Quantum Cryptography & Cybersecurity: Post-Quantum Security & QKD
Post-quantum cryptography news: NIST PQC standards, quantum-safe security, quantum key distribution. Quantum threats & encryption updates.
Quantum computing poses an existential threat to current encryption infrastructure while simultaneously offering unprecedented security through quantum cryptographic protocols. The cybersecurity community faces a dual imperative: migrating to post-quantum cryptographic standards resistant to quantum attacks while deploying quantum key distribution (QKD) for long-term information security.
Post-Quantum Cryptography (PQC) standards from NIST include CRYSTALS-Kyber (lattice-based key encapsulation), CRYSTALS-Dilithium (lattice-based digital signatures), SPHINCS+ (hash-based signatures), and FALCON. These algorithms rely on mathematically hard problems believed resistant to quantum attacks.
India's Quantum Cryptography and Cybersecurity Initiatives
India's National Quantum Mission includes quantum communication as one of four verticals with substantial allocation. The Thematic Hub on Quantum Communication at IIT Madras, established as the IITM C-DOT Samgnya Technologies Foundation, focuses on quantum cryptography, post-quantum security, quantum key distribution networks, quantum memory, quantum repeaters, and satellite-enabled quantum communication.
The Department of Telecommunications (DoT) and Ministry of Electronics and Information Technology (MeitY) coordinate quantum-safe migration for critical infrastructure. The Defence Research and Development Organisation (DRDO) leads quantum-safe security scheme design and testing according to NQM documentation.
Bengaluru-based QNu Labs, selected under NQM startup support in November 2024, develops quantum-safe cryptography and secure communication systems including QKD systems and quantum random number generators for defense, telecom, and data security applications.
The NQM targets developing quantum-resilient encryption and post-quantum cryptographic frameworks for India's critical infrastructure, with satellite-based secure quantum communications over 2000km and inter-city quantum key distribution as specific deliverables.
quantum-computingQIZ Security Raises $17 Million Seed to Lead Cyber Readiness For The Post-Quantum Era
Insider Brief PRESS RELEASE — QIZ Security, the cryptographic posture and Post-Quantum Cryptography (PQC) management platform, today announced a $17 million seed round led by Bessemer Venture Partners and Merlin Ventures, with participation from, Evolution Equity Partners, Qbeat Ventures, Singtel Innov8 and Qino Cyber Capital. The funding will accelerate QIZ‘s rapid growth, deepen product development, and expand the […]
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quantum-computingTiny Vibrations Expand Quantum Memory, ETH Zurich Researchers Find
Researchers at ETH Zurich have, for the first time, combined vibrating memory devices, mechanical resonators, with superconducting qubits, departing from conventional quantum computing approaches. Yiwen Chu and her colleagues are storing information not electromagnetically, but as mechanical vibrations within a quantum chip, significantly increasing the system’s storage capacity; the process resembles the vibrating strings of a guitar producing musical notes. This new architecture intentionally mirrors classical digital computers, separating processing from working memory for greater efficiency. “The interaction between the quantum processor and the quantum memory provides a crucial foundation for establishing quantum computers as a powerful and reliable way to perform computations that are not feasible with conventional computers,” says Yiwen Chu, a professor of Hybrid Quantum Systems. The team demonstrates both fundamental and advanced quantum calculations, providing proof of feasibility and laying the groundwork for a fully programmable quantum computer. Vibrational Memory: Resonators and Quantum Information Storage The ability to densely pack information into a small space remains a critical hurdle in quantum computing, and researchers are now exploring an unexpected avenue: mechanical vibrations. This departure from conventional approaches significantly increases the potential storage capacity within a given volume, offering a pathway toward more scalable quantum processors. The system functions much like a guitar; the resonators, akin to vibrating strings, each produce unique vibrational modes that represent distinct memory slots, with variations within those modes encoding specific information states. Unlike a guitar string governed by classical physics, these quantum vibrations operate under the rules of quantum mechanics, allowing for superposition and entanglement, properties unavailable to traditional computing. The team demonstrates the feasibility of th
