October 20, 2026

Xanadu Secures Up to $10 Million in Additional DARPA Funding Under QBI ProgramTier 2

Xanadu, a photonic quantum computing company, has secured up to $10 million in additional DARPA funding through the Quantum Benchmarking Initiative (QBI). This one-year contract extension will support Xanadu's hardware and software development, particularly for its fault-tolerant photonic architecture and the PennyLane open-source quantum software framework. The funding a...

Previously: 2026-09-01

Distributing Quantum Circuits Using Pre-Distributed Entanglement Pairs over Quantum NetworksTier 3

Distributing quantum circuits across a network of quantum devices is a recent approach to improve the scalability of quantum computation. Entangled pairs of qubits distributed across network nodes are used as a communication resource for executing inter-node (remote) gates. However, establishing these entanglement pairs incurs significant latency, and doing so during the cir...

Chinese Startup FlipFlop Tuoyuan Emerges with Major VC Backing for 100-Logical-Qubit Neutral-Atom SystemsTier 2

FlipFlop Tuoyuan, a Chinese quantum hardware startup, has secured over $14 million in early-stage funding to develop neutral-atom quantum processing units. Founded in July 2026 by Dr. Qiao Mu, the company aims to build a 100-logical-qubit fault-tolerant quantum computer and utilize AI for experimental design and hardware control.

NVIDIA and Jülich Run 104-Qubit Magic State Cultivation Simulation on JUPITER SupercomputerTier 2

NVIDIA and Jülich Supercomputing Centre simulated a 104-qubit fault-tolerant quantum computing experiment on the JUPITER supercomputer, Europe's first exascale system. This simulation, detailed in an NVIDIA technical report, validated a magic state cultivation protocol that significantly reduces physical qubit overhead. The project utilized JUPITER's 8,192 NVIDIA GH200 Gr...

Previously: 2026-10-19, 2026-10-13, 2026-10-11

Beyond Fidelity: Resolving Errors in Photonic Seed State GenerationTier 3

An important aspect of many linear optical quantum computing architectures is probabilistically generating small dual-rail qubit entangled states, or seed states. While many schemes to achieve this have been discovered, attention has been primarily focused on minimizing input resources and maximizing success probability rather than establishing a detailed understanding of li...

End-to-End Optimization of Partial Fault Tolerance in Neutral-Atom ArraysTier 3

Fault-tolerant (FT) quantum computation offers a pathway to quantum advantage, but its realization is hindered by its significant overhead. The partially FT "STAR" architecture reduces the cost of universal computation at the price of relaxing FT requirements for non-Clifford operations, increasing exposure to hardware noise. Therefore, maximizing its performance and applica...

The Fundamental Memory Ceiling of Noisy Quantum ReservoirsTier 3

Fresh qubits, not size, set how long a noisy quantum system can remember. With k input qubits reinitialized per time step, the longest memory any reservoir can attain under depolarizing noise is exp[Θ(k)] time steps, whatever its size, dynamics, and input encoding. A universal upper bound and an explicit reservoir that attains the exponential scaling establish this opti...

Efficient Block Encodings for Ensembles of Molecular HamiltoniansTier 3

Accurately characterizing molecular properties and reactivity often requires electronic-structure calculations across an ensemble of molecular geometries. Quantum algorithms that process such ensembles coherently could address this challenge, but they require Hamiltonian block encoding circuits that combine advanced factorization techniques with sublinear scaling in ensemble...

Supervised Learning with Quantum Hamiltonian EmbeddingsTier 3

Machine learning is widely regarded as a promising application in which quantum computing could offer a computational advantage. However, general quantum machine learning models with provable guarantees on performance, trainability, and efficient inference remain limited. In this work, we introduce quantum Hamiltonian embeddings, a supervised learning framework in which a cl...

Non-Markovian exceptional points and information backflow: a Heisenberg reaction-coordinate approachTier 3

The primary pathway to the investigation of exceptional points (EPs) in open quantum systems has been the use of Markovian master equations. However, recently it has been realised that they can arise in settings that show non-Markovian behaviour. The main approach in this direction has been the use of pseudomodes, which allow the influence of a structured environment to be r...

