September 18, 2026

Scalable logical qubitsTier 3

Utility-scale quantum computing will require executing long, complex algorithms with end-to-end error rates far below what physical qubits can support directly. Error-corrected logical qubits are needed to achieve this goal. To make the progress on logical qubits measurable and comparable we introduce the definition of scalable logical qubits: logical qubits preserved for lo...

Proof of a positive coherent-error threshold for topological quantum codesTier 3

Threshold analyses of quantum error-correcting codes are well established for stochastic error models, in which errors occur randomly with given probabilities. However, errors in actual devices can also be coherent, such as unwanted Z rotations due to imperfect control, which are not captured by stochastic error models. For the surface code, numerical studies have indicate...

Noise-Robust Quantum State Characterization for Remote State Preparation with Deep LearningTier 3

Quantum communication underpins secure information processing and scalable quantum networks. In particular, remote state preparation (RSP) enables efficient quantum state transfer, but accurately estimating target states under complex noise remains challenging. Here, we propose a Transformer-based Quantum State Characterizer (TQSC) model for noisy RSP experiments. Our model...

Neutral atom quantum computing for materials science and quantum chemistryTier 3

Neutral atom arrays have emerged as versatile platforms for performing both digital and analogue quantum computing and simulation, with demonstrations ranging from large-scale programmable Hamiltonians realising topological phases or weighted graph optimisation to error-corrected logical qubits with transverse gate operations. This paper provides a broad overview to the neut...

Analytic leakage suppression with a single control field: fast two-qubit gates with tunable couplersTier 3

Simple analytic pulse-shaping techniques are of great practical utility in quantum control, with prime examples being the DRAG method for suppressing leakage in superconducting microwave gates and the transitionless-driving approach to shortcuts-to-adiabaticity. Standard versions of these methods require two orthogonal control channels, with the second channel effectively br...

FT-Weave: Real-Time Compilation Framework for Reconfigurable Fault-Tolerant Quantum ArchitecturesTier 3

Fault-tolerant quantum computing (FTQC) is essential for large-scale quantum computation, but realizing useful application throughput requires coordinating resource preparation, assignment, routing, and logical execution under strict hardware and timing constraints. Many FTQC compilation approaches construct offline schedules using nominal or fixed magic-state factory throug...

Particle Physics Driven by Quantum Technology - Quantum Simulations and Quantum SensingTier 3

We review recent advances in particle physics enabled and motivated by the rapid progress of quantum technologies. The continued development of quantum computing toward large-scale, fault-tolerant systems has the potential to address dynamical problems that remain extremely challenging for classical computational approaches, opening new avenues for studying nonperturbative d...

Quantum WalkScore: Benchmarking Quantum Computers on the Graph Nodefinding ProblemTier 3

Recent advances in quantum computing hardware toward fault-tolerance have increased interest in evaluating near-term quantum platforms on application-relevant quantum algorithms. In this work, we introduce Quantum WalkScore (QWS), a scalable application-oriented benchmark designed to assess the performance of NISQ and future fault-tolerant quantum computers in executing esse...

Previously: 2026-09-17, 2026-09-15, 2026-09-15

Procrastinating einselection in non-Markovian quantum dynamicsTier 3

Among the processes governed by open-system and dissipative quantum dynamics, environment-induced superselection, or einselection, is particularly foundational, since it describes the formation of a preferred set of pointer states through environmental monitoring and ultimately the emergence of classicality. Especially in the context of Quantum Darwinism, einselection can be...

Quantum Simulation of Dissipative Non-Markovian Coupled Classical OscillatorsTier 3

We present a quantum algorithm for simulating classical oscillator networks characterized by non-Markovian dissipation and time-varying material properties, extending recent speedups for undamped harmonic systems to viscoacoustic and viscoelastic media. We embed the history-dependent dynamics into a Markovian state space governed by a non-Hermitian operator by approximating...

TetrisCNN for interpretable detection of phases of matter from experimental quantum simulator dataTier 3

Detecting phases of matter in general relies on identifying the correct order parameter - a task that remains notoriously difficult for unknown transitions and traditionally is guided by physical intuition and educated guess. Neural networks have recently offered an alternative route by locating phase transitions in known models without any a priori physical knowledge. Yet t...

