October 9, 2026

Error-Corrected Memory and Logic on a Heavy-Hex Superconducting-Qubit ProcessorTier 3

Large quantum computations require high-fidelity error-corrected memory and fault-tolerant logical operations. To achieve these with superconducting circuits, quantum processors will need many components operating with low error rates. In practice, fabrication of monolithic superconducting devices produces unavoidable heterogeneity in component performance, which the quantum...

Neutral-Atom Developer Oratomic Secures $775 Million in Cumulative Funding for Fault-Tolerant System R&DTier 2

Oratomic, a Pasadena-based quantum hardware developer, has secured $775 million in cumulative funding to advance its fault-tolerant quantum computing systems. The company focuses on neutral-atom arrays and quantum error correction, aiming for utility-scale quantum computers.

Quantitative Rules for Parallel Calibration and Drift-Resilient Maintenance of Large-Scale Superconducting Quantum ProcessorsTier 3

As superconducting quantum processors scale toward hundreds of qubits, manual calibration becomes increasingly costly and difficult to sustain. Here we address two system-level factors governing automated calibration, namely, crosstalk induced by parallel operations and temporal drift of control parameters. On a 66-qubit superconducting processor, cross-entropy benchmarking...

Measure Now, Mitigate Later: Virtual Error Cancellation for Logical Quantum CircuitsTier 3

Early fault-tolerant quantum algorithms are a key step in scalable quantum computing, but are ultimately constrained by residual, uncorrectable logical errors. Logical quantum error mitigation can eliminate this bias, however its standard requirements include prior noise characterization, more complex experiments, and substantial sampling overhead. Although no mitigation tec...

Quantum Co-Design of Inhomogeneous Many-Body Neutrino Fast Flavor TransformationTier 3

Dense-neutrino flavor evolution is a quantum many-body problem whose fully correlated treatment becomes rapidly more expensive with increasing particle number and spatial structure. We develop a \texttt{QCNO} quantum simulation code that maps a inhomogeneous forward-scattering neutrino Hamiltonian with advection and finite-range interactions to TEBD2 product-formula quantum...

Experimental generation of asymmetric keys from the parity structure of a two-photon six-qubit entangled stateTier 3

We propose and experimentally demonstrate an asymmetric key-generation scheme in which public and private keys are derived from a six-qubit photonic entangled state. A six-qubit entangled state is generated from two photons, each carrying one polarization and two path qubits. The state is prepared in an equal superposition of eight of the sixty-four six-qubit basis states, i...

A quasiparticle-protected superconducting qubitTier 3

Superconducting quantum circuits underpin large-scale quantum processors and are increasingly interfaced with optical systems, yet they are vulnerable to quasiparticle poisoning from high-energy radiation and optical fields. Gap engineering of Josephson junctions suppresses quasiparticle-induced relaxation, but quasiparticles near the junction can still shift the qubit frequ...

Secure Quantum Handshakes: Quantum Network Verification Via Simon's AlgorithmTier 3

Quantum networking represents the future of secure communication, enabling fundamentally new capabilities through quantum information exchange. However, these networks require secure, high-fidelity quantum communication channels, and they require every participating node to be a genuine quantum device. Currently, there is no reliable method to verify whether clients entering...

Autonomous Code Migration for Quantum Programming Languages: A Case Study with QED-C BenchmarksTier 3

Quantum programming requires concepts and intuition that differ substantially from those used in traditional programming languages. Multiple quantum programming frameworks address these requirements through different abstractions and execution models, creating tradeoffs in programmability, portability, and performance. Because quantum software is less prevalent in the traini...

Large-Scale Benchmarking of Quantum Neural Network Configurations for Financial Time Series ForecastingTier 3

Quantum machine learning, and quantum neural networks (QNNs) in particular, are advancing fields with growing potential. Although systematic comparisons of QNN configurations have been explored primarily for classification tasks, comparatively little attention has been given to regression problems, particularly financial time series forecasting. This study presents a large-s...