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quantum-computingETH Zurich Demonstrates Quantum Computer Architecture With Mechanical Working Memory
Insider Brief A team at ETH Zurich has demonstrated a new quantum computer architecture that uses tiny mechanical vibrations as working memory, offering an alternative to conventional electromagnetic quantum memory while separating computation and storage in a design that more closely resembles a modern digital computer. The work, published in Science, addresses a longstanding challenge […]
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quantum-computingReal-Time VPN Traffic over ETSI GS QKD 014 Key Delivery with a LuxQuanta NOVA QKD Platform
--> Quantum Physics arXiv:2607.06602 (quant-ph) [Submitted on 7 Jul 2026] Title:Real-Time VPN Traffic over ETSI GS QKD 014 Key Delivery with a LuxQuanta NOVA QKD Platform Authors:Felipe Paixão, Anderson Altair Tomkelski, Marcus Elias Silva Freire, Isys Nogueira de Sant'Anna, Adriano Humberto de Oliveira Maia, Reinan da Silva Salazar, Ney Ricardo Lopez Junior, João Marcelo Silva Souza View a PDF of the paper titled Real-Time VPN Traffic over ETSI GS QKD 014 Key Delivery with a LuxQuanta NOVA QKD Platform, by Felipe Paix\~ao and 7 other authors View PDF Abstract:This report presents a prototype VPN that uses QKD-derived keys delivered through the ETSI GS QKD 014 API. The VPN encrypts IP traffic with AES-256-GCM, transports ETSI key identifiers in-band, and retrieves matching keys from local KMEs. After validation with a controlled KME simulator, the system was tested on two Jetson Xavier NX devices connected to a LuxQuanta NOVA QKD platform. The experiment successfully transmitted bidirectional real-time audio and video traffic through the VPN for eight continuous hours, demonstrating the feasibility of integrating classical VPN applications with QKD infrastructure through a standardized key-delivery interface. Subjects: Quantum Physics (quant-ph); Cryptography and Security (cs.CR) Cite as: arXiv:2607.06602 [quant-ph] (or arXiv:2607.06602v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2607.06602 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Felipe Paixão [view email] [v1] Tue, 7 Jul 2026 01:05:41 UTC (5,234 KB) Full-text links: Access Paper: View a PDF of the paper titled Real-Time VPN Traffic over ETSI GS QKD 014 Key Delivery with a LuxQuanta NOVA QKD Platform, by Felipe Paix\~ao and 7 other authorsView PDFTeX Source view license Current browse context: quant-ph < prev | next > new | recent | 2026-07 Change to browse by: cs cs.CR References & Citations INSPIRE HEP NASA ADSGoog
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quantum-computingSemi-Device-Independent Quantum Key Distribution from Operational Assumptions
--> Quantum Physics arXiv:2607.06682 (quant-ph) [Submitted on 7 Jul 2026] Title:Semi-Device-Independent Quantum Key Distribution from Operational Assumptions Authors:Anubhav Chaturvedi, Giuseppe Viola, Ekta Panwar, Tushita Prasad, Debashis Saha View a PDF of the paper titled Semi-Device-Independent Quantum Key Distribution from Operational Assumptions, by Anubhav Chaturvedi and 3 other authors View PDF HTML (experimental) Abstract:Semi-device-independent quantum key distribution leaves the measurement devices uncharacterized while placing a trusted assumption on Alice's source. We formulate this source assumption operationally on Alice's four-preparation ensemble as a scalar bound on one of four physically motivated source tasks: full-label guessing, parity guessing, or their normalized composites with label exclusion. For the two-bit random-access code, we derive the exact classical frontier for each of the four source assumptions. Numerically, the BB84 strategy attains the maximal quantum deviation from all four frontiers, while the preparation-depolarized BB84 family and the direct-sum label-leakage family trace complementary branches of the arbitrary-dimensional quantum boundary for the two exclusion-assisted