductor hardware vendor SEALSQ Corp (NASDAQ: LAES) and embedded cryptography developer wolfSSL Inc. have announced native wolfTPM software support for SEALSQ’s QVault TPM hardware security chip. Designed to implement post-quantum cryptography (PQC) primitives in silicon under the Trusted Computing Group’s (TCG) TPM 2.0 v1.85 specification, the integrati...

IBM Releases Nighthawk r2 QPU Featuring Active Dissipative Qubit Reset and 25x Circuit ThroughputTier 2

IBM Quantum has announced the official release of IBM Quantum Nighthawk r2 (deployed as ibm_phoenix), its fastest quantum processing unit (QPU) to date. Built on a square-lattice architecture, the 120-qubit processor introduces a high-speed dissipative qubit reset framework that eliminates long inter-circuit idle periods, achieving a maximum circuit throughput of over 100...

George Mason University Partners with TreQ to Install $7.7M Open-Architecture Quantum QPU in VirginiaTier 2

George Mason University has entered into a strategic hardware partnership with Oxford-based quantum infrastructure firm TreQ to deploy an open-architecture quantum computer at its Northern Virginia campus. Supported by catalytic funding from the Virginia Innovation Partnership Corporation (VIPC) alongside university capital, the $7.7 million system will represent the firs...

Characterizing Large Scale Quantum Systems with Error Per Circuit LayerTier 3

Quantum benchmarks provide compact measures of performance that are important for evaluating and comparing quantum systems. Circuit-level benchmarks are particularly valuable because they capture the accumulated effects of noise across interacting operations, but existing approaches may require structured gate sets and costly compilation, classical simulation of reference ou...

Quantinuum and Aramco Execute Non-Binding MoU for Energy Sector Quantum R&DTier 2

Trapped-ion quantum hardware developer Quantinuum (NASDAQ: QNT) and integrated energy firm Aramco have executed a non-binding Memorandum of Understanding (MoU) during the LEAP technology conference in Riyadh. The agreement establishes a framework for preliminary technical onboarding, knowledge exchange, and benchmarking quantum modalities to identify industrial use cases...

SEEQC Signs MoU with Taiwan Quantum Industry Technology Promotion Office to Build Cryo-Chip Supply ChainTier 2

Digital quantum computing platform developer SEEQC has signed a Memorandum of Understanding (MoU) with Taiwan’s Quantum Industry Technology Promotion Office (QITPO)—an agency established under the Ministry of Economic Affairs (MOEA)—to formalize a cross-border quantum technology and supply-chain partnership. Signed at SEMICON Taiwan 2026 in Taipei, the agreement creates a...

Classiq Expands in Taiwan via Go-to-Market Partnerships with Scientek and KenshoTier 2

Quantum software engineering platform Classiq Technologies has entered into dual market development agreements in Taiwan with technology distributors Scientek Corporation (a Zen Voce company) and Kensho. Timed alongside SEMICON Taiwan 2026, the partnerships establish local distribution, customer enablement, and joint application R&D channels across Taiwan’s semiconduc...

Rigetti and Purdue University Demonstrate Quantum Preconditioning Framework for Constrained OptimizationTier 2

Quantum computing developer Rigetti Computing and researchers from Purdue University have published joint research extending Rigetti's quantum preconditioning framework to hard-constrained combinatorial optimization problems. By using two-point variable correlations extracted from shallow Quantum Approximate Optimization Algorithm (QAOA) circuits to modify the objective f...

Quobly Signs Dual Agreements with TNO and OrangeQS to Industrialize Silicon Spin Qubit ManufacturingTier 2

French silicon quantum computing developer Quobly has signed two strategic cooperation agreements in the Netherlands with the Netherlands Organisation for Applied Scientific Research (TNO) and automated test equipment provider Orange Quantum Systems (OrangeQS). Executed during an official state visit by French President Emmanuel Macron and Dutch Prime Minister Rob Jetten,...

Jülich Launches Trapped-Ion Quantum Computer For Supercomputing IntegrationTier 2

Quantum communication and Bell nonlocality require infinite classical communication to simulateTier 3

A quantum system of any fixed dimension can be prepared in a continuum of states, yet it cannot be used to transmit an unlimited amount of classical information. Similarly, the correlations observed between measurement outcomes on separate parts of a shared quantum system can be stronger than classical correlations, but they cannot transmit information. These fundamental lim...