Who can sample forever? Shot noise effects in quantum linear regressionTier 3

Quantum fidelity kernels and quantum extreme learning machines share the same basic architecture: a fixed quantum device generates features that are combined through a classically trained linear model. We refer to this broad non-variational setting as quantum linear regression. A defining aspect of these models is that the quantum features are not directly available, but mus...

Beyond QAOA: A Review of AI and Quantum Computing for Adaptive Combinatorial OptimizationTier 3

Near-term quantum approaches to combinatorial optimization are limited by qubit counts, circuit fidelity, sampling cost, and the difficulty of encoding constraints, while machine learning is increasingly used to configure and control quantum optimization workflows. We call such workflows adaptive: decisions conventionally fixed in advance, from formulation and penalties to s...

Parameter-Dependent Noise Resilience in the Quantum Approximate Optimization AlgorithmTier 3

The Quantum Approximate Optimization Algorithm (QAOA) is a variational quantum algorithm used for solving combinatorial optimization problems, which is thought to be a promising application of near-term quantum hardware. However, high rates of noise in these devices can obscure meaningful results. Therefore, it is crucial to understand and suppress the effects of noise on th...

An Efficient Quantum Circuit for Flow Model Execution Using Quantum Neural NetworksTier 3

Flow models generate trajectories from an initial distribution to a target distribution by solving an ordinary differential equation defined by a velocity field. Flow matching learns this velocity field by modeling the transport dynamics between the two distributions. Wavefunction flow establishes a formal connection between flow models and quantum dynamics by introducing a...

An iterative Bayesian variational quantum eigensolver with the von Mises-Fisher distributionTier 3

We develop an iterative Bayesian variational quantum eigensolver in which the unknown ground state, parametrised as a real unit vector, is inferred through a von Mises--Fisher distribution sequentially updated from Hadamard-test measurements on a single ancilla qubit. Building on a companion paper that treated a single success outcome via exact moment matching, we generalise...

Theory of the CH_S^- Defect in MoS_2 Confirming the Origin of the Quantum EmissionTier 3

Establishing the microscopic origin of localized emission in two-dimensional materials through consistent agreement between experiment and theory remains challenging. Recent STM/STS-STML measurements assigned an emission near 1.8 eV in monolayer MoS_2/hBN(2L)/graphene to the negatively charged CH_S^- defect. However, a comprehensive theoretical description of...

Non-Perturbative Vibrational Excitation by Arbitrary Electric Fields from Classical Phase-Space DynamicsTier 3

We present a non-perturbative framework for the quantum treatment of vibrational excitation in molecular systems driven by electric fields with arbitrary time dependence. For harmonic potentials with linear dipole coupling, the field-induced dynamics is exactly described by a displaced coherent state, whose evolution is completely determined by a complex phase-space coordina...

U.S. Department of War Announces $350 Million Quantum Package, Highlighted by $150 Million OSC Loan Commitment for PsiQuantumTier 2

PsiQuantum has secured a conditional loan commitment of up to $150 million from the U.S. Office of Strategic Capital to expand its PsiFactory in Milpitas, California. This funding will support the development of a domestic supply chain for quantum computing and follows other significant investments from DARPA and the U.S. Department of Commerce. PsiQuantum is also develop...

Universal Quantum Closes $100 Million Series A to Accelerate Modular Trapped-Ion Architecture ScalingTier 2

Universal Quantum, a UK-based hardware developer specializing in trapped-ion quantum processors, has successfully closed a $100 million Series A funding round. This investment will fuel their international expansion, including operations in Europe, Singapore, the U.S., and Japan, and support their $77 million contract with the German Aerospace Center. Their technology uti...

Fujitsu Launches Collaboration With State of New Mexico to Establish Quantum Computing Research CenterTier 2

Insider Brief PRESS RELEASE — Fujitsu announced a collaboration with New Mexico to establish a quantum computing research center in New Mexico. The center will conduct advanced research spanning quantum computing hardware, software, algorithms, and theory, while supporting education and workforce-development initiatives designed to expand the quantum talent pipeline an...