assumptions. Because all four task values are monotone under input-independent quantum channels, the same scalar source bound constrains every Bob--Eve extension compatible with the complete observed behavior. Using a three-setting extension that separates RAC testing from key generation, we obtain two dimension-independent security certificates over this feasible set: lower bounds on the conditional min-entropy and conditional von Neumann entropy, obtained respectively by direct optimization of Eve's key-guessing probability and by prepare-and-measure semidefinite relaxations based on the Brown--Fawzi--Fawzi variational bound. The exclusion-assisted assumptions certify positive key rates down to nearly vanishing preparation visibility, far beyond full-labe
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quantum-computingSecret Key Rate Analysis of Distribution Matching Algorithms for Discrete-Modulated CV-QKD
--> Quantum Physics arXiv:2607.06783 (quant-ph) [Submitted on 7 Jul 2026] Title:Secret Key Rate Analysis of Distribution Matching Algorithms for Discrete-Modulated CV-QKD Authors:Micael Dias, Caroline Alves, Gabrielly Roman, Søren Forchhammer View a PDF of the paper titled Secret Key Rate Analysis of Distribution Matching Algorithms for Discrete-Modulated CV-QKD, by Micael Dias and 2 other authors View PDF Abstract:Continuous variable quantum key distribution protocols (CV-QKD) with discrete modulation have been intensively investigated to bridge the gap between ideal Gaussian modulation and modern coherent optical communication systems. To mitigate the penalty of discrete modulation, probabilistic constellation shaping (PCS) is applied to the modulation format and is typically performed by distribution matching (DM) algorithms. In this paper, we address the application of DM algorithms to perform PCS in CV-QKD protocols. We investigate the impact of approximating optimized Maxwell-Boltzman distributions with DM algorithms based on Huffman (HDM) and constant composition (CCDM) codes on the protocol's secret key rate (SKR) and tolerance to excess noise. Our results show that specifically symbol-by-symbol HDM degrades the SKR by at least 30\%, whereas CCDM matches the optimal SKR with code length of $10^3$ or more symbols. Furthermore, we also provide a statistical analysis of symbol dependence for both approaches, showing that CCDM must operate with blocks of at least $10^5$ symbols for the correlations become negligible. Finally, we propose an algorithm to generate independent symbols following near-optimal distributions. Comments: Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT) Cite as: arXiv:2607.06783 [quant-ph] (or arXiv:2607.06783v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2607.06783 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Micael Dias [view email] [v1] Tu
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quantum-computingEuropean Consortium QUARTERNEXT Launches to Advance Certifiable Quantum-Key Distribution Systems
European Consortium QUARTERNEXT Launches to Advance Certifiable Quantum-Key Distribution Systems A multinational European deep-tech consortium named QUARTERNEXT has launched a four-year, cross-border initiative to mature and formally certify quantum-safe communication infrastructures. Coordinated by Spanish cybersecurity hardware developer Luxquanta, the project establishes a 48-month deployment pipeline that spans specialized entities across Spain, Austria, and the Netherlands. Funded under the Digital Europe Programme’s IRIS² Quantum Communication Infrastructure (QCI) framework, the partnership develops certified, industrial-grade systems to directly support the European Union’s broader EuroQCI mandate—an initiative focused on interconnecting member states via highly secure, tamper-evident communication networks. [ QUARTERNEXT Consortium Architecture ] Coordinator ──► Luxquanta (Spain) — Managing full CV-QKD structural compliance. Core Technical SMEs ──► Quside (Spain), Chilas (Netherlands), and fragmentiX (Austria). Infrastructure Links──► Telefónica (Telecom Network Carrier) & AIT (Research & Software Lead). Operational Mandate ──► Integration and formal certification of EU-made quantum hardware blocks. The technological roadmap targets the miniaturization, deployment, and standardization of Continuous-Variable Quantum Key Distribution (CV-QKD) systems. While earlier research networks successfully verified primitive quantum key exchanges, translating these frameworks into critical infrastructure requires strict regulatory compliance and the ability to operate over existing classical fiber optics without signal degradation. To minimize installation overhead for commercial telecommunications carriers, QUARTERNEXT is designing advanced coexistence frameworks that partition light frequencies, allowing fragile quantum data channels and heavy classical streams to run concurrently over the same physical optical fibers. The collective engineering execution integ
