September 21, 2026

Diraq and Dell Technologies Partner to Integrate Silicon QPUs with High-Performance Classical ComputingTier 2

Diraq and Dell Technologies have partnered to integrate silicon spin-qubit quantum processors with classical HPC and AI server infrastructure, with Dell deploying an HPC server cluster directly inside Diraq's Sydney lab for ultra-low-latency quantum-classical interconnect and real-time control. The collaboration focuses on hybrid orchestration software for automated qubit...

ReFINE: Scheduling of Distillation and Coding for Rate-Fidelity Tradeoff in Quantum NetworksTier 3

In quantum networks, nodes are connected via sharing of Einstein-Podolsky-Rosen (EPR) pairs, ideally with high fidelity and high rate. However, the fidelity of EPR pairs degrades due to imperfect generation and decoherence errors. Entanglement Distillation is a method that increases the fidelity but operates probabilistically and may destroy all involved EPR pairs upon failu...

IBM Research Demonstrates Hybrid Spacetime PEC to Reduce Error-Mitigation Sampling Overhead by 63×Tier 2

IBM Research has introduced Spacetime Probabilistic Error Cancellation (Spacetime PEC), a hybrid error-handling framework that significantly reduces the sampling overhead in quantum computing. This new protocol combines Probabilistic Error Cancellation (PEC) with post-selected Quantum Error Detection (ED), achieving up to a 63-fold reduction in sampling overhead compared...

NLM Photonics and SilOriX Partner on Silicon Organic Hybrid PhotonicsTier 2

Insider Brief PRESS RELEASE — NLM Photonics and SilOriX, both leaders in silicon organic hybrid (SOH) photonic solutions, today announced that they have entered into a Joint Development Agreement to advance next-generation photonic integrated circuits (PICs) for high-speed, energy-efficient optical communications. SilOriX is a spin-out from the Karlsruhe Institute of T...

Creotech Quantum Leads Project for the Next Generation of Secure Quantum And Optical CommunicationsTier 2

Insider Brief PRESS RELEASE — Creotech Quantum S.A., a Warsaw Stock Exchange-listed company developing and commercializing quantum technologies, has signed an agreement to carry out a project for the European Space Agency (ESA) aimed at developing and demonstrating a new generation of single-photon detectors based on superconducting nanowire technology (SNSPD – Superco...

Microwave dielectric properties of LiNbO_3 and AlN at millikelvin temperatures and single-photon powerTier 3

Efficient bidirectional microwave optical photon conversion is a key capability for scaling superconducting quantum processors into distributed networks. However, achieving the necessary conversion efficiency requires filling a critical knowledge gap in understanding the loss mechanisms of electro optic materials. Here, we characterize the microwave properties of single crys...

Single-atom-based asynchronous photonic interconnect for scalable modular quantum computingTier 3

Scaling quantum computation beyond the capacity of a single quantum processing unit requires quantum interconnects between modular processors. Optical photons are natural carriers for distributing entanglement between these processors. Most loss-resilient protocols use photonic Bell-state measurements based on the linear-optics type-II fusion gate. The resulting entanglement...

Ensemble Dependence of the Critical Exponent at a Quantum Error Correction ThresholdTier 3

In thermodynamics it is common to assume that the choice of ensemble (e.g., micro-canonical, canonical, or grand-canonical) should not affect the underlying physics in the thermodynamics limit. We show that this does not necessarily hold for critical exponents. Examining a simplified model of quantum error correction (single step encoding and decoding by a random unitary) an...

Multiscale Schmidt-Spectrum Bounds for High-Dimensional Entanglement: Geometric Measures and Schmidt-Number WitnessesTier 3

High-dimensional bipartite entanglement depends on how probability is distributed across the Schmidt spectrum, whereas a single reference-state fidelity resolves only one spectral scale. We develop multiscale Schmidt-spectrum bounds that connect geometric measures with quantitative Schmidt-number witnesses. For any partition of a pure-state Schmidt spectrum, several nested V...

