October 7, 2026

Xanadu Partners with GlobalFoundries to Scale Photonic Quantum Component Manufacturing on 300 mm Semiconductor LinesTier 2

Xanadu and GlobalFoundries have partnered to mass-produce photonic quantum computing components. This collaboration will transition Xanadu's designs for ultra-low loss Silicon Nitride optical circuits and Superconducting Nanowire Single-Photon Detectors (SNSPDs) to GlobalFoundries' 300 mm commercial semiconductor fabrication facility. This aims to scale up the manufacturi...

Previously: 2026-09-01

Observing the magic Mpemba effect in localized dynamics on a digital quantum computerTier 3

The Mpemba effect challenges the intuition that states closer to equilibrium must relax faster. We ask whether an analogous magic-ordering reversal can occur in the generation of quantum magic (nonstabilizerness), a key resource for universal quantum computation: can a state with less initial magic overtake one with more and reach its asymptotic value sooner? Here, we uncove...

Fault-tolerant resource estimation for ground-state preparation via Lindblad simulationTier 3

Recent advances in algorithms for simulating Lindblad dynamics have clarified their theoretical potential for state preparation, but their practicality in the early fault-tolerant regime and beyond remains uncertain. In this work, we address this by investigating the cost of preparing ground states of the fermionic Hubbard model, following the single-ancilla approach of [Phy...

Physical Design Automation for Planar Superconducting Quantum ChipsTier 3

Superconducting circuits have emerged as one of the most promising and scalable platforms for quantum com- puting, with substantial industrial adoption driving qubit counts steadily upward. Yet the layout of the corresponding chips is still primarily performed manually, consuming multiple days or weeks of expert effort, even for moderately sized designs. Existing automation...

Multi-time advantage for certifying quantum coherenceTier 3

Non-classical dynamics in open quantum systems can be hidden in temporal correlations that are invisible to standard state- and channel-based tests. We define coherence for multi-time quantum processes and show that access to intermediate times can reveal coherence absent from all corresponding pairwise channels. Incoherent processes are fixed points of dephasing on all inpu...

Quantum Entangled Multimodal Fusion Networks (QEMFN): Resource-Aware Hybrid Vision-Language Fusion via Trainable EntanglementTier 3

Multimodal vision-language systems typically fuse image and text embeddings through classical operators such as concatenation, attention, bilinear pooling, or tensor interactions. We propose Quantum Entangled Multimodal Fusion Networks (QEMFN), a hybrid quantum-classical framework that introduces parameterized entanglement as a structured inductive bias for multimodal fusion...

Charging Dicke and Tavis--Cummings quantum batteries with a PT-symmetric lossy--gain cavity pairTier 3

We study how a parity--time-symmetric photonic environment changes the charging of Dicke and Tavis--Cummings quantum batteries. For atoms prepared in the collective ground state the excitation number grows as the square of the charging time, with a coefficient set by the initial mean photon number; the counter-rotating terms of the Dicke model add one to four times that numb...

Demonstration of Parallel Multi-QPU Execution for Fragment-Based Quantum Chemistry Using On-Premises HardwareTier 3

Fragment molecular orbital (FMO) quantum chemistry offers a natural route to parallel quantum computing: large molecular calculations can be decomposed into smaller quantum subproblems that can, in principle, run concurrently. Their practical benefit on real quantum hardware, however, has remained unclear. We demonstrate parallel FMO calculations on three room-temperature di...

Pauli Decomposition by Character Theory: A Memory-Bounded Algorithm for Qubits and QuditsTier 3

Pauli decomposition underpins Trotterization, phase estimation, sparse-Hamiltonian simulation, and variational observables, at exponential naive cost. From the character theory of (Z_2)^n, characters χ_z(v)=(-1)^(⟨v,z⟩) are the diagonal Pauli strings, so any diagonal operator is already Pauli-decomposed. A general operator still needs the shifts: ea...

Inertial Counterdiabatic DrivingTier 3

We introduce an inertial counterdiabatic (CD) protocol that reformulates shortcut-to-adiabaticity design as a moving-frame diagonalization problem. The method employs the Magnus expansion to construct a variational propagator generated by an accessible CD ansatz. In the new rotating frame, the controls are optimized to suppress the off-diagonal Hamiltonian terms, and the CD...