Measurements on the separated subsystems of an entangled stateTier 3

The entangled states of composite quantum systems are well studied. The particle-like nature of these systems also means that, while entangled, they can be physically separated and measurements performed on the separated subsystems. Measurements on the separated subsystems A and B should pertain to vectors in the local Hilbert space of each subsystem, but to date it has not...

Parameterised graph theory for tensor networks: entanglement rerouting, structural simplification, and agnostic tomographyTier 3

Parameterised graph theory studies how the complexity of graph-theoretic problems depends on structural parameters of the input graph. This perspective has proved useful in analysing tensor-network simulation (Markov and Shi, 2008). Its implications for tensor-network representations and tomography are less well understood. In particular, which graph parameters determine whe...

Vanilla Exact Synthesis of CNOT Circuits is NP-hardTier 3

Exact CNOT synthesis asks for a minimum-size CNOT circuit implementing an invertible linear transformation. Although several related synthesis models have been shown to be computationally hard, their hardness proofs rely on additional structure such as restricted qubit connectivity, encoded inputs, or unrestricted intermediate variables. The complexity of the most basic sett...

Efficient Conversion of Optical to Mechanical States Close to the Single-Quantum LevelTier 3

Coherent interfaces between optical photons and mechanical excitations provide a promising route towards phonon-state engineering and hybrid quantum information processing. Cavity optomechanical systems enable such interfaces via optomechanically induced transparency (OMIT), allowing coherent mapping between traveling optical fields and localized mechanical modes. However, p...

Non-Abelian string melting and thermalization in an open lattice gauge theoryTier 3

Open-system lattice gauge theory (LGT) has so far been developed predominantly in Abelian settings, leaving open how genuinely non-Abelian gauge structure reshapes dissipative real-time dynamics. Here, we study a 1+1D SU(2) Yang--Mills LGT with dynamical matter coupled to a thermal scalar environment through a gauge-preserving Lindblad evolution, which we solve using tenso...

Real-Time String Dynamics in 3+1D Lattice Quantum ElectrodynamicsTier 3

Understanding real-time string dynamics in three spatial dimensions is essential for connecting quantum simulations of lattice gauge theories (LGTs) to the physical dimensionality of QED and QCD, where transverse fluctuations and competing local processes proliferate. We present the first real-time simulations of string breaking in 3+1D lattice quantum electrodynamics. Usi...

Effective Hamiltonian description on monitored Majorana chains: correlated power-law hoppings and unconventional entanglement scalingTier 3

We investigate the structures of effective Hamiltonians governing monitored dynamics of a one-dimensional Majorana chain through the Lyapunov spectral analysis. We focus on a gapless phase characterized by finite-size scalings different from those in conventional critical and/or frustration-free systems; the spectral gap closing faster than 1/L but slower than 1/L^2 and...

Small-quench Loschmidt dynamics near quantum critical pointsTier 3

We study the short-time Loschmidt dynamics after a small sudden quench near a quantum critical point. We show that the initial quadratic growth of the Loschmidt rate function is governed by the variance of the quench operator per system size. For a local quench operator, this variance density is exactly equal to the spatial sum of the equal-time connected two-point correlati...

Quantum-Enhanced Phase Estimation with Photon-Added Even and Odd Coherent States in an SU(1,1) InterferometerTier 3

We investigate phase estimation in an SU(1,1) interferometer employing m-photon-added even and odd coherent states as nonclassical input resources. The phase sensitivity is evaluated through intensity detection and the error propagation method, while the ultimate precision limit is determined from the quantum Cramér-Rao bound with the quantum Fisher information serving as...

Limits of Stochastic Semigroups and Block-Triangular MajorisationTier 3

We investigate limits of semigroups of stochastic matrices defined by their invariant distribution. Given probability vectors γ(β) depending on a parameter β, we introduce a notion of convergence as β→∞ for the corresponding semigroups of γ(β)-preserving stochastic matrices and investigate the structure of the resulting limit. In general, the limiting semigrou...

Discrete time crystals in disordered anisotropic Heisenberg chainsTier 3

A discrete time crystal is an out-of-equilibrium phase of matter characterized by the spontaneous breaking of discrete time-translation symmetry. Using extensive numerical simulations based on matrix-product-state methods, we provide evidence for discrete time-crystalline behavior in strongly disordered spin chains with Heisenberg interactions, including the isotropic point,...

