August 6, 2026

Fast Quantum Interconnects via Neutral Atom Ensembles

Distributing entanglement between distant qubits is a crucial element of scalable quantum computing. Here, we describe a scalable quantum interconnect that generates remote entanglement at rates approaching those compatible with two-qubit gates of current neutral-atom quantum processors. The proposed approach exploits the strong dipole-dipole interactions between atomic Rydb...

Neutral Atom Quantum Computing: Principles, Routes, Progress, and Challenges

Neutral atom quantum computing utilizes laser-trapped neutral atoms as qubits and realizes quantum logic gate operations through Rydberg-state interactions. In recent years, it has become one of the most vibrant directions in quantum computing hardware. This paper systematically reviews the working principles of neutral-atom quantum computers, including qubit encoding, atom...

Universal linear manipulation via routing and projective measurements

Multiport interferometers with N ports are basic devices in both classical and quantum photonics. Ideally, they implement a linear unitary transformation between the input and output electric field vectors with N components, each associated with a spatial mode of classical coherent light or a single photon. Standard designs for a fully reconfigurable universal multiport...

Diffusive Speed Limits for U(1)-Covariant Quantum Error Correction

Fast preparation of quantum error-correcting codes is essential for scalable quantum memories, but geometric locality and U(1) charge conservation impose an unavoidable transport constraint. We combine exact complementary-channel geometry, charge-sector Haar analysis, and a gate-resolved connected-moment expansion to study one-dimensional covariant encoders under flagged e...

Quantum States Protection under Environmental Noise

All realistic quantum systems are inevitably in contact with the environment. Suppressing theimpact of environmental noise is a critical challenge in cutting-edge quantum technologies. In thiswork, we introduce and systematically analyze a scheme for the protection of quantum states againstamplitude-damping (AD) noise based on the circuit structure called the quantum filter....

Demonstrating advantages of dynamic quantum circuits on a hybrid superconducting qubit-cavity processor

Dynamic quantum circuits (DQCs) provide a hardware-efficient route to quantum computing by reducing physical-qubit overhead and compressing circuit topology through mid-circuit measurements, qubit reset and reuse, and classical feed-forward control. Here, we demonstrate the advantages of DQCs on a single hybrid superconducting qubit-cavity processor by implementing a hierarc...

Constructive realization of self-referential prediction limits in quantum control: Resource bounds and Gödel-safe architectures

Programmable quantum control systems increasingly rely on predictive modules for certification, real-time feedback, and autonomous decision-making. This development raises a fundamental question: can self-analyzing quantum platforms universally predict their own experimental outcomes? Wolpert formalized a general impossibility of universal self-prediction. Here we translate...

Measurement-induced generation of Schrödinger cat states in cavity QED

Schrödinger cat states, representing coherent superpositions of macroscopically distinguishable states, are indispensable nonclassical resources for continuous-variable quantum information processing. Existing generation protocols typically rely on strong nonlinear interactions, complicated control techniques, or engineered dissipation, posing challenges for experimental imp...

Sharp Continuity of Petz and Sandwiched Rényi Conditional Entropies

We determine the sharp modulus of continuity, in trace distance, of the optimized Petz and sandwiched Rényi conditional entropies for every order α∈[1/2,1). If two bipartite states are within trace distance δ, then both conditional entropies differ by at most 1/(1-α) log[(1-ε)^α +(D-1)^(1-α)ε^α], where ε:= min{δ,1-1/D} a...

Quantum SWITCH-induced non-Markovianity is not entirely quantum

Indefinite causal order extends quantum information processing beyond fixed causal structures, with the quantum SWITCH serving as its canonical realization. By coherently superposing different orders of quantum channels, the quantum SWITCH has been shown to provide operational advantages in communication, computation, metrology, and related tasks. Despite these advances, the...

Coupling Does Not Reduce the Auxiliary-Mode Count for 1/|ω| Spectra in Passive Lindblad Networks

Representing continuous environments by finitely many Markovian auxiliary modes is fundamental in non-Markovian open quantum systems, yet a critical question remains: at a fixed mode budget, can coherent intermode coupling reduce the spectral approximation error? We prove that intermode coupling offers no advantage when passive, number-conserving Gaussian Lindblad auxiliary...

