August 21, 2026

Programmable cavity QED with a fiber-integrated atomic array

Strong atom-photon interactions in optical cavities are a key resource for quantum information processing, quantum networking, and the exploration of quantum optical effects. Optical tweezer arrays offer scalable, site-resolved control of neutral atoms, but their integration with high-cooperativity cavity QED systems remains challenging. Here we combine a twelve-site ^(87)...

Logarithmic depth compression of Heisenberg Hamiltonian simulation by fan-out parallelization, with built-in error detection

Noisy intermediate-scale quantum computers are constrained by circuit depth, while product-formula simulation of spin systems leads to narrow and deep circuits. Here we introduce a fan-out-based gadget compiler that trades circuit depth for width in simulations of Heisenberg-type nuclear magnetic resonance (NMR) Hamiltonians. Each logical spin is encoded into a small repetit...

Hybrid Qubit-Rotor Quantum Systems: Clifford Structure, Universal Control, and Applications

A U(1) quantum rotor pairs a periodic angle with an integer-valued conjugate momentum, and occurs in molecular rotation, superconducting phase-charge circuits, and compact gauge fields. Coupling such a rotor coherently to qubits gives a hybrid register whose control structure is not inherited from either the oscillator-qubit or the qudit case. We develop a Clifford theory,...

Characterization of a damping channel as a mixture of amplitude damping and anti-damping channels of different parameters

Non-unital noise is a fundamental feature of open quantum systems, governing energy exchange and inducing state translations on the Bloch sphere. While such translations can be useful for tasks such as state preparation and channel capacity, unital dynamics where no translation occurs are often preferred in quantum information processing, particularly for error correction. P...

Large Scale Entanglement Structure Detection in 100-Qubit Systems via Local Joint Measurements

Identifying the entanglement structure of a many-body quantum state, namely how its constituents partition into unentangled blocks, is a central task in quantum information science, yet conventional tomography scales exponentially with system size. Here we introduce a scalable framework that recognizes large-scale entanglement structures directly from local correlation finge...

Architecture and Compilation Co-Design for High-Rate Quantum Product Codes on Neutral Atom Arrays

Achieving fault-tolerant quantum computing at a practical scale demands quantum error correction (QEC) codes with high encoding rates. Quantum low-density parity-check (qLDPC) codes emerge as a promising candidate, especially given the rise of neutral atom arrays that provide dynamic long-range connectivity via atom movements. In general, synthesizing valid and efficient phy...

Vacuum viscosity and relativistic inertia: Motion of a massive object with charged internal degrees of freedom interacting with a classical field

Our present investigation into a rather rudimentary problem is motivated by two classes of problems studied since the 70's, cosmological particle creation and its more accessible analog, the dynamical Casimir effect on the one hand, and quantum friction a neutral atom moving along a dielectric surface would experience, on the other. The backreaction effects of produced parti...

Reinforcement LearningtoHarness Approximation Errors for Long-Time QuantumSimulation

Accurate digital quantum simulation at long times is limited by the accumulation of errors inherent to approximate simulation. Here we introduce RL-Trotter, a reinforcement-learning framework that treats unavoidable approximation errors as resources for error correction rather than merely imperfections to suppress. We show that low-dimensional information from conservation l...

The ebbs and flows of quantum learning and sensing

What is the relation between subsystem quantum complexity and the emergence of computationally useful structure? We address this by studying a family of minimally tunable postvariational quantum circuits, and show how spectral nonflatness and metrological response directly control the ensemble-typical information processing power. This unveils an intermediate "learning phase...

Shadow models of a quantum model for cloud cover and the influence of finite sampling noise

Quantum computing is a quickly growing field that is promising various advantages compared to conventional computing. However, currently stand-alone quantum applications are scarce and hybrid (quantum-classical) computing is needed, especially in quantum machine learning (QML). Due to current limitations of quantum computing hardware and the coupling between HPC and quantum...

Resource-Efficient Bio-Molecular Docking on a NISQ-era Digital Quantum Computer

Molecular docking is a vital computational task in drug discovery, wherein the objective is to efficiently identify optimal binding poses between a ligand and a target receptor protein. Due to the combinatorial explosion of possible binding configurations, docking of large and flexible molecules remains a computationally intensive problem, especially at scale. Early studies...

Distributed Variational Quantum Eigensolver: Embarrassingly Parallel strategies on NISQ

Variational Quantum Eigensolver requires many circuit executions, making it ideal for distributed parallelization. However, heterogeneous noise in NISQ devices can skew results and efficiency. Using the CUNQA platform for emulation of virtual QPUs, we evaluate three embarrassingly parallelization strategies (shot-level, circuit-level for gradients and observables and candida...