VQE Validation on the Mononuclear T1 (Blue-Copper) Site: A Stepping Stone to the Multi-Copper Laccase ClusterTier 3

Validating variational quantum eigensolver (VQE) pipelines on realistic chemical systems is a critical stepping stone toward tackling classically intractable molecules. In this work, we report emulator-based validation of the VQE workflow proposed for the copper active site, executed on the LRZ Eviden Qaptiva emulator. A problem-tailored ADAPT-VQE with a full singles-doubles...

Parisi Formula for the ground state energy of quantum p-Spin HamiltoniansTier 3

Quantum p-local spin glass Hamiltonians are natural quantum analogues of the classical spin glass models. We provide an asymptotic characterization of the maximal energy achievable by the product states. We prove that for every p ≥2, the limit of ground state energy exists and is given by a Parisi-type variational formula. This settles a question left open by Anschuet...

Exceptional points and Jordan-chain signatures in quantum first-passage statisticsTier 3

Exceptional-point signatures in first-passage observables are governed by two independent survival mechanisms: nonlinear spectral defectivity must pass from the one-record or transfer description to the physical one-level first-passage ladder, and the resulting ladder Jordan mode must have nonzero overlap with the chosen preparation and terminal observation. For finite reset...

Quantum Graph Convolutional Networks: Implementation and Trainability AnalysisTier 3

Graph Neural Networks (GNNs) achieve state-of-the-art performance on graph-structured data, but training and inference on large graphs are often bottlenecked by memory constraints and sparse linear-algebra workloads. Quantum computing offers an alternative set of primitives that may improve scalability for graph learning. Building on the quantum graph neural network (QGNN) f...

Sectigo Launches Quantum Ready for Enterprise PQC ReadinessTier 2

Insider Brief PRESS RELEASE — Sectigo today announced the launch of Sectigo Quantum Ready™, a cryptographic discovery and quantum readiness solution designed to help enterprises discover and map cryptographic assets and dependencies across their entire environment, assess PQC risk exposure and prioritize quantum migration planning. The launch also marks Sectigo‘s...

Coherent and ultra-low-power EDSR with a flopping-mode spin qubit in germaniumTier 3

Hole spin qubits in semiconductor quantum dots (QDs) enable high-fidelity all-electric control, but conventional electric dipole spin resonance (EDSR) can require substantial rf drive power at the low magnetic fields that are favorable for qubit coherence and readout. In planar Ge hole spin qubits, this can reach -27 dBm at the device, posing challenges for scalable architec...

Qtonic Quantum Launches QShield for Post-Quantum Network ProtectionTier 2

Insider Brief PRESS RELEASE — Qtonic Quantum Corp today launched QShield, its SAFE/29 packet runtime, and opened paid, scoped, operator-led engagements to enterprise and government organizations, available now. QShield puts post-quantum encryption on a sensitive network connection using software alone, so an organization can protect what matters most today instead of w...

Locally optimized variational evolution for quantum many-body systemsTier 3

Conventional quantum advantage in many-body dynamics is based on avoiding the simulation cost on a classical computer that arises from the extensive exponential complexity of the global wavefunction. Local observables, however, do not inherit this extensive complexity and may instead be governed by an intrinsic local complexity that is independent of the total system size. T...

Experimental demonstration of finite-size general security via discrete-modulated CVQKD with real time postprocessingTier 3

Continuous-variable quantum key distribution (CVQKD) is compatible with telecommunication infrastructure, but implementing composable security with experimentally practical resources has remained challenging, particularly for discrete-modulated (DM) protocols. We report the first experimental demonstration of a DM CVQKD system that generates composable secret keys against ge...

Highly uniform first-electron position in qubit arrays fabricated on dedicated QSOI(R) 300mm commercial platformTier 3

We report progress toward the development of a quantum silicon-on-insulator (QSOI(R)) technology compatible with 300mm CMOS fabrication and adapted from the 28nm Fully-Depleted SOI (28nm FD-SOI) platform for scalable quantum computing. We compare quantum devices fabricated with standard 28nm FD-SOI and QSOI(R) technologies, and show striking improvements of room temperature...