NSF Launches New Programs for Quantum Innovation and STEM ResearchTier 2

Insider Brief PRESS RELEASE — The U.S. National Science Foundation today announced plans to launch a series of programs and initiatives to support the ambitious vision articulated in the White House report Science: A New Golden Age, the first comprehensive rethinking of the U.S. science and technology enterprise in the last 80+ years. These new programs […]

NTT DOCOMO BUSINESS and Classiq Partner on Enterprise Quantum Computing in JapanTier 2

Insider Brief PRESS RELEASE — NTT DOCOMO BUSINESS, Inc. (formerly NTT Communications Corporation) and Classiq Technologies G.K., the Japanese subsidiary of Classiq Technologies Ltd., today announced a memorandum of understanding establishing a strategic business partnership aimed at accelerating enterprise adoption of quantum computing in Japan. Under the partnership,...

Toward Joint Optimization of Circuit Depth and Training Data Size in Adaptively Grown Quantum ClassifiersTier 3

Building a quantum model involves a tradeoff: how complex the circuit should be, and how much training data it needs. Caro et al. show that models with fewer trainable gates need less training data to generalize well. Q-FLAIR shows that a quantum feature-map circuit can be grown gate-by-gate, stopping once further growth stops improving the training loss. We ask whether thes...

Local polarization control of optical tweezer arraysTier 3

Optical tweezer arrays trapping ultracold atoms and molecules are a versatile quantum science platform with broad impact in quantum simulation, quantum computation, and quantum metrology. The polarization dependence of anisotropic vector and tensor light shifts offers a degree of freedom for precise quantum state engineering of trapped particles. Similarly, state-selective o...

Improved Local Leakage Resilience of Shamir Secret Sharing and Worst-Case Optimal Polynomial IntersectionTier 3

We study two problems: Local Leakage Resilience (LLR) for Shamir secret sharing, and worst-case Optimal Polynomial Intersection (OPI). Both problems concern polynomials Q(X) of degree less than k, over a prime-order finite field F_p. In LLR for Shamir secret sharing, one asks how much one can learn about Q(0) given a few bits leaked from each of Q(α_1), ld...

Constructing Large and Structured Decoherence-Free Subspaces in Hybrid Quantum SystemsTier 3

We develop a framework to construct large decoherence-free subspaces with a non-trivial structure. The construction is based on hybrid quantum systems in which quantum matter is coupled to a dissipative bosonic mode. Dissipation imposes a global constraint on the matter by selecting the matter null states in the long-time limit. The decoherence-free subspaces spanned by matt...

Residual-Guided Global-Drive Design in Trapped-Ion Quantum SimulatorsTier 3

Trapped-ion quantum simulators are powerful platforms for exploring many-body physics, yet engineering of arbitrary interaction graphs remains a central challenge. To leverage the intrinsic structure of native motional modes and thereby enhance programmability, a residual-guided optimization protocol is introduced for the systematic design of multi-tone global drive spectra....

Accessing electronic entanglement via photo-assisted two-electron tomographyTier 3

Witnessing entanglement between electrons propagating in quantum circuits requires accessing their two-electron coherences, which encode the two-particle quantum correlations generated by Coulomb interactions. Yet, experimental reconstruction of two-electron coherence remains a major challenge. We introduce photo-assisted two-electron tomography, a quantum coherence reconstr...

Mutually unbiased bases: common states, completion, and extension obstructionsTier 3

Which pure states give uniform outcomes in several mutually unbiased measurements, and when can they form another measurement basis? We distinguish common unbiased states, their orthonormal completion, and further extension. For a displayed phase-deformed Fourier pair in dimension $2m$, a clock symmetry and skew antiunitary complete every prescribed common unbiased state to...

The Imaginary Component of the Weak Momentum: Spectral Vanishing and Gauge InvarianceTier 3

We establish a rigorous functional-analytic framework for the imaginary component p_I of the complex weak momentum p_Q = p_R + ip_I = (ℏ)/i∇lnψ. For every wavefunction in the Sobolev space H^1(Ω), including those with nodal sets, we prove that the expectation value of p_I vanishes identically, as a consequence of the regularity of ρ= |ψ|^2 and witho...