TT-net: Quantum Inspired Tensor Network Denoising in Conditional GANs

Developed as a workhorse for classical simulations of quantum algorithms and quantum many-body systems, Tensor Network methods have entered the scientific mainstream in quantum physics. Among various types of tensor networks, Tensor Trains (commonly know as Matrix Product States in the quantum computing community) have already found applications in machine learning. These me...

Crypto4A Achieves World-First FIPS 140-3 Level 3 Validation for Quantum-Safe HSM Module

Canadian cybersecurity developer Crypto4A Technologies Inc. has received NIST FIPS 140-3 Level 3 validation for QASM™, the core cryptographic module integrated into its QxHSM™ hardware security module platform. Supporting the full suite of NIST-standardized Post-Quantum Cryptography (PQC) algorithms, the certification marks the first time a quantum-safe HSM has achieved L...

Allot Leads Founding Industry and Academic Consortium to Launch Israeli Post-Quantum Communications Initiative

Cybersecurity and network intelligence vendor Allot Ltd. (NASDAQ: ALLT) has been appointed founding member and Chair of Israel’s newly established Post-Quantum Communications (PQC) Consortium. Supported by the Israel Innovation Authority's (IIA) Technological Infrastructure Division, the national consortium brings together multinational technology leaders, defense contrac...

Competing triangular and stripe supersolid orders in a dipolar quantum gas

Supersolids are exotic quantum states in which long-range phase coherence coexists, and may interplay, with emergent spatial orders. A particularly rich phase diagram featuring several competing spatial orders is predicted for dipolar supersolids with two-dimensional crystals, yet the experimental observation of this structural variety has remained limited. Here we experimen...

Quantum-mechanical wave functions in singular potentials: linear and nonlinear states

It is known that the attractive singular inverse-square potential gives rise to the critical quantum collapse in the framework of the three-dimensional (3D) linear Schroedinger equation. This article summarizes theoretical results which demonstrate suppression of the collapse, caused by this singular potential, and the creation of the otherwise missing ground state (GS) in a...

Rigetti Establishes Dedicated Systems Delivery Organization to Scale On-Premises Deployments

Superconducting quantum hardware developer Rigetti Computing, Inc. (Nasdaq: RGTI) has reorganized its operating structure to separate commercial system deployments from core quantum processor R&D. The company has established a dedicated Systems Delivery organization to manage manufacturing operations, commercial sales, and customer-facing engineering, while consolidat...

Dirac Labs Raises $1.8M Pre-Seed Round to Scale Diamond-Based Quantum Navigation Sensors

University of Wisconsin-Madison spinout Dirac Labs Inc. has raised $1.8 million USD in pre-seed funding to prototype and field-test its diamond-based quantum positioning sensors. Led by venture firm TitletownTech (a joint initiative of Microsoft and the Green Bay Packers), the round included participation from Automotive Ventures, Riceberg Ventures, quantumEDGE Ventures,...

Superpositions Partners with EBU Luxembourg to Integrate Quantum Workflows into Business Curricula

European quantum software company Superpositions has entered into a strategic educational partnership with the European Business Institute of Luxembourg (EBU) to power its Q-Ready academic initiative. Under the agreement, EBU is incorporating quantum computing and hybrid quantum-classical algorithms into its business school curriculum, providing students with direct hands...

FormationQ and STFC Hartree Centre Partner to Drive Enterprise Quantum and AI Adoption in the UK

Quantum enablement company FormationQ and the STFC Hartree Centre—part of the Science and Technology Facilities Council (STFC) and UK Research and Innovation (UKRI)—have announced a strategic partnership to accelerate the commercial adoption of quantum computing, artificial intelligence (AI), and high-performance computing (HPC) across UK industry, public sector, and rese...

EBU and Superpositions Partner to Add Quantum Computing to Business Education

Dirac Labs Raises $1.8M for Quantum Navigation Sensors

Group-theoretic treatment of strong light-matter coupling with an arbitrary number of excitations

Strong light-matter interactions in optical microcavities give rise to hybrid light-matter states known as polaritons. While actively used in modern technologies, theoretical descriptions of such systems are often restricted to the single-excitation case, limiting their ability to capture many-excitation physics and hindering further technological advancements. Here, by expl...

