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Caltech Team Uses Quantum Simulator to Probe Universal Rules of Quantum Matter

Aug 20, 2026

Fixed-order postselected CHSH reference acquisition for parity-constrained spatial-mode qubits on a commercial cloud photonic processor

Aug 20, 2026

How Quantum Is the Advantage? A Fair, Calibration- and Noise-Aware Benchmark and Attribution Audit of Quantum Machine Learning for Network Intrusion Detection

Aug 20, 2026

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Observable Scaling Hierarchies in Multiphoton Dissipative Quantum Sensing

Aug 20, 2026

Symmetric $N \to M$ telecloning and remote quantum state inference

Aug 20, 2026

Generalizing Pauli Checks for Qudit-based Quantum Error Detection and Mitigation

Aug 20, 2026

Variational Quantum Algorithms for Hyperelasticity: Incorporating Nonlinear Constitutive Behavior

Aug 20, 2026

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Entropic Rigidity in Quantum Memories: How Geometry and Algebra Control the Onset of Degeneracy Correctionsquantum-computing

Entropic Rigidity in Quantum Memories: How Geometry and Algebra Control the Onset of Degeneracy Corrections

--> Quantum Physics arXiv:2608.18420 (quant-ph) [Submitted on 19 Aug 2026] Title:Entropic Rigidity in Quantum Memories: How Geometry and Algebra Control the Onset of Degeneracy Corrections Authors:Yixin Zhao, Fei Yan View a PDF of the paper titled Entropic Rigidity in Quantum Memories: How Geometry and Algebra Control the Onset of Degeneracy Corrections, by Yixin Zhao and 1 other authors View PDF HTML (experimental) Abstract:Maximum-probability (MP) decoding selects the most probable microscopic error, whereas degenerate maximum-likelihood (MLD) decoding includes the configurational entropy of an entire logical sector. Using code-capacity Pauli noise to isolate rigidity intrinsic to the code, we determine the first physical error weight $m$ at which their logical winner sets become disjoint, even under optimal MP tie resolution. Code distance imposes the universal bound $m\geq h=\lceil d/2\rceil$. We define the entropic rigidity depth $r$ through $m=h+r$ and certify a three-level hierarchy: $r=0$ for planar surface codes and two concatenated families, $r=1$ for odd-distance square toric codes and the Gross $[[144,12,12]]$ quantum low-density-parity-check code, and $r=2$ for a separable family with hypergraph product and bivariate bicycle descriptions. The onset fixes the leading operational failure gap, proportional to the $m$th power of the physical noise strength. Geometry and algebra therefore provide quantifiable controls of configurational entropy and an exact benchmark for low-noise decoder selection. Comments: Subjects: Quantum Physics (quant-ph); Statistical Mechanics (cond-mat.stat-mech) Cite as: arXiv:2608.18420 [quant-ph]   (or arXiv:2608.18420v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.18420 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Yixin Zhao [view email] [v1] Wed, 19 Aug 2026 01:17:59 UTC (443 KB) Full-text links: Access Paper: View a PDF of the paper titled Ent

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Asymptotic Entanglement Hiding under Stabilizer Restrictionsquantum-computing

Asymptotic Entanglement Hiding under Stabilizer Restrictions

--> Quantum Physics arXiv:2608.18440 (quant-ph) [Submitted on 19 Aug 2026] Title:Asymptotic Entanglement Hiding under Stabilizer Restrictions Authors:Jicun Li, Wei Xie, Jun Wu, Honglin Chen, Xiang-Yang Li View a PDF of the paper titled Asymptotic Entanglement Hiding under Stabilizer Restrictions, by Jicun Li and 4 other authors View PDF HTML (experimental) Abstract:Entanglement is central to quantum information processing, while stabilizer operations underpin fault-tolerant quantum computation. We ask how much entanglement remains visible or distillable under stabilizer restrictions. We quantify stabilizer-visible entanglement by restricting the measured relative entropy of entanglement to stabilizer measurements, thereby obtaining converse bounds on entanglement distillation under stabilizer operations. We demonstrate magic-free asymptotic entanglement hiding: we construct explicit convex mixtures of pure stabilizer states on $N$ qutrits per party whose unrestricted visible entanglement and LOCC-distillable entanglement both grow as $\Omega(N/\log N)$, while their stabilizer-visible and stabilizer-distillable entanglement vanish as $N\to\infty$. Thus, an unbounded amount of LOCC-distillable entanglement carried by stabilizer states can become asymptotically invisible and undistillable under stabilizer restrictions. We further prove that stabilizer-visible entanglement is $O(1)$ with high probability for Haar-random pure states despite extensive unrestricted visibility, and vanishes uniformly over entangled Werner states as the local dimension grows through odd primes. These results reveal a fundamental separation between entanglement and magic as resources, exposing intrinsic limits on entanglement extraction using stabilizer operations. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.18440 [quant-ph]   (or arXiv:2608.18440v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.18440 Focus to learn more arXiv-issued DOI vi

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Top 10 Quantum Computing Companies in Francetechnology

Top 10 Quantum Computing Companies in France

France’s quantum ecosystem spans neutral atoms, cat qubits, photonics, silicon spin processors, quantum networking and sensing. QuantumNews ranks the ten companies leading this diverse and increasingly commercial technology landscape.