Lawrence Semiconductor Appoints Don Garrison as General Manager and COOTier 2

Insider Brief PRESS RELEASE — Lawrence Semiconductor, a U.S.-owned manufacturer of engineered silicon and germanium epitaxial materials, today announced that Don Garrison has joined as General Manager and Chief Operating Officer. Garrison reports to Chief Executive Officer Ali Torabi and leads manufacturing, engineering, quality and customer delivery as the company exp...

TQI and Tesseract Quantum Partner for The Quantum KidTier 2

Insider Brief PRESS RELEASE — The Quantum Insider (TQI) is pleased to announce it has entered into a partnership with Tesseract Quantum, a Swiss educational non-profit, whose flagship YouTube science channel The Quantum Kid sports over 120,000 subscribers and nearly 3 million views. Launched in June 2025, the channel featuring 10-year-old Kai interviewing top researche...

IonQ and Synopsys Report Up to 14.6% Faster Engineering SimulationsTier 2

Insider Brief PRESS RELEASE — IonQ (NYSE: IONQ), the world’s leading full-stack quantum platform and foundry, today detailed research conducted with Synopsys. The publication shows early results that quantum algorithms integrated into mainstream engineering software can accelerate complex industrial design by up to 14.6%. The research illustrates hybrid quantum computi...

Environment Alignment and Redundant Record Formation in Imperfect-CNOT Quantum DarwinismTier 3

Quantum Darwinism explains objective information through redundant environmental records. Earlier work established that imperfect records can be amplified and that environment self-evolution can enhance or suppress their formation. We investigate how preparation, interaction angle, and field disorder combine in an imperfect-CNOT model with random Gaussian couplings and pure,...

Parallel quantum channel discrimination and numerical ranges in tensor product subspacesTier 3

Quantum channel discrimination plays a crucial role in quantum information theory. Of particular interest is the case in which the channels can be discriminated perfectly. In this work, we focus on the perfect quantum channel discrimination task in a parallel scheme. We develop an SDP formulation combined with a bisection procedure to compute a quantum state for perfect disc...

Asymptotically Good Quantum Locally Testable CodesTier 3

We construct explicit families of asymptotically good quantum locally testable codes over qubits. More precseily, we construct explicit quantum LDPC CSS codes over qubits having constant rate, constant relative distance and constant weight local testers with constant soundness.

Quantum Entropy Contraction and Factorization from HypercontractivityTier 3

We prove that hypercontractivity implies entropy contraction for a single quantum channel, without a detailed balance condition. For primitive quantum Markov semigroups that are KMS-symmetric with respect to a faithful invariant state σ, we obtain the modified Log-Sobolev bound α_1≥(λ)/((2+log‖σ^(-1)‖_∞)) where λ is the spectral gap. This removes the as...

Mermin-Peres magic rectangles modulo odd primesTier 3

The Mermin-Peres magic square provides a simple example of a system of linear equations over Z/2Z which has no classical solutions but does have a finite-dimensional operator solution. For a long time, it was not known how to construct similar examples over Z/dZ with d odd. In this paper, we construct, for every integer d≥2, a li...

Efficient Non-Uniform Quantum Hermite Transform through Adaptive SamplingTier 3

On the span of the first N oscillator modes, Gauss--Hermite quadrature gives an exact change of basis between mode coefficients and N weighted position space samples. We implement this transform with O(Npolylog(N,1/ε)) logical gates and polylogarithmic quantum width. The operator-error bound ε holds on arbitrary superpositions and i...

Blind Quantum Computation with a Small Quantum ServerTier 3

Blind quantum computation (BQC) allows low-resource clients to securely delegate computations to a quantum server, but server resource costs scale with the computation size, posing a bottleneck for implementations. By leveraging Pauli-based computation (PBC), we achieve BQC with a server whose size depends only on the non-Clifford gate count. Our protocol inherits fault tole...

k-fold unbiased measurements and maximal incompatibilityTier 3

Mutually unbiased bases capture perfect complementarity between two quantum measurements. Extensions beyond pairwise unbiasedness have been proposed, but essentially no non-trivial higher-order constructions are known. We introduce k-fold unbiased measurements (k-UMs), extending the k-fold unbiased bases notion of [arXiv:1706.04446] from rank-one basis measurements to...