A Protocol for Shielding-Enhanced Loading of Single Polar Molecules into Optical Tweezers

We propose the high-fidelity preparation of single bosonic molecules in optical tweezers starting from small tweezer-trapped molecular ensembles. Our scheme combines a static electric field and a microwave field to generate strong, tunable, anisotropic interactions that shield the molecules against two-body collisional loss. We show that this shielding eliminates all long-ra...

Imaging the vacuum fluctuations of a quantum field

Heisenberg uncertainties lead to inevitable fluctuations in the measurement outcomes for quantum-mechanical observables. For quantum fields, these uncertainties result in random spatial structures in snapshots of a field, even when the field is in its ground (vacuum) state. Such `vacuum fluctuations' are at the heart of a wide range of phenomena, from spontaneous decay proce...

Coherent states in quantum billiards constructed in the basis of the continued eigenfunctions

In the article a new approach to construction of generalized coherent states in quantum billiards is proposed. The coherent states are defined as the projections of a Gaussian wave function on the basis of the eigenstates of the quantum billiard, continued outside. The continuation is built as the solution of the equivalent Balian--Bloch equation, defined on the entire mat...

Parallel Quantum Advantage with Limited Adaptivity Requires Structure

Aaronson and Ambainis (Theory of Computing, 2014) conjectured that quantum query algorithms admit efficient almost-everywhere classical simulation: for any T-query quantum algorithm, its acceptance probability can be approximated on a (1-δ) fraction of inputs, up to ε additive error, using poly(T, 1/ε, 1/δ) classical queries. At a high level, the conjecture...

Analytical Solutions of the Generalized Klein-Gordon Oscillator in Som-Raychaudhuri Space-Time via the Extended Nikiforov-Uvarov Method

In this study, we present an analytical approach based on the extended Nikiforov-Uvarov method to solve the generalized Klein-Gordon oscillator in the presence of a uniform magnetic field within the Som-Raychaudhuri space-time. Exact eigenstate solutions are obtained for two distinct potential models, namely the linear potential and the Cornell potential. The corresponding e...

Learning Potts Models and Z_3 Toric Codes: Higher and Ordinary Nishimori Criticality

Motivated by a previous Ising study, we identify a ithigher Nishimori line in the learning phase diagram of the 2D q-state Potts model (2 < q≤4) under bond-energy measurements. This ithigher Nishimori line meets the critical temperature line of the Potts model, in a ithigher Nishimori critical point -- a tricritical point at finite inference stren...

Jamming Extensions of Quantum Correlations Lead to Hidden Superluminal Signaling

Relativistic causality in certain spacetime configurations permits jamming - superluminal causal influences that nevertheless do not enable superluminal signaling. We fully characterize the correlations compatible with relativistic causality (RC) by extending the operator framework of PRL 104, 140404. When the underlying state is required to be quantum, we prove that any non...

Nonthermal Dynamics of a One-dimensional Rydberg-atom Chain with Constraint Four-body Interactions

We investigate dynamics of a linear chain of Rydberg atoms driven by a constrained four-body interaction, where two neighboring atoms are excited simultaneously from the electronic ground state |0⟩ to Rydberg state |1⟩ only when their closest neighbors are in |0⟩ state. By employing an ansatz for the many-body ground state, the low-energy Hamiltonian...

Rigorous existence and location of quantum phase transitions in lattice Hamiltonian systems

We extend the analysis of the class of quantum phase transitions (QPTs) that can be interpreted as condensations in state space, first introduced in [M. Ostilli and C. Presilla, J. Phys. A 54, 055005 (2021)], by generalizing the arguments of [M. Ostilli and C. Presilla, Phys. Rev. Lett. 127, 040601 (2021)] to prove the existence and determine the location (via simple bounds)...

Quantum Dissipative Paraelectricity

Whether a quantum system with a double-well effective potential undergoes spontaneous symmetry breaking depends not only on the potential landscape but also on the kinetics and the coupling with additional degrees of freedom. Here we introduce a quasi-exactly solvable model to study this problem in the context of ferroelectrics, with results that apply to a broad class of qu...

Proper Learning of Shallow All-to-All Quantum Circuits

This work considers a variation on the problem of learning shallow quantum circuits. Given query access to the circuit, as well as knowledge of its gate layout, we consider the task of learning the specific gates used in the circuit, producing an operationally-equivalent circuit matching this structure. Building on recent work for learning Haar random brickwork circuits, we...

A Zoology of Quantum Turing Patterns

We explore quantum Turing pattern zoology, where the same Lindblad equation supports a morphology atlas of stripes, spots, holes, labyrinths, and defects. The stable stripe species provides a quantitatively controlled case in which morphology and Gaussian witness loss separate parametrically. In particular, visible Turing stripes can remain after two Gaussian witness margins...