Quantum-information fingerprints of partial dynamical symmetry in the interacting boson model

Partial dynamical symmetry (PDS) is an algebraic structure in which a prescribed symmetry is neither exact nor completely broken: a subset of eigenstates keeps good quantum numbers and remains solvable while the rest of the spectrum mixes. PDS is currently identified from spectroscopic data, band-head energies, level systematics, and B(E2) ratios. We ask whether it also ha...

Measurement-based simulation of lattice gauge theory dynamics with adaptive quantum circuits on a trapped-ion processor

Measurement-based quantum simulation (MBQS)---a recently proposed architecture for simulating lattice gauge theories---implements Hamiltonian dynamics by consuming a model-specific entangled resource state with adaptive mid-circuit measurements, rather than by a gate-based circuit. The local constraints in lattice gauge theories are mirrored by the higher-form symmetries of...

D-Wave and Nasdaq Verafin Partner to Develop Quantum Applications for Financial Crime Detection

Quantum computing developer D-Wave Quantum Inc. (NASDAQ: QBTS) has signed an agreement with Nasdaq Verafin—the financial crime management technology unit of Nasdaq—to evaluate the use of quantum-hybrid computing in combating financial crime. The collaboration focuses on leveraging D-Wave’s quantum annealing systems and hybrid machine learning workflows to enhance predicti...

A fractional quantum Hall factory on quantum processors: constant-depth preparation of clustered non-Abelian states

Non-Abelian anyons arise as exotic excitations in fractional quantum Hall (FQH) matter and have proved very elusive to realize in conventional platforms. In this work, we show that on a programmable quantum hardware platform, the more exotic FQH excitations are the less costly ones to prepare: clustered non-Abelian FQH states admit parallel quantum preparation circuits whose...

Methods for traceable scanning magnetometry using single nitrogen vacancy centers in diamond: determining orientation, distance and localization

Individual, scannable nitrogen vacancy (NV) centers in single crystal diamond nanostructures enable nanoscale, quantitative imaging of magnetic stray fields. Nevertheless, important parameters like distance between the NV center and the sample and the orientation of the NV high symmetry axis are often not known precisely and enter data evaluation as free fitting parameters....

Quantum annealers as programmable thermal machines

Programmable quantum annealers are used for optimization, probabilistic sampling, and simulation, but their performance is commonly reported without the energy exchanged during computation. Here we characterize the D-Wave quantum annealer as a closed thermodynamic cycle. From initial and final Ising energies and an effective temperature fitted to the output distribution, we...

IonQ and Sandia National Laboratories Sign MOU to Accelerate Quantum Co-Design for National Security Applications

Quantum platform developer IonQ (NYSE: IONQ) has signed a Memorandum of Understanding (MOU) with Sandia National Laboratories to pursue the co-design of quantum information science (QIS) technologies for U.S. national security applications. Operating out of Sandia’s Quantum Demonstration Facility in New Mexico, the public-private partnership will align trapped-ion hardwar...

Thales Introduces Luna 8 Hardware Security Module for Post-Quantum Encryption

French cybersecurity and defense technology firm Thales has launched Luna 8, a next-generation hardware security module (HSM) designed to safeguard enterprise cryptographic infrastructure against emerging quantum decryption threats and high-throughput AI workloads. Powered by a custom-designed Thales cryptographic processor, the hardware appliance provides high-speed key...

Quantum Corridor, Ciena, and Toshiba Validate 1.6 Tb/s Quantum-Safe Encryption on Live Fiber Network

Midwest network infrastructure developer Quantum Corridor, optical networking provider Ciena (NYSE: CIEN), and Toshiba have completed a field trial of high-speed quantum-safe optical encryption across a live commercial network. Conducted on Quantum Corridor’s production fiber network connecting data center nodes between Chicago, Illinois, and Hammond, Indiana, the trial v...

JIJ Raises $5.2 Million, Expands Qamomile Software Platform, and Joins Quantinuum Partner Program

Tokyo-based quantum software developer JIJ Inc. has announced the completion of an 840 million JPY (approximately $5.2 million USD) equity financing round led by Global Brain. The capital raise included participation from multiple funds managed by Global Brain—including the KDDI Open Innovation Fund III, ME Innovation Fund (Mitsubishi Electric), ANA Future Frontier Fund,...