When Expressivity Is Not Enough: Discrete Routing Geometry in Variational Quantum CircuitsTier 3

Finding useful variational quantum circuits requires more than representational capacity: training must also have access to directions that improve the objective. We study how discrete CNOT routing shapes both capacity and local accessibility. For circuits built from CNOT and arbitrary one-qubit gates, we separate binary routing matrices from continuous rotations to relate g...

Post-Selection-Free Quantum Automated LearningTier 3

Quantum automated learning (QAL) trains quantum models by directly updating quantum states, offering an approach to quantum machine learning that avoids optimizing variational circuit parameters. However, post-selection constrains the probability of obtaining the final learned model. We develop a post-selection-free QAL algorithm that organizes a complete training path into...

Zapata Quantum Joins IBM Quantum Network to Accelerate Enterprise Application DevelopmentTier 2

Zapata Quantum has joined the IBM Quantum Network to accelerate enterprise application development by integrating IBM's superconducting QPUs with Zapata's Quantum Pilot platform. This partnership aims to bridge the quantum application gap and develop mission-critical quantum software workflows for various industries. Their collaboration builds on previous research, includ...

The polarization behavior of a system of two interacting identical spins 1/2 in adiabatically varying magnetic fieldTier 3

We derive the density matrix of a nonstationary system in the adiabatic representation and obtain the corresponding Liouville equation. This representation is particularly suitable when the standard interaction representation is inapplicable. We illustrate the approach with two identical, spatially separated spin-1/2 particles coupled by a magnetic dipole-dipole interaction...

Zapata Quantum Joins IBM Quantum Network for Application DevelopmentTier 2

Insider Brief PRESS RELEASE — Zapata Quantum (OTCQB: ZPTA) (“Zapata” or the “Company”) today announced it has joined the IBM Quantum Network with plans to use IBM’s world-class quantum computers with Zapata’s deep expertise in use-case discovery and application development. The Company’s effort aims to help close the quantum application gap by translating advances in [...

Classical Verification of a Remote Quantum Processor via Degenerate Concordant Computations: An Application to Randomness GenerationTier 3

A client who rents a cloud quantum processor cannot easily tell whether the bitstrings it receives came from a quantum device. Certification by random circuit sampling runs on present hardware, but scoring each returned sample costs the client time O(2^n). We give a protocol in which the client scores each round in time O(n), built on degenerate concordant ensembles. Whe...

Polaronic Response of a Supersonic Impurity Strongly Coupled to a Bose CondensateTier 3

How a mobile impurity exchanges momentum and energy with a many-body environment is a central question in nonequilibrium quantum physics. This exchange becomes particularly complex when the impurity moves rapidly and is strongly coupled to its bath. Here, we realize an interaction-tunable cold-atom collider with fermionic ^(40)K impurities immersed in a ^(23)Na Bose--Ein...

Leibniz University Hannover Launches €5.8 Million ($6.53 Million USD) HybriQCS Project to Develop Hybrid Molecule-Rydberg Quantum SystemsTier 2

The HybriQCS project, led by Dr. Kai Voges at Leibniz University Hannover, has secured €5.8 million to develop hybrid quantum computing architectures. This 5-year project, running until February 2031, aims to combine ultracold polar molecules for quantum memory with Rydberg atoms for fast multi-qubit gate operations. The primary goal is to execute the first two-qubit quan...

KIST Connects South Korean Quantum Startups to Midwest Ecosystem Across Wisconsin and ChicagoTier 2

Four South Korean quantum startups, as part of the KIST Global Bridge Program, expanded their U.S. commercial strategy across Wisconsin and Illinois after Quantum World Congress 2026. The delegation engaged with various organizations to foster cross-border technology partnerships and market entry. This initiative is part of South Korea’s Deeptech Incubator Project for Sta...