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Sunlight generates entangled photon pairs for the first timeresearch

Sunlight generates entangled photon pairs for the first time

Researchers have achieved this milestone despite sunlight's low coherence and intensity, offering a sustainable alternative to lasers.

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Gujarat to Launch State Quantum Mission, Joining India’s Race to Build Regional Quantum Hubsquantum-computing

Gujarat to Launch State Quantum Mission, Joining India’s Race to Build Regional Quantum Hubs

The Gujarat government plans to establish a dedicated Quantum Mission to accelerate research, skills and practical applications across the state. The initiative will complement India’s ₹6,003.65-crore National Quantum Mission, although Gujarat is yet to announce its budget, governance structure or implementation timeline.

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Top 10 Quantum Computing Companies in Japanquantum-computing

Top 10 Quantum Computing Companies in Japan

Japan is quietly building one of the world's most complete quantum ecosystems — spanning superconducting processors, cold neutral-atom hardware, cryogenic materials, quantum software, and pharma-grade quantum chemistry. According to QuantumNews' Japan country page, the ecosystem now counts 52 companies, 8 university research clusters, and 1 national research institution, concentrated heavily around Tokyo (35 companies), with smaller hubs in Osaka, Wako, Yokohama, Chigasaki, Kyoto, Hamamatsu, and Tsukuba. Here's a deep dive into the Top 10 Japanese quantum computing companies, ranked by their QuantumNews Quantum Score — a composite measure of hardware scale, gate fidelity/error-correction maturity, funding raised & investor quality, and commercial momentum & partnerships.

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India’s 1,000-Km Quantum-Secure Network Marks a Defining Moment for the National Quantum Missiontechnology

India’s 1,000-Km Quantum-Secure Network Marks a Defining Moment for the National Quantum Mission

India’s National Quantum Mission has demonstrated a 1,000-kilometre quantum-secured communication network using indigenous technology developed by QNu Labs. The milestone takes India halfway towards its 2,000-kilometre inter-city QKD target and strengthens the country’s position in quantum communication and cybersecurity.

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Silicon-Spin Quantum Computers Move Closer to Integrated Chipstechnology

Silicon-Spin Quantum Computers Move Closer to Integrated Chips

Researchers have integrated silicon spin qubits, cryogenic CMOS control and superconducting interconnects into a working quantum processing unit. The advance addresses one of the biggest barriers to scaling silicon quantum computers: controlling large numbers of qubits without overwhelming cryogenic systems with wiring.

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Quantum Computing Weekly Round-Up: Week Ending August 15, 2026

Quantum Computing Weekly Round-Up: Week Ending August 15, 2026

Aug 14, 2026
HAWK Lattice Signature Scheme Withdrawn from NIST Round 3 After AI-Assisted Key-Recovery Attack​

HAWK Lattice Signature Scheme Withdrawn from NIST Round 3 After AI-Assisted Key-Recovery Attack​

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Who’s News: Strategic Appointments at PsiQuantum, EigenQ, Qunova Computing, and Optica Quantum

Who’s News: Strategic Appointments at PsiQuantum, EigenQ, Qunova Computing, and Optica Quantum

Aug 15, 2026
Virginia Tech hires quantum algorithms expert Jiaqi Leng

Virginia Tech hires quantum algorithms expert Jiaqi Leng

Aug 13, 2026
Defense lab to formalize QTREX quantum program in Q4 2026

Defense lab to formalize QTREX quantum program in Q4 2026

Aug 13, 2026
DOE’s Brookhaven Lab to lead $7M quantum physics outpost project

DOE’s Brookhaven Lab to lead $7M quantum physics outpost project

Aug 13, 2026
Alice & Bob Joins €4.6 Million QuBriC Network for Quantum Error Correction Doctoral Training

Alice & Bob Joins €4.6 Million QuBriC Network for Quantum Error Correction Doctoral Training

Aug 14, 2026
SEALSQ & Quobly Seal $5 Million Post-Quantum Security Deal

SEALSQ & Quobly Seal $5 Million Post-Quantum Security Deal

Aug 13, 2026
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India National Quantum Mission

Explore India's ₹6,003 Crore quantum initiative: 4 thematic hubs, leading startups, and the latest developments in India's quantum ecosystem

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