Physics-anchored residual quantum neural networks for cloud-cover parameterizationTier 3

Compact quantum neural networks have been explored for cloud-cover parameterization, but their predictive value depends on how physical knowledge is incorporated and which classical models provide the reference. We investigate an offline residual formulation that retains a fitted \XR\ cloud-cover estimate and learns a correction to its logit in transformed target space. Usin...

Universal Quantum Criticality from a Gaussian Variational ManifoldTier 3

Universal behavior at continuous phase transitions is encoded in long-wavelength fixed-point theories controlled by dimensionality and symmetries. It is a central question for which systems this universal behavior and the underlying long-wavelength description can be captured by a noninteracting theory allowing for analytical and accurate predictions. In this work we provide...

Q-MALDetect: Quantum Image-Based Malware Detection and Adversarial Robustness AnalysisTier 3

Quantum machine-learning (QML) models are increasingly considered for security applications, yet their adversarial robustness in malware analysis remains insufficiently understood. This paper presents Q-MALDetect, a hybrid convolutional and variational-quantum detector for byte-image representations of x86-64 Executable and Linkable Format (ELF) binaries, and evaluates it un...

Fast Hubbard-Thouless Pumping with Local Counterdiabatic DrivingTier 3

Counterdiabatic (CD) driving suppresses the excitations of fast protocols by adding an auxiliary Hamiltonian, but in many-body and topological systems the exact CD term is generally non-local and multi-body. We study this obstruction for Thouless pumping in the Rice-Mele model, first without and then with interactions. For noninteracting fermions, the exact CD term of the pu...

Quminex Raises $1.5M CAD ($1.06M USD) Pre-Seed Round Led by Quantacet and QAI Ventures to Advance Mineral Discovery PlatformTier 2

Quminex, a Quebec-based exploration technology startup, has successfully raised $1.5 million CAD (approximately $1.06 million USD) in pre-seed funding. This investment, led by Quantacet and QAI Ventures, will accelerate the commercial development and field deployment of its proprietary Quminex Discovery Platform™. The platform aims to modernize mineral discovery by using...

UK Government and UKRI Unveil £78M ($103.8M USD) Quantum Commercialization, Networking, and Skills PackageTier 2

The UK government and UK Research and Innovation (UKRI) have announced a £78 million (approximately $103.8 million USD) funding package to advance quantum sensing, networking, and workforce development. This initiative, part of the National Quantum Strategy, includes grants for commercial applications, supply-chain development, and an expansion of the QuEST Apprentices Pr...

Measurement-efficient energy estimator for quantum chemistry of photodynamic materialsTier 3

Accurate modelling of chemical reaction rates requires precise correlated energy differences. Quantum computing offers a potential route to their determination, but extracting energies from quantum-prepared states can demand prohibitive sampling. We demonstrate measurement-efficient correlated energy estimation using an electronically challenging H_2DBB--Ru model derived f...

Quantinuum Reports a 10x Reduction in Logical Error Rate on HeliosTier 2

Insider Brief PRESS RELEASE — Quantinuum (NASDAQ: QNT), a leading full-stack quantum computing company, today announced a world-record quantum error-correction result, achieving a logical fidelity of 99.9995% on its Helios commercial computer using the company’s error-correction architecture. This marks Quantinuum’s second breakthrough in two months, demonstrating how...

Coherence Quantum Raises €2.78 Million in Seed RoundTier 2

Insider Brief PRESS RELEASE — Coherence Quantum, a Finnish quantum hardware company originating from Aalto University’s Quantum Computing and Devices (QCD) group, has raised €2.78 million in seed funding to develop a new approach to the cryogenic infrastructure surrounding solid-state quantum processors. The €2.78 million round is led by Helsinki-based early-stage inve...

Higher-order Parity Constraints for Quantum Approximate OptimizationTier 3

The Parity Architecture was originally introduced in the context of quantum optimization algorithms to overcome hardware connectivity constraints. Here, we show that its benefits extend beyond this role by identifying specific parity transformations that enhance the success probability of the Quantum Approximate Optimization Algorithm (QAOA) for optimization problems defined...