USA Rare Earth, Pasqal, and Riven Systems Partner to Advance Quantum ML for Critical Mineral ProcessingTier 2

USA Rare Earth, Pasqal, and Riven Systems are collaborating to develop quantum machine learning (QML) models for separating rare earth elements. This partnership combines Pasqal's quantum computing, Riven's autonomous chemistry lab, and USA Rare Earth's resources to optimize chemical separation, aiming to reduce supply chain dependencies and improve efficiency in processi...

Previously: 2026-09-01, 2026-08-25

Asymptotics for Frequency Redundancies in Quantum Machine Learning ModelsTier 3

The redundancy distribution of the frequency spectrum has been shown in the literature to impact the expressivity and trainability of Quantum Fourier Models (QFMs). In this work, we address the question of how this redundancy spectrum is shaped by the choice of eigenvalues of the data re-uploading Hamiltonians, using a simple mathematical formalism based on generating functi...

Weighted Quantum Signal Processing: Low-Depth Polynomial Approximation with Applications to Kolmogorov-Arnold NetworksTier 3

Quantum Signal Processing is a powerful quantum framework for generating and approximating univariate polynomials. However, QSP is often limited by circuit-depth bottlenecks and parity constraints on the class of realizable polynomials. In this work, we introduce Weighted Quantum Signal Processing, an extension of QSP in which a weight function is assigned to the central rot...

A memory-information window in finite-duration quantum controlTier 3

Environmental noise is a major source of decoherence and errors in quantum systems. In a non-Markovian environment, the noise has a finite correlation time, and the system can retain information about its previous interactions with the environment. Here, we investigate how such environmental memory can be observed through a finite-duration coherent quantum operation. Coheren...

From Trainability Diagnostics to Optimization Claims: Boundaries and Controls in Variational Quantum OptimizationTier 3

Barren plateau diagnostics characterize whether gradient signal remains available for training, but surviving signal need not translate into successful optimization. We study this trainability--optimization gap at the level of optimizer steps. Treating coefficient-weighted Hamiltonian-term gradients as task-like components, we introduce step-level diagnostics and derive an e...

Fortaegis Technologies Raises $50 Million Series A to Deploy Hardware-Rooted Quantum-Safe Secure Compute ArchitectureTier 2

Fortaegis Technologies has successfully closed a $50 million Series A funding round led by Serendipity Capital, with participation from major strategic investors. This capital will accelerate the deployment of their hardware-rooted quantum-safe secure compute architecture, which provides advanced security against AI and post-quantum decryption threats by generating dynami...

Optimal control for duty-cycle-limited interferometry with single-NV centersTier 3

Stimulus-responsive hydrogels convert temperature changes into magnetic-field shifts detectable by nitrogen-vacancy (NV) centers, enabling nanoscale thermometry in soft and biological environments. Existing hydrogel-nanodiamond demonstrations rely on NV ensembles, whose high photon throughput is accompanied by gradient-induced inhomogeneous broadening, while idealized single...

Pasqal and LG CNS Sign Three-Year MoU to Integrate Neutral-Atom QPUs into AI Data Center InfrastructureTier 2

Pasqal and LG CNS have signed a three-year agreement to integrate Pasqal's neutral-atom quantum processing units (QPUs) into LG CNS's AI Data Centers in South Korea and the Asia-Pacific region. This partnership aims to deploy hybrid quantum-classical computing platforms for high-performance AI workloads, expanding Pasqal's presence in the APAC market.

QNu Labs Launches QShield 2.0 for Cryptographic Discovery and Quantum ReadinessTier 2

Insider Brief PRESS RELEASE — Most organisations cannot currently produce an accurate account of their own cryptography. QNu Labs, a global leader in quantum security solutions, has launched QShield 2.0 today, the platform powering its National Cryptographic Assessment & Assurance Framework (NCAAF), at its 10th anniversary event in Bengaluru. The launch lands again...

Experimental Measurement and Theoretical Analysis of Energy Relaxation Rates of an Interacting Two-Qubit System on a D-Wave Quantum AnnealerTier 3

In D-Wave quantum annealers, various properties of the ground state have been clarified, whereas the correspondence between theory and experiment for energy relaxation rates in multiqubit excited states remains insufficiently understood. Here, we measured the energy relaxation rates of the first excited states in single-qubit systems and interacting two-qubit systems using a...