Multinegativity and single-letter formulas for asymptotic entanglementTier 3

The study of entanglement inevitably leads to the concept of regularization, where measures are evaluated on infinitely many copies of a state. Single-letter formulas try to make these asymptotic entanglement quantities accessible through a calculation on one copy of a state, but are rarely available. We introduce a decreasing hierarchy of computable upper bounds on the asym...

A counterexample to the quantum Hedetniemi conjectureTier 3

Godsil, Roberson, Šámal and Severini conjectured that the quantum chromatic number of the categorical product of two graphs equals the minimum of the quantum chromatic numbers of the factors. We disprove this conjecture: we construct explicit finite graphs G,H with χ(G×H) ≤1538 < 1539 = min(χ_q(G),χ_q(H)).The graphs are obtained from Zhu's counterexample to...

Schrijver-Delsarte rigidity in association schemes and undecidability of quantum graph homomorphismTier 3

We prove RE-completeness of the quantum homomorphism problem parameterised by families of graphs derived from the classic metric association schemes. These include Kneser graphs, q-Kneser graphs, and the complements of Johnson, Grassmann, and Hamming graphs. Our proof develops a spectral method for establishing non-contextuality of quantum polymorphisms. It combines an equ...

Hardness of Pathfinding in a Welded TreeTier 3

Starting from the entrance of a welded tree, a quantum walk algorithm can find its exit vertex exponentially faster than any classical algorithm. However, it has been an open question whether any quantum algorithm is able to efficiently find a path from the entrance to the exit. We answer this by proving an exponential quantum query lower bound for finding such path. Specifi...

Quantum Noise Limited Nonlinear Phase-Preserving Amplification of a Bosonic ModeTier 3

Does quantum mechanics allow for deterministic amplification schemes that simultaneously behave uniformly for all angles of bosonic phase space (i.e. phase preserving) and are nonlinear in the underlying field operators? Would such a scheme have some utility to quantum information science? In this paper we answer both questions with a resounding yes. Such amplifiers exist, b...

Proof of Shor's conjecture on the accessible information of quantum dichotomiesTier 3

The accessible information of any given quantum ensemble quantifies the maximum amount of Shannon information that can be extracted from the ensemble by any quantum measurement. Almost three decades ago, Shor conjectured that the accessible information of any quantum dichotomy, that is, an ensemble of two states, is attained by a projective measurement. Recently, a proof of...

Lyapunov-controlled thermalization: an exact real-time exampleTier 3

A verified Kubo-Martin-Schwinger (KMS) relation, after a drive has ceased, is not sufficient evidence to prove equilibrium. We demonstrate this in a large-N large-q Sachdev-Ye-Kitaev (SYK) quench protocol. Although all post-quench fermion correlators are exactly thermal, a second quench back to the initial Hamiltonian reveals hidden memory of the initial state. It is enc...

High-order correlations and ultrafast Wigner negativities in bright-squeezed-vacuum-driven high-harmonic generationTier 3

High-harmonic generation (HHG) is a prototypical strong-field process in which intense light drives matter to emit radiation at integer multiples of the driving frequency. Extending HHG into the quantum-optical regime offers new opportunities to probe and control strongly nonlinear light-matter interactions using nonclassical states of light. Yet describing this regime requi...

Technical Report OFDM-Assisted Simultaneous Quantum and Classical THz CommunicationsTier 3

The feasibility of cost-effective simultaneous quantum and classical communication (SQCC) transmitting both the quantum key and classical information via a superimposed coherent state is investigated both in optical and Terahertz (THz) bands. Since the existing THz SQCC schemes assume single-carrier (SC) transmission over flat fading channels, we embark on investigating SQCC...