Multi-path Security in Quantum Networks with Trusted NodesTier 3

Quantum communication networks promise information-theoretic security but this security collapses if intermediate relay nodes are compromised, a risk that grows sharply when compromised nodes cannot be identified. We address this twofold: first, we show that multi-path routing provides quantifiable protection against unidentified compromised nodes. Second, we provide a compr...

Boundary-Sensitive Quantum Order on Non-Amenable LatticesTier 3

We show that quantum systems on non-amenable lattices, whose boundaries constitute an extensive fraction of the system, host novel forms of bulk ordering with no Euclidean counterpart. Combining boundary-retaining iDMRG with an exact symmetry-fixing duality, we investigate p<5 state clock models on the coordination-3 infinite Cayley tree. We find that between the ordered a...

Quantum algorithms for optimal control: large-scale finite-horizon linear-quadratic regulationTier 3

We develop quantum algorithms for optimal control over a prescribed finite time interval (finite horizon), focusing on continuous-time linear-quadratic regulation (LQR). This foundational control problem often requires solving a nonlinear matrix Riccati equation, which can be costly for large systems and long control durations on conventional classical solvers. We instead wo...

A General Master Equation for Two Accelerated Detectors: Stationary States and EntanglementTier 3

We derive a general Gorini-Kossakowski-Lindblad-Sudarshan master equation for two co-located, uniformly accelerated two-level detectors weakly coupled to scalar fields in the Minkowski vacuum, retaining coherent and dissipative contributions for arbitrary orientations, field masses, and spacetime dimensions. For equal orientations, we determine stationary states and their en...

Phase-sensitive quantum-state texture during thermalization of a Dzyaloshinskii-Moriya Heisenberg dimerTier 3

We investigate quantum-state texture during the thermal relaxation of an anisotropic spin-1/2 Heisenberg dimer subject to a longitudinal magnetic field and a Dzyaloshinskii-Moriya (DM) interaction. Starting from local transverse and longitudinal couplings to a bosonic bath, we construct a global weak-coupling Lindblad equation, identify its transition channels, and discuss...

Quantum Optimal Control PrimerTier 3

This is a set of detailed notes that are part of a Ph.D. Course on Quantum Control delivered at the Department of Chemistry of Seoul National University in 2014. Part of this course was also taught in the Department of Chemistry of the Friedrich Schiller University Jena. It focuses on quantum optimal control and quantum optimal control algorithms based on the gradient and ex...

Ground-State Sampling Correspondence between Penalty-Based and Constrained Quantum AnnealingTier 3

Quantum annealing generally samples degenerate ground states with nonuniform probabilities. This unfair sampling depends on how the driver Hamiltonian couples these states near the end of annealing. For combinatorial optimization problems with a cardinality constraint, the penalty method and constrained quantum annealing (CQA) differ in these couplings. The transverse-field...

Average lower bound on magnetic double-well tunneling with asymptotically large well separationTier 3

We study tunneling between two identical, smooth, compactly supported potential wells in a constant perpendicular magnetic field, with the coupling and magnetic field fixed and the well separation tending to infinity. For a sufficiently small positive magnetic field, we prove lower bounds on the hopping coefficient and on the splitting of the two lowest eigenvalues outside a...

Exact projective-steering boundary and sample-size optimization for angularly averaged hyperon-antihyperon statesTier 3

In hyperon-antihyperon production through electron-positron annihilation, quantum steering provides a stricter test of nonclassical spin correlations than entanglement. We determine when steering survives angular averaging and optimize angular selections to reduce the sample size needed to resolve it. In the specified production-frame spin convention, we show that windows sy...

Exploring ground state phase diagrams of Rydberg atom arrays with finite projected entangled-pair statesTier 3

Rydberg atom arrays (RAA) have been advocated as a promising avenue for the quantum simulation of different exotic quantum states. Numerical predictions for the ground state properties of this experimental platform can, however, be challenging in two-dimensional setups. In particular, faithfully treating long-range interactions is often crucial for distinguishing the fate of...