IonQ and EPB Partner to Establish Tennessee Quantum Communications Research Center

Quantum hardware and networking company IonQ (NYSE: IONQ) and Chattanooga electric power and telecommunications provider EPB have announced plans to launch the Tennessee Quantum Communications Research Center. Based in Chattanooga, Tennessee, the research and development innovation laboratory will be directly connected to an operational fiber optic communications network....

Representational separation between unitary and channel quantum generative models via shared classical randomness at shallow depth

Near-term quantum hardware limits circuit depth and often imposes geometrically local connectivity for quantum generative models, restricting the output distributions accessible to shallow unitary Born models. Introducing stochasticity into a unitary quantum Born model can improve the empirical generative performance of the resulting channel model and, for a restricted small...

Imaginarity as a necessary resource for trainability in QAOA

The quantum approximate optimization algorithm (QAOA) tackles combinatorial problems by tuning a quantum circuit in a classical loop, often guided by gradients. We show that the gradient used to tune the circuit's final parameter is bounded by imaginarity, which weights phase relationships between candidate solutions by how strongly the circuit connects them and how differen...

Perfect Games in Dimension-Bounded Communication

Perfect prepare-and-measure games exhibit an all-or-nothing quantum advantage: a quantum system of dimension d satisfies every prescribed winning constraint, whereas a classical d-level message cannot. We establish two structural results for such forbidden-output support constraints. First, every binary-output support game reduces exactly to a conflict graph: perfect cla...

Constructing Non-Hermitian Theories with Tunable Exceptional Points and Controlled State Purification

Exceptional points (EP's) are a hallmark of non-Hermitian quantum systems. We show that momentum-space deformation provides a general design principle for creating and controlling EP's in quadratic many-body Hamiltonians. We identify universal criteria for the momentum sectors to host EP's and the corresponding critical deformation strengths, while revealing that a single mo...

Preparation geometry and slow-sector routing in driven Kerr resonators: an operational spectral theory of Liouvillians

Liouvillian eigenvalues determine decay rates and oscillation frequencies, but not how the corresponding modes are excited, propagated, and detected in a chosen protocol. We develop an operational spectral theory based on matched left and right eigenoperators. Left eigenoperators determine excitation by an input or source; right eigenoperators determine the propagated densit...

Observing the Quantum Compiler through Automatic Experiment Tracking for Qiskit

Understanding the effectiveness of quantum compilation techniques requires visibility into the entire transpilation process, not just the final circuit metrics. This demonstration presents an MLflow-inspired autologging framework for Qiskit that automatically captures compiler provenance, including transpilation stages, pass-level execution data, backend characteristics, com...

Symbol-Oriented Quantum Communication via Temporal-Mode Multiplexing

We introduce and analyze a quantum-assisted classical communication protocol that encodes symbols from a finite alphabet onto temporal modes using the LM05 operation as a building block. The protocol applies a bit-flip gate independently to temporal slots corresponding to message symbols, yielding a tensor product of LM05 operations on parallel channels. This tensor product...

Quantum Bayes Correlated Equilibrium and the Comparison of Quantum Information Structures in Games

Bergemann and Morris (2016) show that one information structure is more informative than another exactly when it induces a smaller set of Bayes correlated equilibrium outcomes in every game. We build the quantum analogue. An information structure becomes a family of density operators indexed by the payoff state, which the mediator observes. We show that obedience is equivale...

From Promise to Practice: Closing the Application Gap in Quantum Computing

Quantum computing is a deep technology whose progress cannot be driven effectively from one direction alone. While the field has developed a growing catalogue of mathematically grounded algorithmic speedups, industrial impact will depend just as much on starting from real industrial decision contexts and working downward to what must be computed, validated and integrated. In...

Complementary Quantum Correlations Are Universal for Qubits

Extracting total correlations from a quantum system usually requires reconstructing its state, whereas many experiments access only a few measurement settings. A possible shortcut is to add the mutual informations obtained from complementary measurements; in dimensions above two, however, this procedure can count the same classical correlation twice. We establish that qubits...