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quantum-computingSEALSQ and GlobalFoundries Form Alliance to Develop Post-Quantum Semiconductor Blocks and Cryogenic CMOS Infrastructure
SEALSQ and GlobalFoundries Form Alliance to Develop Post-Quantum Semiconductor Blocks and Cryogenic CMOS Infrastructure Post-quantum hardware engineer SEALSQ Corp (Nasdaq: LAES) and foundry group GlobalFoundries (Nasdaq: GFS) have signed a strategic Memorandum of Understanding (MoU) to co-develop secure semiconductor platforms, post-quantum cryptography (PQC) IP, and cryogenic silicon control layers. The development track links GlobalFoundries’ commercial Complementary Metal-Oxide-Semiconductor (CMOS) fabrication processes and bulk manufacturing volume with SEALSQ’s hardware-based certified security cores and PQC-ready root-of-trust modules. The joint initiative focuses on moving quantum computing hardware out of boutique lab setups by manufacturing essential system control units within established, high-volume semiconductor cleanrooms. [ SEALSQ - GlobalFoundries Alliance Matrix ] Manufacturing Hub ──► GlobalFoundries high-volume U.S. and European fabrication facilities. Hardware IP Module ──► Hard macro certified PQC blocks engineered with MIPS architecture. Cryogenic Engine ──► CryoCMOS ASICs for sub-Kelvin quantum processing unit (QPU) control. Sovereign Mandate ──► Secure, traceable supply chain alignment supporting U.S. and European policies. The corporate partnership targets three primary technological segments: Certified PQC Security IP Integration: In collaboration with MIPS (a GlobalFoundries subsidiary), the engineering groups will design pre-certified PQC security IP hard macro blocks and Chiplet Hardware Security Module (CHSM) components. These functional blocks act as hardware-based roots of trust for Secure Enclaves, enabling semiconductor developers to embed hardware-level quantum-resistant protection directly during the initial silicon layout phase rather than implementing it as a post-fabrication software layer. Cryogenic CMOS (CryoCMOS) Architectures: Building on SEALSQ’s quantum ASIC design track and GlobalFoundries’ dedicated Quantum Technology S
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quantum-computingBTQ Technologies Finalizes Full Acquisition of QPerfect to Establish Unified Quantum Infrastructure and Security Ecosystem
BTQ Technologies Finalizes Full Acquisition of QPerfect to Establish Unified Quantum Infrastructure and Security Ecosystem BTQ Technologies Corp. (Nasdaq: BTQ | Cboe CA: BTQ) has officially finalized its full acquisition of French quantum software developer QPerfect SA. Following the receipt of regulatory foreign direct investment (FDI) clearance from the French Ministry for the Economy and Finance, BTQ exercised its definitive option to absorb the remaining outstanding securities of the Strasbourg-based deep-tech startup, rendering QPerfect a wholly owned corporate subsidiary. The transaction integration links BTQ’s existing post-quantum cryptography (PQC) validation structures with QPerfect’s specialized hardware modeling, software emulation, and automation frameworks to deliver a combined, quantum-ready network architecture. [ BTQ - QPerfect Transaction Close Matrix ] Subsidiary Status ──► QPerfect SA finalized as a wholly owned subsidiary of BTQ Technologies Corp. Regulatory Baseline ──► Executed under the June 18, 2026 Prospectus and French FDI sovereign mandates. Core Software Stack ──► MIMIQ™ quantum emulator, Digital Twin modeling, and Quantum Logical Unit (QLU). Integration Mandate ──► Hardening defense, telecom, and critical infrastructure against quantum-enabled risks. The completion of the acquisition allows BTQ to directly monetize and deploy QPerfect’s three proprietary software pillars into industrial networks requiring post-quantum transition verification. The primary layer, MIMIQ™, functions as a high-density software emulator capable of running stable 100+ qubit circuit simulations on conventional classical computing systems to benchmark next-generation Transport Layer Security (TLS) handshakes and stress-test PQC protocol resilience under severe network overhead. This is paired with the Digital Twin framework, which generates software-based structural representations of neutral-atom processors to optimize physical layouts prior to cleanroom fabric