Robust multi-hypothesis quantum-state discrimination under unknown common unitary perturbations via least favorable priorsTier 3

We study robust K-ary quantum-state discrimination when all candidate states are affected by the same unknown common unitary perturbation. The unknown perturbation does not represent the label to be identified, but acts as a nuisance factor that changes the performance of a fixed measurement. We formulate the problem as a minimax decision problem over the possible perturbati...

Quasi-local form for α--z Rényi QNEC from fixed-ray escortsTier 3

The fixed-ray escort integral representation expresses α--z Rényi divergence as an average over ordinary relative entropy of a family of escort states. Working in the standard UV-regulated density-matrix description of QFT subregions, we use this representation to derive an escort-averaged entanglement first law, an escort-averaged representation of the α--z informat...

Ultra-Precise Quantum Projective Designs in Constant DepthTier 3

Random quantum objects are powerful resources for quantum information processing, yet exact Haar randomness is costly and typically unnecessary. We introduce an explicit sparse commuting circuit ensemble on n qubits that reproduces low-order Haar moments in the stringent relative-error sense. The circuit consists of a sparse Clifford phase layer followed by independent sin...

Spin-to-polarization mapping with a coherent quantum dot-cavity receiverTier 3

Coherent light-matter interfaces controllably modifying the state of a photon upon interaction with a stationary qubit are a key resource for implementing deterministic entangling gates for optical quantum technologies. This requires a one-to-one mapping between the state of the scattered photon and that of the embedded qubit. Here, we present an experimental signature of su...

Exact Compatibility Geometry of Three-Qubit EntanglementTier 3

We present a permutation-symmetric supporting relation between the pairwise concurrences and the three-tangle in three-qubit system, whose extrema are attained only by the symmetric W and GHZ local-unitary classes. Furthermore, by introducing the concept of a four-dimensional compatibility body, we show that our proposed global relation and the previous CKW relation can be...

Universal Driven Critical Dynamics of Entanglement EntropyTier 3

The Kibble-Zurek mechanism (KZM) and finite-time scaling (FTS) provide a foundational framework for driven critical dynamics, yet their predictive power has been largely confined to local observables. Here, we establish a universal finite-time scaling theory for the nonequilibrium dynamics of quantum entanglement. Using unbiased quantum Monte Carlo simulations, we investigat...

The Casimir free energy of peptide films on a silicon substrate: Impact of dielectric-to-metal transition in silicon and nanoparticles in peptideTier 3

Using the Lifshitz theory of the van der Waals and Casimir forces, we calculate the Casimir free energy of thin peptide films deposited on silicon substrates. The Casimir free energy is found as a function of film thickness for different fractions of water in the film, in the presence of either nonmagnetic or magnetic nanoparticles, and under the impact of irradiation of a s...

Quantum Query Complexity of Finding a Tarski Fixed Point on a High-Dimensional GridTier 3

The Knaster-Tarski fixed-point theorem states that every monotone function over a complete lattice has a fixed point. Beyond its fundamental role in order theory, the theorem and its algorithmic variants have found broad applications in areas such as economics, game theory, and programming languages. While the query complexity of finding a Tarski fixed point has been extensi...

Quantisation of Abstract Data TypesTier 3

In this paper, we introduce a notion of abstract quantum data type within the framework of universal algebra. This notion provides an algebraic foundation for describing data abstraction in quantum programming. We formally define a quantisation of classical data types and show that their equational specifications can be soundly lifted to the quantum setting. Two standard qua...

Metricity of separable quantum optimal transport with the Hilbert-Schmidt costTier 3

We prove that the square root of the separable quantum optimal transport cost associated with the orthogonal projection onto the antisymmetric subspace defines a genuine distance between density matrices. Equivalently, this establishes the triangle inequality for the order-two Beatty-França quantum optimal transport construction induced by the Hilbert-Schmidt distance betwee...

Thermodynamic Irreversibility from Inaccessible Endogenous Quantum HistoriesTier 3

Microscopic unitary dynamics preserves all fine information, yet an isolated finite system can show a robust thermodynamic window in which the entropy associated with a restricted record rises. We ask why information hidden from the current record usually fails to rebuild a low-entropy macrostate. For a fixed projective record, every finite step separates exactly into the ev...

Generalized s-d model for Wannier-Mott excitons in layered magnetic semiconductorsTier 3

The recent discovery of excitons coupled to the magnetic order, and the consequent strong magneto-optic responses, in some van der Waals magnetic semiconductors has triggered intense activity at the interface of magnetism and semiconductor optics. Here, we present an analytically tractable minimal model that describes magnetic order, electrons, holes, and excitons within a u...

