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Pentagon Math Over Physics - Small Wars Journal
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Pentagon Math Over Physics - Small Wars Journal

In June 2026, the Department of War released a formal Post-Quantum Cryptography (PQC) Strategy, announced by Department Chief Information Officer Kirsten Davies one day after President Trump signed a pair of executive orders on quantum technology, one of which was devoted to cryptographic security. The strategy sets two deadlines: impact systems must run on post-quantum cryptography or be phased out by December 31, 2030, and every Department of War (DoW) system must run on quantum-resistant algorithms by 2031. Another rule in the strategy places quantum key distribution, the physics-based encryption approach China has pursued since 2016, on the strategy’s list of prohibited technologies.

Sep 17, 2026

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Oracle Launches Java 27 Featuring Hybrid Post-Quantum Cryptography for TLS 1.3

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If the Pace of AI Is Slowed, Investors Can Turn to Quantum Computing. 4 Quantum Stocks to Buy Now. - The Motley Fool

Sep 17, 2026

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BDC Deploys $1 Billion Under Sovereign Defence Platform to Capitalize Quantum and Deep-Tech Ecosystems

Sep 17, 2026

Neutral Atom continues to shine in the modality race

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NSF and UKRI Commit $10 Million in Joint Funding for Molecular Quantum Information Science

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Quantum Encodings, Private Messages, and Communication Complexity

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Advances in the quantum-state texture theoryquantum-computing

Advances in the quantum-state texture theory

--> Quantum Physics arXiv:2609.17704 (quant-ph) [Submitted on 15 Sep 2026] Title:Advances in the quantum-state texture theory Authors:Jose Alfredo de Leon, Miguel Gonzalez, Alejandro Fonseca, Pedro C. Azado, Fernando Parisio View a PDF of the paper titled Advances in the quantum-state texture theory, by Jose Alfredo de Leon and 4 other authors View PDF HTML (experimental) Abstract:The recently introduced concept of quantum-state texture (QST) has found applications ranging from the identification of unknown quantum gates to the study of quantum phase transitions and criticality, and has already been experimentally investigated. Here, we advance its resource-theoretic formulation in several directions. Our approach centers on the experimentally accessible grand sum--the sum of all matrix elements of a density operator in a given basis. We clarify several points raised in the recent literature, including the relation between texture distillation and a simple grand-sum-based QST monotone. We completely characterize free operations for a single qubit and study the resulting state-conversion order; classify relevant families of free operations in arbitrary dimensions; derive bounds relating the texture of composite systems to that of their subsystems; and introduce the basis-independent concept of set texture. Together, these results strengthen and broaden the resource theory of QST, providing a foundation for its further development and applications. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2609.17704 [quant-ph]   (or arXiv:2609.17704v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2609.17704 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Jose Alfredo de Leon [view email] [v1] Tue, 15 Sep 2026 18:16:23 UTC (320 KB) Full-text links: Access Paper: View a PDF of the paper titled Advances in the quantum-state texture theory, by Jose Alfredo de Leon and 4 other authorsView PDFHT

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Diagnosing and Restoring the Degraded Fault Distance of Magic State Cultivationquantum-computing

Diagnosing and Restoring the Degraded Fault Distance of Magic State Cultivation

--> Quantum Physics arXiv:2609.17706 (quant-ph) [Submitted on 15 Sep 2026] Title:Diagnosing and Restoring the Degraded Fault Distance of Magic State Cultivation Authors:Tim Chan, Armands Strikis, Zhu Sun, Zhenyu Cai View a PDF of the paper titled Diagnosing and Restoring the Degraded Fault Distance of Magic State Cultivation, by Tim Chan and 3 other authors View PDF Abstract:T-state cultivation is a resource-efficient protocol producing logical T states but recent benchmarks show that its logical error rate is considerably higher than intended i.e. than S-state cultivation, which is the analogous protocol for producing logical S states. In this paper, we explain this T-S discrepancy by analytically showing, under circuit-level depolarising noise, that distance-3 (-5) T-state cultivation has fault distance 2 (3) due to Pauli hook errors that propagate to coherent Clifford errors after its final double-check circuit; such errors remain Pauli in S-state cultivation, which consequently retains fault distance 3 (5). As part of our analysis we derive a general formula, and an $\mathcal O(n^3)$-time algorithm for fixed logical-qubit count, for the acceptance probability of a logical mixed state afflicted with a Clifford error, where $n$ is the physical qubit count. We then design flags that detect the malignant hook errors in cultivation, improving the pre-escape logical error rate from $\mathcal O(p^3)$ to $\mathcal O(p^5)$. At noise level $p =10^{-3}$, this is a 4.9$\times$ improvement, costing a 1.36$\times$ increase in attempts per accepted shot. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2609.17706 [quant-ph]   (or arXiv:2609.17706v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2609.17706 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Tim Chan [view email] [v1] Tue, 15 Sep 2026 18:18:21 UTC (1,054 KB) Full-text links: Access Paper: View a PDF of the paper titled Diagnosing

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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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Tiny sound waves could help solve a major quantum computing problem

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Digital quantum simulations of scattering in quantum field theories using W states

Digital quantum simulations of scattering in quantum field theories using W states

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IonQ (IONQ) Presented Nine Research Papers At IEEE Quantum Week 2026 - Yahoo Finance

IonQ (IONQ) Presented Nine Research Papers At IEEE Quantum Week 2026 - Yahoo Finance

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Xanadu and AMD Launch Open-Source Backline Extension for PennyLane

Xanadu and AMD Launch Open-Source Backline Extension for PennyLane

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SEALSQ Reports 131% Revenue Growth in H1 2026

SEALSQ Reports 131% Revenue Growth in H1 2026

Sep 11, 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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