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quantum-computingResourcefulness of non-classical continuous-variable quantum gates
AbstractIn continuous-variable quantum computation, identifying key elements that enable a quantum computational advantage is a long-standing issue. Starting from the standard results on the necessity of Wigner negativity, we develop a comprehensive and versatile approach in which the techniques of $(s)$-ordered quasiprobabilities are exploited to provide rigorous statements on the simulability of photonic quantum circuits consisting of previously characterized gates and thereby identifying the contribution of each quantum gate to the potential achievement of quantum computational advantage. This is achieved by means of an analysis of the so-called transfer function, allowing us to highlight the resourcefulness of a gate set. As such this technique can be straightforwardly applied to current continuous-variables quantum circuits, while also constraining the tolerable amount of losses above which any potential quantum advantage can be ruled out. We use $(s)$-ordered quasiprobability distributions on phase-space to capture the non-classical features in the protocol, and focus our technique entirely on the ordering parameter $s$. This allows us to highlight the resourcefulness and robustness to loss of a universal set of unitary gates comprising three distinct Gaussian gates and any non-Gaussian unitary gate, providing important insight on the role of non-Gaussianity.Featured image: Generic quantum-optical scheme depicted by $M$ input modes, described by a density operator $\rho_{\mathrm{in}}$ processed through a trace-preserving quantum channel $\mathcal{E}$, that can be decomposed into a sequence of trace-preserving quantum channels $\mathcal{E} = \mathcal{E}_1 \circ \mathcal{E}_2 \circ \dots \circ \mathcal{E}_k$. This produces the output state $\rho_{out} = \mathcal{E}(\rho_{in})$ and an output probability distribution $p({x}) = Tr[\rho_{out}\Pi_{{x}}]$ sampled by measuring the POVM $\Pi_{{x}}$.Popular summaryAmong the different platforms being explored for quantum
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quantum-computingQuantum Software Lab: £6.2M Funds Quantum Cybersecurity for UK Energy Networks
£6.2 million has been awarded to the University of Edinburgh’s Quantum Software Lab to address growing cybersecurity vulnerabilities within the UK energy sector as quantum computing capabilities advance. The project, titled Network Security in a Quantum Future, will deliver the open-source Quantum Threat Tracker, a tool designed to estimate when existing energy systems will become susceptible to quantum attacks, shifting from reactive to proactive security measures. Collaboration is central to the effort, with Scottish Power Energy Networks and National Gas working alongside the University to prepare for these emerging risks. “By combining expertise in quantum computing, uncertainty quantification and energy systems, this project will provide evidence-based tools to support a secure and cost-effective transition to a post-quantum future,” says Dr. Petros Wallden, Deputy Director of Research at the Quantum Software Lab. While current computers would take millions of years to crack certain complex codes, quantum computing promises to dramatically reduce that timeframe, creating a significant cybersecurity threat that demands proactive mitigation. This project, formally known as Network Security in a Quantum Future, moves beyond theoretical risk assessment and into the development of practical tools for energy companies. Complementing this is the Quantum-Aware Risk Management tool, intended to support strategic planning for the adoption of quantum-safe technologies across a broad range of energy assets and prioritize future protective measures. The initiative builds upon earlier research identifying potential vulnerabilities and mitigation strategies, now progressing to deliver operational tools for network operators. Professor Chris Dent added, “In addition to the importance to the energy system of maintaining cyber security in the post-quantum world, our work on the consequences of uncertainty in technology projections is an exciting technical challenge, which we are