Boltzmann counting in Hilbert space

We introduce a geometric entropy for quantum preparations, defined as the logarithm of the Hilbert-space volume of pure states compatible with a given set of constraints. This construction extends Boltzmann's counting perspective to the quantum setting, where compatible states need not be orthogonal and the relevant notion of "number of states" is naturally replaced by a vol...

Preparation of Large Fock States in Resonators with High Probability

Large Fock states are important resources for bosonic quantum information and quantum-enhanced metrology, but preparing them with high probability at large excitation numbers remains challenging, as deterministic methods become increasingly control-intensive, while measurement-based approaches typically suffer from low heralding probabilities. Here we propose a protocol that...

SAKE: Spectral Autodiff Kernel Expansion for Geometric Liouvillian Transport. A Differential-Geometric Framework for Response Transport in Quantum Dynamical Systems

We introduce the Spectral Autodiff Kernel Expansion (SAKE), a differentiable computational framework for transporting nonlinear spectroscopic response between neighboring quantum dynamical models. Rather than recomputing multidimensional spectra independently for each Hamiltonian or Liouvillian, SAKE constructs local transport expansions about a reference model by combining...

Geometric Control of Cat States in High Harmonic Generation

High-harmonic generation (HHG) provides a powerful platform for exploring the interaction between intense laser fields and matter on ultrafast timescales. Beyond its conventional description in terms of emitted radiation and electron dynamics, a fully quantum treatment of HHG reveals that the nonlinear light-matter interaction can modify the quantum state of the driving fiel...

Counterexamples to the fractional coloring conjecture for triply efficient shadow tomography

Fractional graph colorings are useful for the Shadow tomography of Pauli observables. In practice, it is desirable that any experimentally interesting set of Pauli operators has a small fractional chromatic number χ_f for its anticommutation graph. Conjecture 13 in King, Gosset, Kothari, and Babbush [PRX Quantum 6, 010336 (2025)] states that if B_ε(ρ) is the set...

Squeezed- and coherent-state quantum key distribution over a deployed hybrid fibre-free-space channel

Quantum networks will combine optical fibre with free-space links, yet continuous-variable quantum key distribution (CV-QKD) has been developed predominantly for one medium or the other, while operation across concatenated fibre-free-space channels remains largely unexplored. The two media impose contrasting requirements: fibre transmission is stable and permits long process...

Nonzero-temperature vibronic spectra of polyatomic molecules from a zero-temperature classical trajectory

By combining coherence thermofield dynamics with the single-Hessian approximation, we enable simulations of low- to medium-resolution vibronic spectra of weakly anharmonic systems at nonzero temperatures, at negligible additional cost relative to zero-temperature calculations. Single-Hessian coherence thermofield Gaussian wavepacket dynamics is exact in any harmonic potentia...

Kibble--Zurek Scaling in the Dicke Model at Mesoscopic Scales

The Dicke model is a paradigmatic setting for collective light-matter physics and the superradiant phase transition. Yet extracting the critical exponents is challenging at experimentally accessible mesoscopic sizes, due to the slow divergence of the correlation time under all-to-all coupling and a photon-loss-driven crossover to a distinct dissipative universality class. He...

PPT Entanglement with Correlated Catalysis: Monotones and Irreversibility

Quantum catalysts can overcome otherwise impossible quantum state transformations without being consumed, and allowing them to become correlated with the output makes this assistance substantially more powerful. This raises a fundamental question for entanglement theory: which limitations on state manipulation remain when such correlated catalysts are freely available? We an...

Radial Convex Geometry of Quantum States and Its Relation to Best Separable Approximation

We study bipartite entanglement from the convex geometry of quantum states. Taking the maximally mixed state as a reference point, we define a geometric entangled-space quantity G(ρ)=[1-L(ρ)]/L(ρ) from the relative positions of the separable and quantum-state boundaries, and introduce a relative entanglement degree Q(ρ)=[(1-p)/p]/G(ρ) by comparing it with the robustness...

Wide-field mid- to long-wave infrared imaging with undetected photons

Quantum imaging with undetected photons (QIUP) allows an object to be probed at mid-infrared frequencies by only measuring interference in the visible range, thus leveraging silicon camera technology. We show that non-collinear phase-matching in a silver thiogallate (AgGaS_2) crystal enables wide-field QIUP in the wavelength range of 6-10 μm (1670-1000 cm^(-1)). A comb...