Passive Pauli Toggling of Polarization Qubits in Optical Fibers: Error Bounds and QKD PerformanceTier 3

Polarization qubits offer a direct route to fiber-based quantum communication, yet the fiber that carries them also scrambles their reference frame through uncontrolled birefringence. Active compensation commonly relies on monitoring and feedback, raising a natural question: can the link itself suppress coherent polarization drift before it reaches the receiver? We show that...

Shock-Capturing Quantum Algorithm for the Linear Advection OperatorTier 3

The linear advection operator is an ubiquitous building block in fluid and plasma problems. We develop a quantum algorithm for enacting the operator. When the advection velocity is constant in space, our algorithm is exponentially more efficient per time step than classical and avoids spurious oscillations near steep gradients. The algorithm is most cleanly illustrated using...

Hybrid quantum-classical attention for histopathology-based molecular profiling in data-limited cancersTier 3

Molecular profiling from routine histopathology could expand access to precision oncology when sequencing is unavailable, tissue is limited, or training cohorts are small. We developed a hybrid quantum-classical strategy that replaces softmax attention in a transformer for histopathology-based gene expression prediction with a quantum-derived doubly stochastic matrix (QDSM)....

Giant-Atom-Induced High-Order Output Zeros in a Coupled-Cavity ArrayTier 3

Coherent perfect absorption, zero transmission and zero reflection are several scattering phenomena governed by interference engineering in Hermitian and non-Hermitian systems. Higher-order coherent perfect absorption can significantly broaden the absorption bandwidth, while existing implementations rely on scattering zero degeneracy induced by exceptional points or addition...

University of Pennsylvania Demonstrates Single-Gate Parallel Entanglement on Room-Temperature Diamond Quantum RegisterTier 2

University of Pennsylvania researchers have achieved a breakthrough in quantum computing by demonstrating single-gate, parallelized multipartite entanglement on a room-temperature diamond quantum register. They successfully generated a four-qubit Greenberger–Horne–Zeilinger (GHZ) state in just 14.8 microseconds, a tenfold speedup over traditional methods, with significant...

Quantum B Secures European Patent for Quantum Conference Key Agreement ProtocolTier 2

Quantum B has been granted European Patent EP 4462727 for its Quantum Conference Key Agreement (QCKA) protocol. This protocol utilizes multipartite quantum entanglement to establish distributed consensus across independent network nodes, offering an alternative to classical consensus mechanisms. The technology aims to lower communication overhead for multi-party synchroni...

SEALSQ, WISeKey and Jura Sign MoU for Swiss Post-Quantum Semiconductor CenterTier 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, its parent company, WISeKey International Holding Ltd (SIX: WIHN; NASDAQ: WKEY), (“WISeKey” or “the Company”) a global leader in cybers...

Diraq and Dell Test Hybrid Quantum-Classical Computing in SydneyTier 2

Insider Brief PRESS RELEASE — Diraq and Dell Technologies are working together to address one of the central challenges in quantum computing: how to integrate quantum processors with classical high‑performance computing (HPC) in a practical, scalable way. Andrew Dzurak, Diraq’s CEO and Founder, sat down with Dell Global CTO and Chief AI Officer John Roese […]

Universal Eigenvector Statistics of Non-Hermitian Random MatricesTier 3

Eigenvector overlaps quantify nonorthogonality and govern the response and dynamics of non-Hermitian systems. We extend the universality of non-Hermitian random matrices to the statistics of these overlaps. We obtain analytical expressions for eigenvector overlaps in the spectral bulk and near the origin, covering ten symmetry classes in the limit of large matrix size. Using...

Asymmetric quantum cloning on orthogonal orbits and four-mode fermionic statesTier 3

In this work, we study asymmetric (1→2) quantum cloning for pure states belonging to orbits generated by the orthogonal group. For every dimension (d≥3), we determine the full region of achievable pairs of average single-copy fidelities. Using orthogonal covariance and the Brauer algebra, we reduce the optimization over all CPTP maps to a finite-dimensional spectral...

Persistent Quantum-Enhanced Frequency Sensing with T^{-3/2} ScalingTier 3

Quantum sensing uses nonclassical states to improve measurement sensitivity, but the same states that provide metrological gain also decohere more rapidly. This limits the usable interrogation time and, in practice, often precludes improvement in ultimate sensitivity - realized useful quantum advantage has consequently remained rare. Here, we restore persistent quantum advan...