Quantum-Limited Distance Estimation in Three-Dimensional Optical Superresolution

Quantum superresolution reveals that the vanishing of separation sensitivity in conventional imaging below the Rayleigh limit does not necessarily indicate a fundamental loss of information in the optical field. However, the quantum limit for estimating the physical distance between two incoherent point sources in three-dimensional imaging systems and its dependence on the s...

Universal Scaling of the Minimum Error Probability in Qualification of Quantum States

Qualification of quantum states judges which of two sets of quantum states an unknown state lies in, where the two sets are labeled by two distinct parameter regions. We formulate this problem as a composite quantum hypothesis test and uncover universal scaling laws for the minimum error probability for N copies. Taking polarization-direction qualification and purity quali...

Disentanglement in the macroscopic limit

The recently proposed spontaneous disentanglement hypothesis is formulated using a modified Schrödinger equation having an added nonlinear term. The hypothesis is motivated by some outstanding issues in the foundations of quantum mechanics, including the problem of quantum measurement. Spontaneous disentanglement is explored in the current study for the macroscopic limit. Th...

Two-dimensional Toda--Arnoldi correspondence: Holomorphic Krylov geometry and counterdiabatic transport

Although Arnoldi reduction of a generally non-Hermitian Hamiltonian yields an upper Hessenberg matrix rather than the tridiagonal form of Hermitian Lanczos theory, we show that a closed Toda sector survives in its diagonal and subdiagonal coefficients. For a fixed finite-dimensional Hamiltonian and a cyclic state vector deformed holomorphically, the Krylov Gram determinants...

Quantum walker trapped by self-similarity of the Sierpiński carpet

We study the dynamics of a single quantum particle on a finite-size square lattice with a fractal structure resembling the Sierpiński carpet, and compare it to the dynamics on a uniform lattice of the same size. For a particle initially localized at a corner of the lattice, we monitor the probability of finding it near the initial and opposite corners using zone-integrated p...

Motional refocusing for trap-off Rydberg gates

Rydberg entangling gates in optical-tweezer arrays are commonly executed with the trapping light switched off, so every gate contains a release--and--recapture cycle that heats the atomic motion and can ultimately limit circuit depth. We develop a motional refocusing protocol that exactly removes this heating in the harmonic approximation using only programmable intensity sw...

High-cooperativity coupling and spin-resolved extinction of tin-vacancy centers in a diamond-like microcavity

The tin-vacancy (SnV) center in diamond is a promising spin-photon interface for quantum networks, combining favorable optical properties with spin coherence above 1K. Unfolding the full potential requires cavity enhancement to increase photon-emitter coupling efficiency. Here, we demonstrate cavity-enhanced light-matter coupling of SnV centers in a fully tunable Fabry-Pérot...

From normal Lindbladians to non-normal quantum trajectories

Efficient simulation of Markovian open quantum systems remains a central challenge because the density-matrix description grows exponentially with system size. Quantum trajectory methods provide an alternative by replacing mixed-state evolution with stochastic pure-state realizations. Here we investigate this framework for normal Lindblad generators, whose orthogonal eigenop...

Single-eigenstate test of eigenstate thermalization hypothesis via perturbed eigenstate quench

We propose and numerically validate an efficient single-eigenstate diagnostic for the eigenstate thermalization hypothesis (ETH) based on a perturbed eigenstate quench protocol. By introducing a weak random perturbation to an energy eigenstate to break its stationarity, we characterize the time-averaged subsystem evolution speed as a function of the subsystem-to-total system...

Spectral evolution of two-photon emission in microresonators

High-Q silicon nitride microresonators are versatile sources for generating photon pairs via four-wave mixing. We investigate the spectral coherence of this process, tracking the transition from the spontaneous quantum regime to the onset of optical parametric oscillation. By combining time-correlation measurements with phase-sensitive measurements, we continuously monitor t...

Effect of Cross-Spectral Correlations on Qubit Dynamics: Coherence Revival and Relaxation Modulation

We investigate the reduced dynamics of a qubit subject to correlated longitudinal and transverse noise arising from its coupling to a shared bosonic bath. The environmental fluctuations are characterized by a positive-semidefinite matrix-valued spectral density, whose complex off-diagonal elements encode correlations between dephasing and relaxation channels in the frequency...