Bayesian inference and retrodiction for faithful states on von Neumann algebras

Retrodiction is the act of inferring a cause from its effects, the most common example of which is Bayesian inference. Retrodiction can be defined by its structural process-theoretic properties, which are mathematically captured by category theory. This categorical definition of retrodiction has recently been shown to potentially isolate the Petz recovery map as a unique uni...

Dynamical one-from-many quantum metrology: Sum rule and matrix-free precision bound

Practical quantum single-parameter estimation is rarely a pristine task; it almost invariably involves nuisance parameters, casting it as a one-from-many problem. Existing approaches to this problem rely on multi-parameter metrology, reducing the matrix quantum Cramér-Rao bound to obtain scalar quantum precision limits. However, these methods are often hampered by the demand...

Resonance Raman spectroscopy from ab initio Hagedorn wavepacket dynamics

We present a practical, ab initio time-dependent method using Hagedorn wavepackets to simulate resonance Raman (RR) spectra of polyatomic molecules. Hagedorn functions---Gaussians multiplied by specific polynomials---are used to represent RR initial and final states because these functions are exact solutions to the time-dependent Schrödinger equation for at-most-quadratic p...

Entangling two qudits of arbitrary dimension through light-atomic Faraday interaction

The paper investigates entangling operations acting on two qudits of arbitrary dimension, with one encoded in the states of a spatially multimode optical field, the other in those of atomic collective spin coherence, both carrying orbital angular momentum (OAM). We demonstrate the generation of a wide range of entangling operations within a protocol consisting of two Faraday...

Optomechanically induced transparency in the presence of a strong Duffing nonlinearity

We consider the combined effect of a Duffing nonlinearity and the optomechanical interaction on the cavity density of states (DOS), which is directly observable in optomechanically induced transparency (OMIT) experiments. Both nonlinearities introduce the same type of interaction between polaritons, producing a distinct feature in the optical response. We derive the resonant...

Constant-round quantum advantage in communication complexity for total functions

We show that there exists a total function for which there is a polynomial gap between the randomized and the constant-round quantum communication complexity. Previously, such a separation was known only for quantum protocols using polynomially many rounds.

An Irreducible Quantum Advantage in Aligning World Models with Reality

World models provide digital simulacra of the true world, allowing agents to be trained and tested before costly real-world deployment. At each time step, they receive an action and generate an observation and reward matching the statistics of the true world. In complex environments where present outcomes depend on events far in the past, this requires memory. One might expe...

Gradient flow towards quantum states with ideal quantum geometry

We propose a gradient-flow method for quantum states in lattice models, generated by an action consisting of the quantum-metric and the square of the Berry curvature. These two terms drive the spectral projector toward Bogomolny saturation and uniform Berry curvature, respectively. We show that, due to a no-go theorem for finite-dimensional projectors, the two conditions can...

AI Coding Assistants are Getting Smarter

By Doug Finke Last year, we published an article titled Quantum SDKs are Dying, Long Live Quantum AI SDK describing how the classical computing concept of "Vibe Coding" is entering the quantum programming space. (Perhaps we should call it Vibe Qoding!) We continue to see this trend accelerate and believe it will profoundly impact the [...]

Caltech Researchers Measure Conformal Field Theory Spectra on a Neutral-Atom Quantum Simulator

Credit: Caltech/Gyohei Nomura A physics collaboration led by Caltech—combining the experimental laboratory of Professor Manuel Endres and the theoretical group of Professor Jason Alicea, alongside theorists from Université Paris-Saclay and the Technical University of Munich—has performed the first direct experimental measurement of finite-size energy excitation spectra pr...

EigenQ and Silicon Valley Acquisition Corp. Advance $3B SPAC Merger via Form S-4 Submission

Quantum technology developer EigenQ, Inc. and special purpose acquisition company Silicon Valley Acquisition Corp. (Nasdaq: SVAQ) have confidentially submitted a draft registration statement on Form S-4 to the U.S. Securities and Exchange Commission (SEC). The filing marks a formal regulatory step toward completing their previously announced business combination, which va...

Who Will Actually Use Quantum Computers? Study Identifies 11 User Types

ORNL Quantum Computing User Forum Highlights Quantum-HPC Research

Texas Quantum Strategy Takes Shape at UT Dallas Summit

Quanome Technologies Forms Council to Advise on Quantum Technologies

Pasqal and Bleichroeder Set August 25 Shareholder Vote on Business Combination

Symmatrics Appoints Joe Reddix as Vice President of Federal Sector