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quantum-computingBTQ Technologies Gains Quantum Software From 2023 QPerfect Startup
BTQ Technologies has finalized its acquisition of QPerfect, a French quantum computing company founded in 2023, expanding its quantum software capabilities. The July 8, 2026 announcement details the completion of a deal following a prior strategic investment, bringing QPerfect’s MIMIQ quantum emulator, Digital Twin capabilities, and Quantum Logical Unit directly into BTQ’s technology stack. These additions are intended to strengthen BTQ’s mission of “Building Trusted Quantum Technologies” as organizations prepare for the challenges of post-quantum cryptography. BTQ Technologies, traded on both Nasdaq (BTQ) and CBOE CA (BTQ), believes the transition to quantum security will require optimized hardware, software, simulation, and control layers to enable practical deployment at scale. BTQ Acquisition of QPerfect Advances Trusted Quantum Technologies BTQ Technologies’ completion of its acquisition of QPerfect expands the capabilities available for building practical quantum systems, adding crucial software tools for modeling and testing before hardware deployment. The deal, finalized on July 8, 2026, integrates QPerfect’s specialized technologies directly into BTQ’s infrastructure stack, signaling a strategic push toward verifiable and secure quantum networks. Central to this integration is QPerfect’s MIMIQ quantum emulator, a software platform designed to simulate quantum algorithms on conventional computing infrastructure. BTQ reports that MIMIQ has demonstrated the ability to handle simulations of s + qubit, a significant step toward lowering the barrier to large-scale quantum algorithm development and security testing. Beyond emulation, QPerfect’s Digital Twin technology offers a system modeling capability, allowing researchers to simulate and optimize quantum architectures before physical construction, potentially reducing development costs and accelerating timelines. The third key component is QPerfect’s Quantum Logical Unit (QLU), a multi-layered control framework
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quantum-computingSEALSQ and GlobalFoundries Partner on Post-Quantum Security
Insider Brief Press release – SEALSQ Corp (Nasdaq: LAES) (“SEALSQ“) and GlobalFoundries (Nasdaq: GFS) (GF) today announced a strategic Memorandum of Understanding (MoU) to co-develop across secure semiconductor platforms, Post-Quantum Cryptography (PQC) and emerging semiconductor-based quantum computing technologies. The partnership leverages GF’s process technology leadership and manufacturing capabilities alongside SEALSQ’s expertise in hardware-based certified security, PQC-ready silicon solutions […]
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quantum-computingSEALSQ and GlobalFoundries Align on Trusted Supply Chains
Nasdaq: LAES and Nasdaq: GFS announced a publicly traded investment in future security as SEALSQ Corp and GlobalFoundries announced a strategic partnership to co-develop technologies spanning post-quantum cryptography and quantum computing. The collaboration will focus on pre-certified Post-Quantum Cryptography security IP, developed alongside GlobalFoundries company MIPS, with hard macro blocks and Chiplet Hardware Security Modules targeting applications like Hardware Security Modules and Secure Enclaves. Building on GlobalFoundries’ recent investments in quantum technology, the companies will also advance a CryoCMOS ecosystem to support scalable quantum computing systems. “A shared long-term vision between GF and SEALSQ is that semiconductors, cybersecurity, post-quantum cryptography, and quantum computing are converging into a single technology ecosystem,” said Carlos Moreira, CEO of SEALSQ, emphasizing the alignment of their respective expertise and ambitions. GF & SEALSQ Co-Develop Post-Quantum Cryptography Security IP The strategic Memorandum of Understanding, announced recently, will see the two firms co-develop secure semiconductor platforms and solutions designed to withstand