Q-Edge: Symmetry-Reduced Quantum Simulation of Structured Extreme DependenceTier 3

High-dimensional simulation of multivariate extremes is fundamentally limited by the combinatorial complexity of dependence, often more than by the scarcity of extreme observations. We show that symmetry admits a lossless orbit-space representation that preserves structured extreme dependence while replacing an exponentially large dependence space with a compact set of symme...

Entanglement dynamics of accelerated atoms with environment-induced interactionsTier 3

We investigate the influence of environment-induced interactions on the entanglement dynamics of two uniformly accelerated atoms coupled to a fluctuating massless scalar field with a reflecting boundary. The two atoms are aligned vertically to the boundary. The entanglement behaviors are influenced by the competition between the environment-induced interatomic and the enviro...

Quantum Quasi-Monte Carlo: a window for pre-asymptotic quantum advantageTier 3

Numerical integration with Monte Carlo methods is a central computational task in many scientific and industrial applications, including financial derivative pricing and risk management. Classical Monte Carlo algorithms are computationally demanding: achieving an accuracy ε typically requires a number of function evaluations scaling as O(1/ε^2). Quantum-accelerated Monte...

Optimizing Atom Transport, Gate-Count and Depth with Parity TwineTier 3

We present an efficient implementation of the Parity Architecture for neutral-atom quantum processors. We adapt Parity Twine Networks (PTNs) to different atom layouts, native entangling gates, and atom-shuttling capabilities. This provides a general framework for hardware-aware optimization of gate count, circuit depth, and atom transport for quantum circuits encoding arbitr...

Enhancing noise robustness in device-independent conference key agreement with asymmetric parity-CHSH inequalitiesTier 3

Conference key agreement allows multiple remote parties to establish a shared secret key with information-theoretical security. In device-independent conference key agreement, security can be guaranteed with minimal assumptions on the devices used, provided that a violation of a Bell inequality is observed. However, implementations are extremely challenging because high dete...

Heralded one-, two- and three-photon states from waveguided parametric down-conversionTier 3

The manifold coincidences and singles counting provides a resource-saving quantum-optics analysis tool, since it is appropriate even in the presence of heavy experimental imperfections. Here, we prepare cross-polarized twin beams in the telecommunication wavelength range via parametric down-conversion in a periodically-poled KTiOPO_4 waveguide and herald photon-number stat...

Topology-Dependent Enhancement of Entanglement Extraction in Repeater Graph StatesTier 3

Quantum repeaters are essential for establishing long-distance quantum communication to overcome the exponential decay of entanglement due to photon loss. Traditional repeater architectures rely on physical quantum memory, which introduces decoherence and poses significant practical implementation challenges. The repeater graph state (RGS) architecture offers a promising mem...

Weakly Driven and Finite Detuning Boundary Time Crystals Enabled by Low-Dissipation Dynamical ChannelsTier 3

Spontaneous breaking of continuous time-translation symmetry in driven-dissipative systems gives rise to boundary time crystals (BTCs), characterized by persistent oscillations sustained by coherent driving and collective dissipation. Conventional BTCs, however, typically require strong driving and exact atom-drive resonance, imposing stringent constraints on their realizati...

Pasqal and True Nexus Encode Protein Gelation Structures on Neutral-Atom QPUsTier 2

Neutral-atom quantum hardware vendor Pasqal (Nasdaq: PSQL) and Saudi deep-tech startup True Nexus have announced a technical milestone in applying quantum computing to structural biology. Supported by Saudi Arabia’s Ministry of Communications and Information Technology (MCIT), the teams successfully encoded protein structures associated with molecular gelation—the phase t...

Previously: 2026-09-03, 2026-06-12, 2026-05-20

MIT Qubit Design Could Speed Quantum Operations While Preserving DataTier 2

Quantum Foundry Copenhagen Plans 5,300-Square-Meter Chip FacilityTier 2

Andhra University Plans Centres of Excellence for Quantum, AI and SemiconductorsTier 2

Argonne and JPMorganChase Develop New Method to Study QAOA at ScaleTier 2

Spurious quantum correlationsTier 3

In his seminal paper, Bell [Physics Physique Fizika 1, 195 (1964)] considers the correlations that result from space-like separated measurements on a pair of entangled particles. He uses relativity theory to motivate the Bell causal structure, then shows the existence of quantum correlations that cannot be explained classically within this causal structure. Classical explana...

Quobly and Orange Quantum Systems Partner on Silicon Spin Qubit TestingTier 2