Pasqal Transitions €50 Million Q-PLANET Pilot Line into Execution Phase for European Neutral-Atom ChipsTier 2

Pasqal has launched the operational phase of Q-PLANET, a €50 million initiative to develop a European supply chain for neutral-atom quantum computing chips. Leading a 28-partner consortium, Pasqal aims to industrialize chip-scale components, including integrated laser sources and atom chips, over three years. This project will standardize manufacturing processes to accele...

Quantifying the fidelity of a quantum memoryTier 3

Quantum memories are key ingredients for future quantum networks. Developing methods for their certification is therefore an important, yet challenging, problem. In this work, we present a general framework for certifying quantum memories and quantifying their performance in an operational and efficient manner, taking advantage of developments in the theory of quantum channe...

Entanglement Swapping Scheduling for Quantum Repeater Chains under Decoherence during Classical CommunicationsTier 3

First-generation quantum repeaters are essential in distributing entanglement over long distances since they could mitigate losses in optical fiber. Repeaters split the total distance into shorter, easier to generate links. Then, entanglement swapping establishes long range entanglement by performing local measurements at the repeaters and heralding their results. In this wo...

Cisco Introduces Software to Coordinate Larger Quantum NetworksTier 2

Insider Brief Cisco has introduced two research prototypes designed to coordinate quantum networks, aiming to make connected quantum machines easier to operate and use. The company’s Quantum Network Controller and updated Network-Aware Quantum Compiler address different parts of that task. The controller coordinates the hardware needed to supply quantum connections, while th...

No-Disturbance-without-Uncertainty generates the Quantum set in the simplest Bell scenarioTier 3

Characterizing the set of quantum nonlocal correlations through information-theoretic constraints is a central problem in quantum foundations. We show that the convex hull of no-signalling behaviors in a bipartite Bell experiment satisfying a common-overlap no-disturbance-without-uncertainty condition is exactly the finite-dimensional quantum set whenever one party has two b...

Efficient Learning of Structured Fermionic States under General Quadratic EvolutionTier 3

We prove that unknown pure fermionic states prepared from disjoint-branch fixed-particle-number blocks can be reconstructed after general quadratic evolution, including pair creation and annihilation. For a fixed particle cap per block, adaptive or nonadaptive single-copy Gaussian measurements yield classical input and circuit descriptions with prescribed fidelity and confid...

Quantum Algorithms for Multivariable Polynomial Transformations: From Efficient Synthesis to Quantum Channel TransformationsTier 3

Polynomial transformations are basic primitives in quantum algorithms: quantum signal processing and singular value transformation compile univariate polynomials into circuits with query complexity essentially set by degree. Multivariable transformations of noncommuting matrices, however, lack a comparable synthesis theory. We develop a complete constructive theory under joi...

Entanglement Sudden Death: Eberly's Work and the Limits of Local DynamicsTier 3

Entanglement sudden death (ESD), explored through a series of works by Yu and Eberly, supports the notion of entanglement vanishing abruptly and completely at a finite time, even when the underlying open-system dynamics remain smooth. In this article, we revisit the development of ESD from bipartite origins to genuine multipartite entanglement. We first illustrate the canoni...

Analytical results for the Shannon entropy of the critical transverse-field Ising chainTier 3

Local-basis Shannon entropies of critical wave functions contain universal subleading information, but the Shannon point of the critical transverse-field Ising chain is singular in the conventional Rényi approach. We treat it directly at n=1 by representing the complete computational-basis Born distribution as the odd-degree boundary of independent long-range Bernoulli edg...

Universal critical g factor for spin-1/2 Aharonov-Bohm bound statesTier 3

Whether the spin-1/2 Aharonov-Bohm Hamiltonian supports bound states has remained controversial since Hagen concluded that no such states exist for a Dirac particle. Here, we show that Hagen's solution corresponds to a particular member of the one-parameter family of self-adjoint extensions that describe the singular Zeeman interaction, and we identify which member the micro...

Optimal GHZ extraction from MABK violationsTier 3

We determine the least Greenberger-Horne-Zeilinger (GHZ) extractability compatible with a Mermin-Ardehali-Belinskii-Klyshko (MABK) Bell score for every number of parties greater than two. Extractability is the largest squared overlap with a GHZ state obtainable by separate local quantum channels. Between the biseparable bound and the quantum maximum, the exact minimum is the...