Cavity-QED analysis of InAs quantum-dot single photon productionTier 3

Cavity quantum electrodynamics is used to study the extent cavity enhancement affects single photon performance of an InAs quantum dot, in terms of emission rate, purity and indistinguishability at different temperatures. Parametric studies show a tradeoff between single photon production rate and purity, as well as between indistinguishability and purity. The results indica...

Selection rules for pinned and quasipinned occupation numbers with degeneracyTier 3

When the natural occupation numbers of a fermionic state saturate a generalized Pauli constraint, the state obeys a selection rule: only those configurations of natural orbitals that saturate the constraint themselves contribute. Pinning thus singles out an active space. The selection rule was proved for non-degenerate occupation numbers; for degenerate ones it was conjectur...

Guiding Agents of Quantum Games to Equilibrium using Matrix Exponential Fixed-Point IterationTier 3

In recent years, quantum game theory has gained significant attention as a framework for studying decision-making in multi-agent systems using quantum principles. However, computing equilibrium strategies is challenging because the dimension of the joint Hilbert space grows as the product of the players' local dimensions. In this paper, we consider an extended Gutoski-Watrou...

The Quantum KKL InequalityTier 3

In this paper, we resolve the quantum KKL conjecture of Montanaro and Osborne \cite{MO2010} for quantum Boolean functions on the n-qubit hypercube. More precisely, for every self-adjoint unitary T, we bound the largest L_2-influence from below by a constant multiple of Var(T)log(n)/n. The proof heavily depends on upper and lower commutator estimates on the...

Uhlmann Geometry of Fixed-Rank Density Matrices: A Fiber-Bundle ApproachTier 3

For full-rank density matrices the state space is contractible, the Uhlmann bundle is topologically trivial, and the holonomy admits no quantized invariants; although the Uhlmann phase is genuinely geometric, this topological poverty has kept it from serving as a robust physical diagnostic of mixed-state matter. Mixed states of fixed rank below the Hilbert-space dimension, h...

Sine-Gordon Model with Bosonic Tensor Networks: Continuum Matching and Soliton ScatteringTier 3

We use bosonic tensor networks to connect the lattice sine-Gordon model in the Hamiltonian formulation quantitatively to its continuum theory. Matching the lattice vertex operator to its conformal normalization at the free-boson ultraviolet fixed point yields the exact relation between the bare lattice coupling and the renormalized continuum mass parameter. The soliton mass...

Parameter-Decoupled Quantum Superresolution without Multiparameter EstimationTier 3

Quantum superresolution promises to resolve closely spaced sources beyond the diffraction limit, but existing approaches generally rely on idealized source properties or require simultaneous estimation of multiple coupled parameters of realistic sources. Here we introduce a parameter-decoupled measurement that determines the separation of realistic passive sources without es...

Intrinsic Vectorial Gradiometry via Quantum Control of a Spin-based SensorTier 3

Gradiometry provides a versatile alternative to passive environmental shielding in quasi-static magnetometry, effectively suppressing background noise through differential signal extraction. Nevertheless, traditional implementations rely on multi-sensor architectures restricted to spatial gradients, where subtracting signals from independent detectors involves imperfect supp...

Full macroscopic thermalization and the formation of Schrödinger's cats by unitary time evolution in the weakly perturbed Ising model - Applications of the Roos-Sugimoto-Teufel-Tumulka-Vogel theoryTier 3

We study macroscopic thermalization in the ferromagnetic Ising model with a weak generic (highly nonlocal and many-body) random quantum perturbation. We prove that a single typical perturbation makes every initial state |Φ(0)⟩ in a specified energy shell thermalize: a measurement of a large class of macroscopic observables in the time-evolved state |Φ(t)⟩=e^(-...)

Floquet physics from quantized light-matter interaction: geometric phases, gauge consistency, and entanglementTier 3

Floquet engineering and cavity quantum electrodynamics represent two complementary descriptions of light-matter interaction, yet their precise connection beyond the small-coupling regime remains subtle. Here, by representing the cavity field in a large-photon-number phase basis, we show that the time-dependent Schrödinger equation of a classically driven system emerges direc...