Mass quench in interacting finite-size quantum field systemTier 3

In this work, we theoretically investigate the non-equilibrium evolution of the correlation functions of a quantum scalar field following a mass quantum quench in a finite-size system. The self-consistent equation for the Keldysh (statistical) correlation function is solved numerically in the one-loop approximation. A specific spatio-temporal effect is observed: at a point i...

Exact value and rigidity of the 2×3 magic rectangleTier 3

The 2×3 magic rectangle is a nonlocal game in which two players match entries subject to incompatible parity constraints. We prove that its quantum value is (1+√(2/3))/2 and classify all optimal strategies in arbitrary finite local dimensions, allowing general measurements. Every optimal strategy contains a maximally entangled pair of four-dimensional systems, w...

On the separability of Bell-diagonal states with absolutely positive partial transpositionTier 3

Absolutely positive partial transpose (APPT) states, which remain PPT under every global unitary, provide a spectral relaxation of absolutely separable states, which remain separable under every such transformation. Despite substantial progress, whether these two notions coincide beyond qubit-qudit systems remains unresolved, motivating the study of structured state families...

Sharing of Gaussian tripartite steering in de-Sitter spaceTier 3

We investigate the redistribution and directional properties of Gaussian tripartite quantum steering in de-Sitter space within the continuous-variable framework. By expressing the Bunch-Davies vacuum in terms of the open-chart modes through a Bogoliubov transformation, we derive the covariance matrix of the resulting multipartite Gaussian state and analyze both one-to-two an...

From Majorana to Bloch: two ways to generalize the Bloch sphere representationTier 3

While the Bloch sphere provides a canonical geometric representation for qubits, its generalization to pure qudit states (d>2) is not unique. This representation can be extended following two different approaches: increasing the number of points, as in the Majorana representation, or using a single point but in a space of larger dimension, as in the generalized Bloch repre...

Extended Results on Absorbing Boundary Conditions as Limits of Complex PotentialsTier 3

In quantum mechanics, among the proposals for how to compute the probability distribution of detection time and place along a given spatial surface or in a given volume, two leading candidates involve absorbing boundary conditions (ABCs) and complex absorbing potentials (CAPs) for the Schrödinger equation. Here, we extend earlier results on how the two are related. It was pr...

Tunable Ultrastrong Magnon-Magnon Coupling and Squeezed States in a Triaxial Van der Waals AntiferromagnetTier 3

Achieving and quantifying ultrastrong magnon-magnon coupling (USC) remains a key challenge for quantum magnonics. Here, we demonstrate widely tunable USC between chiral (right- and left-handed) and acoustic or optical magnon modes in the van der Waals antiferromagnet CrPS_4. Using a full quantum model, we decompose the interaction into three microscopic interaction channel...

Dielectric constant of holographic insulator from quantum geometryTier 3

We study dielectric properties of holographic insulators from the quantum geometry of the ground state. We realize the insulating state by the pseudoscalar interaction of holographic fermions and calculate the fermionic Green function to extract the effective hamiltonian. We then derive the quantum metric and Berry curvature to compute the transports and finally get the diel...

Spin-outcome correlations and memory-assisted entropic uncertainty in Bhabha scattering with an entangled spectatorTier 3

We investigate spin-outcome correlations and memory-assisted entropic uncertainty in tree-level Bhabha scattering, where an incident electron A scatters with a positron B initially entangled with a spectator electron C. For the fixed-angle post-selected final state, we compare the total memory-assisted uncertainty U_A for three alternative Pauli measurements on A w...

Remote nonreciprocal magnon magnon entanglement via the Barnett effect with coherent feedbackTier 3

We propose a scheme for generating and controlling remote nonreciprocal magnon--magnon entanglement in a cavity magnonic system with coherent feedback.The two microwave cavities are driven by independent single-mode squeezed vacuum fields, with a rotating YIG sphere in the left cavity and a stationary one in the right cavity. For a fixed rotation direction, reversing the bia...

A Power-Liouville Hermite Orbit: Common Spectral Quantization of the Singular Sextic Oscillator and Fractional-Power PotentialsTier 3

A singular sextic oscillator in the finite-Hermite biconfluent-Heun hierarchy generates an exact four-member power-Liouville Hermite orbit. Power coordinate transformations with the Liouville amplitude map the hierarchy member N=4 to four half-line Schrödinger spectral charts while preserving the physical regular-recessive Wronskian zero set under energy-coupling reparamet...