Exact Catalysis Cannot Overcome the Gaussian-Steering Barrier for Remote Wigner NegativityTier 3

Gaussian steering sets a sharp threshold for creating Wigner negativity at a distance. A measurement by Bob can make Alice's part of a shared Gaussian state Wigner negative only if Alice can steer him with Gaussian measurements. We ask whether multiple copies, ancillas, or catalysts can lift this requirement when Alice is restricted to Gaussian operations. We introduce the s...

Harnessing Post-selected von Neumann Measurements to Strengthen Entanglement and Quantum Signatures in Coherent StatesTier 3

We investigate how post-selected von Neumann measurements modify the nonclassical properties of two-mode entangled coherent states (ECSs). From the conditional pointer state, we characterize squeezing, photon statistics, intermode correlations, entanglement, fidelity, and post-selection probability. Anomalous weak values with moderate coupling enhance squeezing, antibunching...

An unified approach for the (inverted) quantum harmonic oscillator and the Berry-Keating hamiltonianTier 3

We propose an unified view to three well known quadratic Hamiltonians widely considered in quantum mechanics, i.e. those of the harmonic oscillator, of the inverted harmonic oscillator, and the Berry-Keating Hamiltonian. We describe an unified approach to determine the discrete spectrum of these operators, and to deduce their (generalized) eigenstates. We also look at these...

A 3D-Printed GHz Microwave-Resonator Paul Trap for Electron Confinement and Millisecond Spin-Qubit CoherenceTier 3

We report a 3D-printed microwave-resonator Paul trap that operates at the GHz frequencies required for electron confinement while preserving an open geometry suitable for laser access and imaging ion Coulomb crystals. The resonator exhibits moderate quality factors of approximately 1000, enabling large confining electric-field amplitudes at low input power, and is in good ag...

Relative-Entropy Flow Across the Page TransitionTier 3

We develop a computational framework for the quantum relative entropy based on the replica trick and apply it to analyze the evaporation process method of Jackiw-Teitelboim black holes. We show that the relative entropies between the exact radiation state and the Hawking saddle state and the replica wormholes saddle state quantify information-theoretic costs inherent to coar...

Space-Time Electron Wave Packets with Tunable Skyrmion TexturesTier 3

Space-Time Wave Packets (STWPs) have enabled numerous nontrivial properties, such as tunable group velocities, nondiffraction and nonlocal spin textures in optical fields. However, this has not been properly studied in matter waves. Here, we investigate free-electron STWPs, which are propagation-invariant and group-velocity-tunable matter wave packets, constructed by constra...

Perfect state transfer on mixed graphs: complete classes and transfer timesTier 3

For perfect state transfer (PST) on unweighted mixed graphs, we classify the normalized transfer times of complete PST classes. A finite set Λ⊂R/Z containing zero occurs at a nonstationary periodic vertex if and only if cos(2π(x-y))∈Q for all x,y∈Λ. Every admissible set has a connected oriented realization. We also classify the possib...

Symmetry protected quantum many body scars through half-gaugingTier 3

We study the interplay between symmetry defects insertion and the phenomena of quantum many body scarring. We exploit a class of models obtained from an embedding mechanism that defines a stochastic matrix form hamiltonian, hosting zero energy many body scarred states. Such models display an interesting playground to explore the consequences of dualities, half-gauging operat...

Boosting the photon bunching of classical light via a modified Fabry-Pérot cavityTier 3

We proposed to boost the photon bunching effect of classical light via a modified Fabry-Pérot cavity with one of the cavity mirrors being replaced by a spatial light modulator, through which multiple independent transverse modulations, each was to encode independently spatially correlated phase on the wave front of the light field, was cascaded in sequence in the longitudina...

Measurement Complexity of Quantum Compressed SensingTier 3

Conventional compressed sensing (CS) has a measurement lower bound of M = Ω(K log(N/K)) under non-adaptive measurements. Recent experiments on quantum compressed sensing (QCS) have reported numbers of measurements below this classical lower bound. In this work, we establish lower bounds on the measurement complexity of QCS from an information-theoretic and quantum-physical p...