the threat of future quantum computers. This partnership addresses the immediate need to secure data against potential attacks, where adversaries collect encrypted information with the intention of decrypting it once quantum computers become powerful enough. A key component of this effort will involve MIPS, a GlobalFoundries company, working alongside SEALSQ to create pre-certified Post-Quantum Cryptography (PQC) security IP blocks. These hard macro components and Chiplet Hardware Security Modules (CHSM) are specifically targeted for integration into applications demanding high security, such as Hardware Security Modules (HSMs) and Secure Enclaves. Pre-certification is crucial, streamlining the adoption process for clients needing to meet stringent security standards. Beyond bolste
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quantum-computingSEALSQ and GlobalFoundries Partner to Accelerate Post-Quantum Cryptography and Quantum Computing Technologies - Yahoo! Finance Canada
SEALSQ and GlobalFoundries Partner to Accelerate Post-Quantum Cryptography and Quantum Computing Technologies Yahoo! Finance Canada
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quantum-computingSix Organizations Unite in QUARTERNEXT to Advance European Quantum Security
A multinational effort to secure Europe’s digital infrastructure has launched, as six organizations, Luxquanta, Quside, Chilas, fragmentiX, Telefónica, and the Austrian Institute of Technology (AIT), have united to form the QUARTERNEXT consortium. The group will develop continuous-variable quantum key distribution (CV-QKD) systems, aiming for certifiable, industrial-grade technology and building on the success of the prior QUARTER initiative. Central to QUARTERNEXT’s mission is direct collaboration with the Nostradamus initiative, providing hardware and software as primary test vehicles for establishing European certification infrastructure for quantum-safe systems; this partnership offers a clear path toward validation and deployment, aligning with the EU’s EuroQCI initiative to interconnect member states via highly secure quantum networks and bolstering Europe’s technological sovereignty in photonics. The emergence of QUARTERNEXT signals a focused, multinational push to translate quantum-safe communication demonstrations to certified, industrial deployment. Recognizing the increasing threat posed by advances in quantum computing, QUARTERNEXT directly addresses the need to safeguard critical infrastructure and aligns with the EU’s EuroQCI initiative for secure quantum networks across member states. The consortium’s strategy centers on the development of CV-QKD systems, with a clear emphasis on achieving formal certification. Building on the three-year success of the QUARTER initiative, which validated QKD integration across finance, healthcare, and cloud infrastructure, QUARTERNEXT aims to establish quantum-safe communications as a permanent part of Europe’s critical infrastructure. A key objective is to strengthen European technological sovereignty by developing EU-made quantum communication components, aligning with initiatives like PIXEurope to reduce reliance on non-European technologies in this vital domain; Sergi Vizcaíno, Dissemination Coordination for QUART
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quantum-computingGuest Post – QSE Expands Post-Quantum Cryptography Solutions for Enterprise Quantum Security Migration
Insider Brief Guest Post by QSE – Quantum Secure Encryption Corp. Equity Insider News Commentary, One of the quieter but more consequential races in technology is the effort to rebuild the world’s encryption before quantum computers grow powerful enough to break it. Governments and standards bodies have set migration deadlines, regulators are turning quantum risk into […]
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quantum-computingEuropean QUARTERNEXT Consortium Advances Quantum-Safe Communication Systems
Insider Brief Press release – QUARTERNEXT, a European-funded consortium dedicated to advancing quantum-safe communication technologies toward certifiable, industrial-grade systems, has officially launched. Bringing together six leading organizations across Spain, Austria, and the Netherlands, the project aims to mature quantum technologies for widespread commercial adoption and secure formal certification under stringent European standards. Coordinated by Luxquanta, […]