Efficient Depth--Ancilla Tradeoffs for Hamming Weight Computation and Symmetric Boolean Functions

Hamming weight computation maps an n-bit input to the number of ones it contains. It is a basic subroutine in quantum computing, and the core building block for symmetric Boolean functions, whose value depends only on the Hamming weight of the input. Moreover, symmetric Boolean functions are among the most common primitives in quantum computing. Efficient circuits for both...

Solving Differential Equations Using Continuous-Variable Quantum Annealing

Most existing quantum annealing approaches are formulated for qubit-based architectures. Consequently, applying them to continuous-variable optimization problems requires discretizing the variables, which can incur substantial qubit overhead. Continuous-variable quantum annealing based on bosonic systems has recently been proposed as an alternative framework, in which each o...

Hidden Supersymmetry in Wigner-Yang Quantum Mechanics

We consider a quantum system on the real line obeying a deformed Heisenberg algebra originally proposed by Wigner in 1950. Its explicit coordinate representation was provided by Yang in 1951 and in essence is identical in form with Dunkl's difference-differential operator introduced in 1989 in connection with roots systems of refection groups. Under certain conditions such q...

Engineering Nanodiamonds for Quantum Sensing: Material Constraints at the Nanoscale

Optically addressable solid-state spin defects have emerged as powerful multimodal quantum sensors, with nitrogen-vacancy (NV) centers in bulk diamond providing benchmark quantum control and sensitivity under ambient conditions. Embedding such defects in nanodiamonds (NDs) extends these capabilities to mobile probes capable of accessing complex biological and nanoscale envir...

Impact of molecular orbital localization on quantum computational resources for Hamiltonian simulation: A benchmark study of hydrogen chain systems

We investigate how molecular orbitals used as the basis of wave function expansion and how operator coefficient-based and locality-based Hamiltonian truncation affects the computational cost of Trotter decomposition-based Hamiltonian simulation in one-dimensional hydrogen chain systems. The analysis is performed using both Hartree--Fock canonical molecular orbitals (CMOs) an...

Heralded Non-Gaussian Squeezed-State Inputs for Parity-Detection SU(1,1) Interferometry

Non-Gaussian operations can reshape the photon statistics of continuous-variable probes, but their metrological advantage is meaningful only when heralding probability and photon-number resources are counted consistently. We compare photon subtraction, photon addition, and photon catalysis as input-side heralding operations in a balanced SU(1,1) interferometer with parity de...

Analytic correspondence between multipartite entanglement and quantum phase transitions

We derive an analytic correspondence between multipartite concentratable entanglement (CE) and quantum phase transitions in one-dimensional quantum spin systems. We prove that CE shares the same analyticity structure as generalized order parameters, identifies the same quantum phases, and, for Gaussian ground states, is completely determined by the same single-particle corre...

Equilibrium Thermodynamics of Non-Hermitian Dirac Fermions: Caloric and Magnetic Responses

We establish scaling relations governing the equilibrium thermodynamics of real-spectrum non-Hermitian Dirac fermions in a magnetic field. Assuming thermalization with respect to the quasi-Hermitian Hamiltonian, a similarity transformation maps the system at the same applied field onto a Hermitian Dirac model with reduced velocity, while the Landau-level spectrum also admits...

The Born Representation Theorem and the Unistochastic Theorem

This paper presents self-contained, constructive proofs of two new theorems about stochastic matrices, with direct relevance to quantum theory. The first theorem, herein called the Born Representation Theorem, shows that each entry of any stochastic matrix can be expressed as the trace of a pairwise product of matrices, where the first factor in the pairwise product belongs...

Poisson-Compiled Quantum Singular Value Transformation for Power-Exponential Dissipation

We study quantum implementations of the contraction exp(-T H^α) for H=H^†succeq0 and α>0. Poisson summation provides an exact target--alias--tail decomposition whose Fourier samples are compiled classically into a single Chebyshev polynomial, so the quantum circuit uses polynomial eigenvalue transformation rather than a frequency linear combination of unitaries...

NIST Researchers Demonstrate Entangled Photon Transmission Over Existing Fiber Networks

Guest Post: From the Cosmos to Quantum Computers

Researchers Say New Quantum Encryption Method Can’t Be Copied