Operational quasiprobability formulation of non-signaling in time for macrorealism violationsTier 3

In this paper, we introduce the concept of quasi non-signaling in time (QNSIT), which extends non-signaling in time (NSIT) to quasiprobability distributions. QNSIT requires that the marginals of the quasiprobability distribution under consideration at intermediate times remain unperturbed by the measurement back-action induced by a sequence of quantum measurements. Associate...

Total Ordering of Resources: A Quantum-Classical SeparationTier 3

A central goal in quantum information science is understanding which physical states can be converted into others. The ideal scenario would be a totally ordered system, where every state can be ranked by a single value, and a higher-ranked state can always be converted into a lower-ranked one. Such an ordering would provide a complete description of state convertibility, mak...

Memory Separations from a Collective-Spin Quantum RegisterTier 3

A spin one-half driven only by total-spin operators generates a renewal process in which one interevent time n^(ast) is forbidden while all others occur. No classical hidden Markov model reproduces it with fewer than 1+√(n^(ast)) states, an unbounded separation whose only resource is one relative phase of π. With K amplitudes the same interference yields $K(K{+}1)/...

Broadband Telecom Entanglement from an All-Fiber Type-0 Sagnac SourceTier 3

We demonstrate a compact, practical all-fiber source of non-degenerate telecom-band polarization-entangled photon pairs assembled from off-the-shelf components. The compact fiber-integrated architecture is designed to be affordable, straightforward to assemble and align, and compatible with existing optical-fiber infrastructure. Photon pairs are generated through type-0 spon...

Cyclic triorthogonal codes in prime dimensionTier 3

We study cyclic triorthogonal codes in prime dimension p, on which a transversal third-level diagonal gate acts as a logical non-Clifford gate. For odd p, we use a definition of triorthogonality that does not require self-orthogonality. For cyclic codes of length coprime to p, triorthogonality reduces to a sumset condition on the spectral support, which makes exhaustiv...

Squeezed light from a semiconductor amplifierTier 3

The possibility of generating light in a squeezed quantum state during saturated light amplification in a semiconductor amplifier is theoretically analyzed. Due to four-wave mixing process during amplification, weak components of the spontaneous emission of the medium with symmetric frequency shifts relative to the strong amplified wave acquire the quantum properties of two-...

Divisibility of Non-Invertible Quantum Dynamics in the Heisenberg PictureTier 3

We study divisibility of finite-dimensional quantum dynamics in the Heisenberg picture when the dynamical maps need not be invertible. Heisenberg divisible dynamics determines unique reduced propagators on the accessible operator systems, and Heisenberg CP-divisibility is shown to be equivalent to an operator-norm monotonicity. Although each reduced propagator admits a unita...

Horizon-Scale Corrections to Black Hole Geometry from a Conserved Quantum AtmosphereTier 3

Black holes are usually described either as classical geometries on which quantum fields propagate or as objects whose complete quantum description lies beyond semiclassical gravity. Hawking radiation already shows, however, that a black hole is not an exactly isolated system: the horizon carries a thermal scale and, after coarse graining, may be associated with fluctuations...

Quantum Data RulerTier 3

A ruler reads an unknown length against a calibrated scale. The quantum data ruler reads a matrix element of an unknown state against the signal of a known reference, from their ratio. It is exact for any Hamiltonian and any time, since transition operators change by a state-dependent constant times one function of time, removing the vanishing-signal limit. The readout is un...

Quantum telescopy with realistic anti-correlated optical fields as referencesTier 3

Quantum telescopy, proposed by Grottesman et al., uses spatially entangled single-photon states to modify HBT stellar interferometry, potentially surpassing Michelson interferometry in resolution without baseline limits. However, finite source bandwidth, non-unit efficiency, detector response times, and celestial light bandwidth all affect its effectiveness. In this work, we...