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quantum-computingLean-Quantum: Toward AI-Assisted Formalization of Quantum Information
--> Quantum Physics arXiv:2607.05492 (quant-ph) [Submitted on 6 Jul 2026] Title:Lean-Quantum: Toward AI-Assisted Formalization of Quantum Information Authors:Kazumi Kasaura, Kei Tsukamoto, Kento Mori, Risa Mizuno, Takahiro Namatame, Yuta Oriike, Masaya Taniguchi, Sho Sonoda, Hayata Yamasaki View a PDF of the paper titled Lean-Quantum: Toward AI-Assisted Formalization of Quantum Information, by Kazumi Kasaura and 8 other authors View PDF HTML (experimental) Abstract:Quantum information theory is built on entropic quantities; among them, the sandwiched Rényi relative entropy is a fundamental divergence with various applications, and its data processing inequality (DPI) under quantum channels is a cornerstone result. In this work, we present a Lean 4 library for quantum information, designed as a reusable formal infrastructure for theoretical analysis. As a central demonstration of the library, we formalize the DPI for the sandwiched Rényi relative entropy for positive semidefinite operators on finite-dimensional quantum systems. The library provides a basis-independent operator-theoretic framework for finite-dimensional quantum mechanics compatible with the standard mathematical library Mathlib, including reusable interfaces for finite-dimensional systems, states, channels, tensor products, partial traces, Choi operators, Kraus representations, and Stinespring representations. It also builds infrastructure for noncommutative trace inequalities, including operator monotonicity and convexity via the real continuous functional calculus, block-operator positivity, Hilbert-Schmidt operator spaces, Jensen's operator inequality, generalized perspectives, operator power means, and Lieb-Ando trace inequalities. On top of this framework, we formalize entropy-specific ingredients for the DPI: variational formulas for the sandwiched quasi-entropy via Young and reverse-Young inequalities, tensor-product compatibility of real powers, and Haar measures on unitary groups. Together, t
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quantum-computingContractivity of the Hilbert--Schmidt Speed in Unital Quantum Channels: Foundation for Witnessing Non-Markovianity and Discriminating Unital from Non-Unital Markovian Dynamics
--> Quantum Physics arXiv:2607.05619 (quant-ph) [Submitted on 6 Jul 2026] Title:Contractivity of the Hilbert--Schmidt Speed in Unital Quantum Channels: Foundation for Witnessing Non-Markovianity and Discriminating Unital from Non-Unital Markovian Dynamics Authors:Hossein Rangani Jahromi View a PDF of the paper titled Contractivity of the Hilbert--Schmidt Speed in Unital Quantum Channels: Foundation for Witnessing Non-Markovianity and Discriminating Unital from Non-Unital Markovian Dynamics, by Hossein Rangani Jahromi View PDF HTML (experimental) Abstract:We investigate the Hilbert--Schmidt speed (HSS), a geometric indicator defined through the Hilbert--Schmidt norm of the tangent vector to a parametrized family of quantum states, under general open-system dynamics. Working in the framework of finite-dimensional, parameter-independent completely positive trace-preserving (CPTP) evolution where the parameter is encoded solely in the initial state, we prove that the HSS is contractive under every unital CPTP map. Consequently, for any CP-divisible evolution whose intermediate propagators are unital, the HSS is monotonically non-increasing in time. We then establish the generator-level counterpart for Markovian dynamics governed by a Gorini--Kossakowski--Sudarshan--Lindblad (GKSL) master equation with Hermitian Lindblad operators, deriving an explicit non-positive expression for the time derivative of the squared HSS. These results provide a rigorous foundation for using HSS backflow as a sufficient witness of non-Markovianity in physical settings where the relevant CP-divisible Markovian dynamics is known \emph{a priori} to be unital. Conversely, we show by an explicit qutrit counterexample that HSS can increase even in perfectly Markovian but non-unital dynamics, demonstrating that HSS non-monotonicity is not, in general, a faithful indicator of memory effects unless unitality is guaranteed. Our findings clarify the exact scope of HSS-based diagnostics and identify un
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