Majorization for superpositions of nonorthogonal states and the existence of golden statesTier 3

In the resource theory of superposition relative to linearly independent, nonorthogonal reference states, golden states are known for two reference states and for special overlap matrices, and all of them are maximally coherent in the Löwdin basis. We clarify what decides their existence and their Löwdin structure. The robustness and the geometric measure of superposition ar...

Observation and control of polariton noise in a thermal Rydberg atom electrometerTier 3

The establishment of metrics and control of fundamental noise sources in quantum sensing is a long-standing goal in quantum science and technology. We report on the observation of polariton-mediated optical noise in a thermal Rydberg atom vapor and demonstrate its active control and suppression using a radio-frequency field in Rydberg electrometry. The noise exhibits structu...

KrMM Recurrences: HPC-Enhanced Estimators for Nonlinear Classical ShadowsTier 3

While quantum technologies are rapidly evolving, near-term applications heavily rely on hybrid quantum-classical paradigms. Among these, the classical shadows framework has gained a lot of traction, not only for quantum information science, but also for the development and verification of quantum hardware. It allows to efficiently classically estimate many properties of quan...

The Four-Qubit Hyperbolic Quadric Has Contextuality Degree 315Tier 3

The contextuality degree of a set of Pauli contexts is the least number of contexts that every noncontextual ±1 assignment violates. For the four-qubit hyperbolic quadric Q^+(7,2), with $135$ points and $1575$ lines as contexts, Muller et al. conjectured from heuristic searches that the degree is $315$ and that the violated contexts of every optimal assignm...

Giant Rydberg Excitons Delineated as Relativistic Bound StatesTier 3

We examined the energy-momentum relationship of the valence band of Cu_2O, which has gained interest as an emerging solid host for giant Rydberg states. Our findings reveal a nonparabolic dispersion, described using the rest mass (0.570 times the free electron mass) and rescaled light speed (1.6×10^5 m/s), which draws parallels with relativistic theory for high-ene...

Two-qubit cryo-CMOS control of a spin register in diamondTier 3

Utility-scale quantum technologies will not only require a well-performing quantum platform, but also classical control hardware that is scalable, efficient, and meets the design requirements set by the quantum system of interest. One approach is the application of silicon CMOS technology, a highly scalable and mature technology, to design application-specific integrated cir...

High-order resonances and emergent coherent dynamics in interacting Stark chainsTier 3

A linear potential gradient can strongly suppress quantum dynamics, while interactions can activate resonant many-body processes whose higher-order structure remains largely unexplored. Here we uncover a systematic hierarchy of high-order interaction--tilt resonances in an interacting Stark chain, where the resonance order counts the minimal number of elementary exchange ste...

Squeezing-type lower bounds on generalized metrological sensitivityTier 3

We introduce squeezing-type lower bounds for a hierarchy of variance bounds under specific unbiasedness constraints, which generalizes the quantum Cramér-Rao bound. Our construction directly extends standard squeezing coefficients to the corresponding generalized metrological sensitivities while retaining their experimentally accessible structure. We show how observables max...

A Readout-Aware Theory of Approximate Heisenberg PropagationTier 3

Classical methods for computing quantum expectation values often propagate observables in the Heisenberg picture. To remain tractable, these methods rely on approximations that discard operator components during evolution. Yet the magnitude of these components alone does not determine the resulting expectation-value error, which also depends on their subsequent evolution and...

Wave-Particle Complementarity in Quantum Walk from a Quantum Mechanical PerspectiveTier 3

A quantum walk is a mathematical model and a quantum version of a random walk. For the past two decades, it has been studied from mathematical and physical viewpoints. It has many desirable properties. This paper reevaluates quantum walk from a quantum mechanical perspective, as Feynman essentially proposed it as a toy model in his path integral method. Then we demonstrate t...

Quantum control as renormalization group flowTier 3

The Renormalization Group (RG) establishes relations between effective descriptions of physical systems at different scales; in Hamiltonian RG, these relations induce a flow in the space of Hamiltonians. In direct correspondence, we design an RG framework for quantum control by constructing a flow in the space of time-dependent Hamiltonians. A prescribed control subspace, se...