State-Selective Floquet Memory in Degenerate ManifoldsTier 3

In order to understand which initial states retain memory under periodic driving, it is necessary to depart from the ideal limit giving rise to invariant structures and work inside near-degenerate manifolds. We show that degeneracy itself is not conclusive and what actually matters is how perturbations, such as structural and driving imperfections, acts on the projected mult...

The effects of shot noise on the quantum computation of NMR spectraTier 3

Recent advances in the field of quantum computing hardware motivate the search for applications which demonstrate so-called quantum advantage. One promising use case that has been identified is the simulation of quantum many-body systems. The computational resources required for performing such a simulation on a classical computer generally grow exponentially with the size o...

Entanglement Dynamics in Katz-Weighted Graph StatesTier 3

We investigate the entanglement dynamics of quantum states defined on graphs with non-local Ising interactions governed by the Katz kernel of the underlying network. The interaction pattern is physically motivated by a gapped fermionic mediator propagating on the same graph, whose perturbative elimination yields an effective Katz-weighted Ising Hamiltonian. Using the Entangl...

Dissipative phase transitions in quantum reservoir computingTier 3

Enhanced performance of quantum reservoir computing has been associated with dynamical phase transitions, but whether this connection extends to dissipative systems and which relaxation mechanisms underlie it remain insufficiently understood. We systematically compare driven-dissipative Kerr reservoirs across first-order and continuous dissipative phase transitions and find...

Electrostatic Stabilization of Near-Surface Quantum Sensors via Dielectric Interface EngineeringTier 3

Control of charge-state stability in near-surface quantum defects is critical for nanoscale sensing, yet remains particularly challenging under ultra-high vacuum (UHV), where surface-induced band bending destabilizes the metrologically relevant charge-state. Here, we present a robust and reproducible approach for stabilizing shallowly implanted (< 10 nm deep) nitrogen-vacanc...

Semiclassical scaling of eigenstate thermalization in single-particle chaotic systemsTier 3

We study the off-diagonal matrix elements of real-space observables in time-reversal-invariant single-particle chaotic systems. By analyzing the semiclassical expression for the off-diagonal variance derived from Berry's conjecture, we show that the banded structure of the observable matrix emerges naturally. For local observables, we identify a characteristic bandwidth asso...

Statistical delocalization in the Anyonic Aubry-André modelTier 3

Many-body localization is remarkable in that localization persists despite the presence of dynamical interactions. Here we demonstrate the converse phenomenon: enhanced many-body delocalization induced solely by exchange statistics. We study a Aubry-André quasiperiodic system of anyons in one dimension in the absence of density-density interactions. In terms of anyon operato...

Corner entanglement scaling with projected entangled pair statesTier 3

Entanglement scaling provides a powerful probe of universal properties at quantum critical points. In two dimensions, contributions originating from a corner-shaped bipartition exhibit a universal scaling, which is determined by the underlying conformal field theory. We develop a method to extract this corner entanglement entropy from projected entangled pair states directly...

OQC And Trust Base Study Helps Map The Path to Quantum Advantage in FinanceTier 2

Insider Brief Research by Oxford Quantum Circuits and Trust Base suggests that finding quantum advantage in finance will require more than demonstrating that a quantum algorithm can perform a pricing calculation. The companies examined where quantum methods could fit within financial workflows, how they compared with classical approaches and what would be required to make ...

Guest Post: Why AI Agent Identities Need Post-Quantum CryptographyTier 2

Guest Post by Michael Heinrich, co-founder and CEO of 0G Labs Ask a security team about quantum risk, and the conversation usually starts with encryption: harvest now, decrypt later, with adversaries recording today’s traffic so they can read it once a sufficiently powerful quantum computer exists. That risk is real, and the response is already […]

All causally separable quantum processes are quantum circuits with classical control of causal orderTier 3

The concept of causal (non)separability describes whether the causal order between parties that perform local quantum operations is well-defined or indefinite. Causal (non)separability in the general multipartite setting was introduced and studied in [Oreshkov and Giarmatzi, New J. Phys. 18, 093020 (2016); Wechs, Abbott, and Branciard, New J. Phys. 21, 013027 (2019)]. We res...