Time rescaling for second-order feedback-based quantum optimizationTier 3

Feedback-based quantum algorithms recently gained attention by demonstrating how quantum computers can be used to solve optimization problems without resorting to hybrid quantum-classical architectures. Recent progress made with Feedback-based Algorithm for Quantum Optimization (FALQON) variants significantly reduced the depth of the required circuits. In this work, we merge...

Spatially resolved quantum magnetometry and stray-field reconstruction of permalloy microdisks using boron-vacancy centers in hexagonal boron nitrideTier 3

Transferable hexagonal boron nitride (hBN) hosting negatively charged boron-vacancy (VB^-) spin defects offers a versatile platform for integrated quantum magnetometry, yet quantitative imaging of magnetic microstructures remains challenging. Here, we integrate a transferred hBN flake with a 4 μm-diameter permalloy (Py = Ni81Fe19) microdisk and perform spatiall...

Semiclassical Arrhenius law for quantum-thermal escape ratesTier 3

The quantum-thermal escape rate from a metastable well in the absence of dissipation is customarily written as a Boltzmann average of the Hill-Wheeler flux over a continuum of energies. However, this continuum treatment diverges exponentially at low temperature. The divergence originates in a mismatch between a quantum partition function and a classical flux integral; retain...

Floquet-spin-orbit compensation and flat- and quadratic-band contact in the α-T_3 latticeTier 3

We investigate Floquet--spin-orbit compensation in the three-band α-T_3 system, which interpolates between graphene at α=0 and the dice lattice at α=1. By tuning the interplay between an off-resonant circularly polarized optical field and intrinsic spin--orbit coupling, we identify three distinct pairwise band-degeneracy conditions in the quasienergy spectrum: (i) va...

Exact DeWitt kernels in Lorentzian quantum cosmologyTier 3

The DeWitt boundary condition can be implemented in the Lorentzian path integral of minisuperspace quantum cosmology by summing only over non-singular paths. We give a general definition of the resulting DeWitt kernels, together with explicit rules for constructing them, and evaluate them exactly. The lapse integral over the positive half-line yields the Dirichlet Green func...

Global Entanglement Quantification via Classical ShadowsTier 3

Detecting and characterizing quantum correlations are tasks of great relevance in quantum information. More specifically, quantifying the amount of multipartite entanglement is a known difficult task, even for pure states. To this end, several entanglement measures have been proposed, although there is currently no universal manner to do so. In this work, we propose the clas...

Quantum states with the same entanglement and local unitary equivalenceTier 3

Local operations assisted by classical communication (LOCC) play a fundamental role in the resource-theoretic formulation of entanglement theory inducing an operationally meaningful ordering in the set of entangled states. The particular class within LOCC of local unitary (LU) transformations is obviously closed under inversion. Thus, LU-equivalent states are interconvertibl...

From sparse quantum-computing data to atomistic simulation with universal machine-learning interatomic potentialsTier 3

We propose a framework for incorporating quantum-computing-based electronic-structure calculations into universal machine-learning interatomic potentials (uMLIPs). Rather than constructing an interatomic potential from scratch, we refine a pretrained DFT-based uMLIP using a small set of accurate reference energies obtained from quantum computing. We demonstrate the approach...

Mechanical Activation of Terahertz Tunneling in Metallic NanogapsTier 3

Metallic nanogaps concentrate terahertz (THz) fields into deep subwavelength volumes and support field-driven electron tunneling when the insulating barrier becomes sufficiently narrow. Here, we demonstrate mechanical control of tunneling-mediated nonlinear THz transmission in a flexible nanogap metasurface. The metasurface consists of Au/PMMA/Au nanogaps fabricated on a pol...

Quantum Loads and the Generalized Telegrapher's ProblemTier 3

We report on the mapping of classical microwave transmission line theory onto the quantum scattering matrix description. By means of a generalized flux formalism a la Devoret, we derive a charge-current vector living on the confining electrodes, to which a Hodge-like decomposition is applied. The presented theory holds equally well for all types of waves traveling within Car...