Spontaneous Hawking Radiation from Dynamical Black-Hole Formation in Quantum Spin SystemsTier 3

We show that Hawking radiation spontaneously generated by dynamical black-hole formation can be realized in a local quantum spin model. Starting from the ground state corresponding to the early-time vacuum, with no initially prepared excitations, we follow the dynamics induced by the evolving geometry. In the corresponding continuum quantum field theory, Hawking particle cre...

Convergence Without Finite Exactness in the Eigenstate Quantum BootstrapTier 3

The eigenstate quantum-mechanical bootstrap can converge to the physical moment set while remaining nonexact at every finite order. We prove this for a one-dimensional quasi-exactly solvable sextic oscillator at explicitly known eigenvalues, including excited levels. At every finite order, the lower and upper bounds on u^2 remain strictly below and above its physical value...

QuantumGate and NEC GCC Partner to Deploy Sovereign Post-Quantum Cybersecurity Across UAE Critical InfrastructureTier 2

QuantumGate and NEC GCC are partnering to implement sovereign post-quantum cybersecurity solutions across critical infrastructure and telecommunications in the UAE. The collaboration will deploy QuantumGate's cryptographic software, including QSphere, with NEC GCC leading systems integration. This initiative supports national quantum security directives to protect governm...

SEALSQ Leads $10 Million PIPE Investment in WISeSat to Accelerate Post-Quantum Space Cybersecurity InfrastructureTier 2

SEALSQ has invested $10 million in WISeSat.Space through a PIPE financing, acquiring shares at $10.79 each. This investment, completed on October 1, 2026, aims to accelerate the deployment of WISeSat.Space’s LEO satellite constellation and integrate SEALSQ’s post-quantum cybersecurity infrastructure. Both companies operate as subsidiaries of WISeQey Corp, with the collabo...

QuantumCT Opens New Haven Innovation Hub to Build Connecticut’s Quantum Technology EcosystemTier 2

Insider Brief PRESS RELEASE — QuantumCT celebrated the opening of its new home at 101 College Street, establishing a central hub for building Connecticut’s quantum technology ecosystem and moving scientific discoveries from the laboratory into practical applications. By bringing together researchers, entrepreneurs, startups, corporate partners, students, and workforce...

SEALSQ Leads $10 Million PIPE Investment in WISeSat.SpaceTier 2

Insider Brief PRESS RELEASE — SEALSQ Corp (NASDAQ: LAES) (“SEALSQ” or “Company”), a company that focuses on developing and selling Semiconductors, PKI, and Post-Quantum technology hardware and software products, today announced that it led a $10 million private investment in public equity (PIPE) in WISeSat.Space Holdings Corp. (Nasdaq: SAIQ) (“W...

FAU Receives $200,000 NIST Award for Quantum Cybersecurity WorkforceTier 2

Insider Brief PRESS RELEASE — As quantum computing advances, it is creating new cybersecurity challenges that will require a workforce trained to protect critical systems and infrastructure. Yet few workforce development programs provide hands-on training that integrates quantum computing, cybersecurity and critical infrastructure. Florida Atlantic University’s College...

Quantum algorithms for four problems in density peak clusteringTier 3

Clustering is a fundamental task in unsupervised learning. The goal is to partition unlabeled data into clusters such that similar elements are assigned to the same cluster, while elements in different clusters are dissimilar. We propose a quantum Monte Carlo approach to density estimation, a key routine in density peak clustering. Building on this approach, we develop quant...

Complexity of self-consistent entanglement certificationTier 3

In recent work Phys. Rev. X 16, 031057 (2026), we proposed a self-consistent approach to entanglement certification based on generalized noncontextuality. It requires no prior characterization of the measurement devices and, given access to all local measurements, can certify every entangled state in a Bell circuit. Here, we study the complexity of this protocol in a finite...

Energy-constrained two-way capacity bounds for noisy Gaussian channelsTier 3

A gap between achievable rates and converse bounds persists for energy-constrained bosonic communication in the presence of excess noise. We derive a unified adaptive weak-converse bound for thermal attenuation, noisy amplification, and additive Gaussian noise under an unconditional mean transmitted-photon-number constraint. The bound applies to arbitrary adaptive protocols...