LIDAR with Optically Amplified Thermal LightTier 3

Thermal light exhibits intensity fluctuations or photon bunching that has been used as a source of entropy or temporally correlated light. However, its low spectral density limits its use in practical applications like LIDAR. One method of remedying this is optical amplification to boost its brightness. In this paper, we show that the normalized second order coherence functi...

Time-resolved transient absorption spectroscopy with quantum lightTier 3

We present a fully quantum theory of time-resolved transient absorption spectroscopy, providing a general framework for describing the linear response of a nonequilibrium target to quantum probe fields beyond the semiclassical approximation. We elucidate how quantum correlations between probe-field frequency modes couple to coherences in the target and derive a simple expres...

A Dual-Uplink Dual-Satellite Architecture for Entanglement DistributionTier 3

Satellite-based quantum links are a promising enabler of long-distance entanglement distribution, overcoming the exponential losses of optical fibers. In uplink architectures, entangled photons are generated at ground stations and transmitted to orbiting satellites, reducing space-segment complexity but introducing significant atmospheric and geometric losses. Single-satelli...

Conjugate measurement-induced evolution towards maximally mixed states in quadratic quantum systemsTier 3

In an earlier work, we showed that, in the interaction-dominant setting, coupling the conjugate variables of a subsystem to distinct environment modes drives the subsystem to a maximally mixed state. Here, we extend the study to the full quadratic dynamics of a single-mode subsystem coupled to a two-mode environment, and identify the phase-space mechanism responsible for the...

Entanglement-enhanced Ramsey spectroscopy of broadband signalsTier 3

The use of entanglement in sensing is often motivated by improved sensitivity arising from non-classical correlations among probes. For static signals, however, this quantum advantage in Ramsey spectroscopy with N probes is known to be highly susceptible to dephasing, which severely limits the possible gain from entanglement. In contrast, we consider sensing of signals tha...

How Quantum Is Light? Concepts, Measures, and Applications of Optical QuantumnessTier 3

Quantum states are ultimately responsible for numerous counterintuitive phenomena that defy classical intuition. As the development of quantum technologies accelerates, our ability to harness these quantum resources becomes essential. This review addresses a fundamental question. How do we quantify the quantumness of a state, and which specific traits distinguish it from its...

Podcast with Joel Van Dyk, CTO/CISO and Co-Founder of Done. Quantum Security LimitedTier 2

Podcast with Joel Van Dyk, a physicist turned Wall Street cybersecurity veteran, about the quantum threat to cryptography and what organizations should be doing right now to prepare.

Advance Could Lead to Bigger, More Reliable Quantum Computers, University of Edinburgh Scientists SayTier 2

Insider Brief PRESS RELEASE — Researchers have developed an algorithm that enables off-the-shelf computers to run quantum simulations previously only possible using the world’s most powerful supercomputers. It means the simulations can be run using around five percent of the computing power previously needed to perform them with a supercomputer, the team says. Quantum...

RIKEN Team Improves Parallel Control of Silicon Spin QubitsTier 2

Insider Brief PRESS RELEASE — Silicon spin qubits are a promising platform for building scalable quantum computers as they are compatible with the semiconductor manufacturing technologies used to produce today’s computer chips. However, they have an important weakness: silicon spin qubits typically lose accuracy when several qubits are under parallel control. To...

Enhanced charging in open Rabi and Dicke quantum batteriesTier 3

We investigate open-system charging protocols for Rabi and Dicke quantum batteries under direct incoherent pumping. The charging dynamics follows a Lindblad master equation, while effective non-Hermitian generators describe the conditioned no-jump mechanism. For a single Rabi battery, this pumping suppresses coherent energy backflow, broadens the high-energy charging window,...

PPT-assisted capacities of bosonic Gaussian channelsTier 3

We determine the exact quantum communication and entanglement-distribution capacities of three fundamental bosonic channels, namely thermal loss, thermal amplification and additive Gaussian noise, assisted by operations that completely preserve positive partial transpose (PPT). These operations are more powerful than local operations and classical communication (LOCC), but c...