Polariton Bell Node for Quantum RepeatersTier 3

We propose a Bell-measurement node for quantum repeaters based on a planar semiconductor microcavity operating in the strong-coupling regime. Cavity photons hybridize with quantum-well excitons to form polaritons combining properties of photons and matter quasiparticles. A control photon loaded into one polariton mode changes the polarization response seen by a subsequently...

Entanglement entropy in holographic CFTs with generic boundariesTier 3

Entanglement entropy in holographic conformal field theories with boundaries of generic spacetime signature cannot be described entirely within the standard holographic duality to a real bulk spacetime. We show, both in static and time-dependent setups, that an exact match with the conformal field theory predictions in two boundary dimensions entails an extension of the dual...

Weighted Berry curvature and global geometry of mixed quantum statesTier 3

We examine the geometric interpretation of the quantum geometric tensor proposed in [Phys. Rev. B {\bf 110}, 035404 (2024)] for mixed quantum states, focusing on its imaginary part, which is proportional to a weighted sum of the Berry curvatures of the eigenstates of the density operator. While the real part naturally decomposes into Fisher--Rao and weighted Fubini--Study co...

Commutator Geometry and Information Preservation in the Quantum SwitchTier 3

Two commuting channels yield the same composite channel in either fixed order, yet their quantum switch can alter information preservation. We study how this effect depends on the input state, retaining the joint output of the control and target. Exact Kraus commutator identities determine overlap and squared fidelity gaps. Fixed order preserves product inputs at least as we...

Transcript-Bound Combiners for Downgrade-Resilient Hybrid Post-Quantum Key Establishment: Definition, Proof, and Embedded-Device CostTier 3

Hybrid key establishment runs a post-quantum key-encapsulation mechanism (KEM) alongside a classical Diffie-Hellman primitive, so that the session key stays secure while either component resists attack. This design is now standardized in the Transport Layer Security protocol, Secure Shell, and the Internet Key Exchange, with the standardized module-lattice KEM (ML-KEM) as th...

Pair density Shannon information measures and their N-dependent behaviour in diatomic molecular systemsTier 3

Pair density Shannon entropies and mutual information in position and in momentum space are calculated for two series of homonuclear and heteronuclear diatomic molecules using Hartree-Fock wave functions. The pair density entropy sum increases with the quality of the basis set. Mutual information, a measure of statistical correlation, is seen to be smaller in momentum space...

Unconditional quantum advantage from a two-round CHSH problem in one dimensionTier 3

We introduce a relation problem constructed from the Clauser--Horne--Shimony--Holt (CHSH) game, which we call the two-round one-dimensional CHSH problem. Its two-round structure ensures that the CHSH questions are supplied only after the relevant Pauli-frame data have been fixed, thereby ruling out a simple classical strategy that solves the corresponding problem perfectly w...

Who’s News: Strategic Appointments at Quantum Motion, SQC, Lawrence Semiconductor, and PasqalTier 2

Quantum Motion promoted Dr. Anna Stockklauser to CPO, Silicon Quantum Computing appointed John Hollister as CFO, Lawrence Semiconductor named Don Garrison GM and COO, and Pasqal added Roberto Mauro as CPO and Joëlle Lumb as CHRO. These leadership moves support silicon spin-qubit deployment, global financial strategy, expanded epitaxial foundry capacity, and neutral-atom p...

Previously: 2026-08-18, 2026-07-20, 2026-05-02

GlobalFoundries Finalizes $375M CHIPS Award for Quantum Technology R&DTier 2

Insider Brief PRESS RELEASE — GlobalFoundries (Nasdaq: GFS) (GF) today announced it has finalized a definitive agreement with the U.S. Department of Commerce’s CHIPS Research and Development Office for a $375 million award for research and development to accelerate the company’s Quantum Technology Solutions (QTS) business, designed to help scale domestic quantum semico...

Entanglement-Inducing Quantum Markov ProcessesTier 3

We introduce a new model for a system of interacting bosons placed in an array of sites. At its core is a nonlinear, nonlocal evolution equation, which we have dubbed the Schrödinger-Dirichlet equation. The construction is closely related to the Bose-Hubbard model and to a specific type of generalized bosons. In contrast to conventional mean-field closures, the resulting non...