Certifying Hidden Paths: Scalable Topology Assurance for QKD NetworksTier 3

Large-scale Quantum Key Distribution (QKD) networks rely on trusted repeaters, making the security properties of the selected communication path an essential part of end-to-end assurance. At the same time, network operators may be unwilling to disclose their internal topology. We present a topology-certification mechanism that lets a provider prove in zero knowledge that pol...

Topological Superradiant Universality Classes in Cavity-Mediated Spin ChainsTier 3

Superradiant phase transitions are fundamental phenomena in light-matter coupled systems. Here, we uncover a novel class of superradiant criticality that is topologically distinct from previously known superradiant transitions. Using cavity-mediated cluster-Ising chains as an illustrative example, we numerically demonstrate that the critical line separating the superradiant...

NSF Names Founding Partners for X-Labs Consortium, With Occam Foundry and Florida Quantum Center Among ThemTier 2

Insider Brief The U.S. National Science Foundation has put names to the founding partners of its new NSF X-Labs Consortium, the private-sector and philanthropic backbone for the agency’s $1.5 billion X-Labs initiative. In a post on X, NSF thanked the Astera Institute, Ginkgo Bioworks, Tom Secunda at the Secunda Family Foundation, the Alfred P. Sloan […]

NVIDIA Commits $1 Billion to U.S. Science and Quantum ComputingTier 2

Insider Brief PRESS RELEASE — NVIDIA today announced commitments valued at $1 billion to build out the United States’ capacity for super intelligence research and development in fields critical for U.S. leadership, including quantum computing, healthcare and energy security. The announcement was made during the Science: A New Golden Age event in Washington, D.C., where...

PsiQuantum Receives Conditional $150M Loan Commitment From U.S. Department of WarTier 2

Insider Brief PRESS RELEASE — PsiQuantum announced today that the company has received a conditional commitment for a loan of up to $150 million from the U.S. Department of War’s Office of Strategic Capital (OSC), which would expand the company’s advanced manufacturing and prototyping capabilities in the United States. The financing would support PsiQuantum’s 140,000-s...

Previously: 2026-09-09

Multipartite entanglement spreadsTier 3

The entanglement structure of a bipartite pure state is characterized by its entanglement spectrum, or equivalently, by the family of Rényi-k entanglement entropies with integer k. Taking the difference of two such entropies defines a quantity known as an entanglement spread, that is monotonous under local operations, and that vanishes if and only if the entanglement spe...

Arqit Announces Preliminary Fiscal 2026 Financial ResultsTier 2

Insider Brief PRESS RELEASE — Arqit Quantum Inc. (Nasdaq: ARQQ) (“Arqit”), a global leader in quantum-safe encryption, announces select preliminary financial results for the second half and full fiscal year 2026. Based on preliminary unaudited results, management expects revenue for the second half period ended 30 September 2026 of approximately $355,000 to $380,000. F...

Quartic Certificates for Pure-State Tomography with Pauli MeasurementsTier 3

Full Pauli-basis tomography of an arbitrary n-qubit state uses the expectation values of all nonidentity Pauli observables. For multiqubit systems, prior knowledge that the state is pure allows some of these observables to be omitted while retaining uniqueness. We study two resulting notions of uniqueness: whether every pure state is uniquely determined among pure states (...

On PPT entanglement distillationTier 3

We study entanglement distillation under operations that remain completely positive under partial-transpose conjugation, a.k.a. PPT channels, in the standard quantum Shannon theory regime of asymptotically vanishing but non-zero error. Our main results are: (a) a regularised formula for the PPT distillable entanglement in terms of a measured-relative-entropy-like quantity; a...

Patenting Quantum Computing Innovations – Part 5: Shor’s Algorithm and ConclusionsTier 2

In part five of our five part series on quantum patents, Sinan Utku discusses why an attempt to patent Shor's algorithm would likely be challenged. The article concludes with an observation about the uncertain state of patent eligibility law in the US.