Quantum Networking & Communications: Quantum Internet & Entanglement
Quantum internet news: quantum communications, quantum repeaters, entanglement distribution, quantum teleportation. Network architecture updates.
Quantum networking connects distant quantum processors via entanglement distribution, enabling distributed quantum computing, provably secure communications, and quantum sensor arrays.
India's Quantum Networking and Communications Initiatives
India's National Quantum Mission includes quantum communication as a major vertical with specific deliverables: satellite-based secure quantum communications between ground stations over 2000 kilometers; long-distance secure quantum communications with other countries; inter-city quantum key distribution over 2000 km; and multi-node quantum networks with quantum memories.
The IITM C-DOT Samgnya Technologies Foundation at IIT Madras serves as the Thematic Hub on Quantum Communication. Established in partnership with the Centre for Development of Telematics (C-DOT), the hub focuses on quantum cryptography, post-quantum security, QKD networks, quantum memory, quantum repeaters, and satellite-enabled quantum communication.
ISRO plans satellite-based quantum communication missions to demonstrate space-based quantum links. The Society for Applied Microwave Electronics Engineering & Research (SAMEER) in Mumbai develops indigenous QKD systems. The Centre for Development of Telematics (C-DOT) integrates quantum communication with national telecom infrastructure.
The NQM targets operational quantum communication networks connecting major Indian cities, with potential applications in government secure communications, financial transaction security, and defense applications.
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-computingPodcast with Christopher Godfree, Commercial Director at Across the Pond
Why Startup Storytelling is a Good Investment Overview How do you make your quantum startup stand out in an industry where every company name starts with the letter Q? One powerful way to do that is to tell the stories of the people building the technology. Christopher Godfree, Commercial Director at Across the Pond, has worked with Ai executives, robotics experts and Google’s Quantum Team to explain how their work will change the world. In this episode of The Quantum Spin by HKA, Christopher and host Veronica Combs discuss how storytelling can derisk deep tech investments and why it’s important to do more than just explain how something works to attract new employees and investment. 00:00 Welcome to Quantum Spin00:46 Meet Christopher Godfree01:59 Making Complex Human03:55 Finding Quantum Use Cases08:29 Storytelling Grows Business11:30 Engineers as Story Fuel13:21 Google Quantum Launch Playbook16:12 Branding That Stands Out20:15 Storytelling at Tech Speed24:45 Culture and Quantum Narratives26:50 What’s Next and Wrap Up Christopher Godfree is the Commercial Director of Across the Pond, a creative consultancy and studio in one. Based in London, but with teams in San Francisco and Singapore, he works with some of the world’s fastest-growing tech businesses, helping them tell more effective stories about their science and technology. He has worked in communications for twenty years, including at a scale up tech business in Tokyo, ad agency JWT London, and the BBC. Transcript [00:00:00] Veronica: Hello, and welcome to The Quantum Spin by HKA. I’m Veronica Combs. I’m a writer and an editor here at the agency. I get to talk every day with really smart people working on really fascinating subjects, everything in the Quantum industry, from hardware to software. On our podcast, we focus in on quantum communication, and by that I don’t mean making networks safe from hacking or entangling photons over long distance, but talking about the technology. [00:00:26] How do you explai
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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-computingU.S. National Science Foundation Launches Project Triad to Unify Quantum sensing, Networking, and Computing
U.S. National Science Foundation Launches Project Triad to Unify Quantum sensing, Networking, and Computing The U.S. National Science Foundation (NSF) has launched Project Triad, a multi-tiered federal initiative designed to combine quantum sensing, quantum networking, and quantum computing into a single, cohesive operational architecture. In alignment with the executive order “Ushering in the Next Frontier of Quantum Innovation,” the project shifts quantum information science away from isolated laboratory experiments and into real-world application pipelines. The program establishes an integrated informational ecosystem designed to maintain quantum coherence across data acquisition, transit, and processing stages to support defense, manufacturing, healthcare, and economic infrastructure. [ NSF Project Triad Component Grid ] NSF NQVL ──► Proof-of-concept integrated testing beds; design-to-implementation by Dec 2026. NSF X-Labs ──► Milestone-based engineering units optimizing interconnects and photonic links. NSF Quantum+X ──► Direct industry-partnered tracks across biotechnology, energy, and finance. System Objective ──► Unified operational environment integrating sensing, networking, and computation. The physical integration of these three quantum pillars overcomes a primary engineering bottleneck: the loss of quantum information during translation between different devices. By implementing a synchronized system-wide framework, Project Triad enables field-deployable applications that are unachievable through standalone classical or quantum devices. In GPS-denied or highly contested environments, the system pairs high-sensitivity quantum sensors with encrypted quantum network links to maintain secure, localized positioning, navigation, and timing (PNT) data. Concurrently, the architecture supports materials science and natural resource exploration by reducing exploratory drilling footprints through sub-surface density profiling, while advanced biomedical groups util
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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-computingNature: Compact Node Design Yields 93% Raw Bell-State Fidelity
Researchers have achieved 93% raw Bell-state fidelity using a newly designed quantum network node, a crucial step toward building practical and scalable quantum communication systems. The compact design utilizes a parabolic mirror to both trap a single rubidium atom and efficiently collect the emitted photons, aligning them for transmission through fiber optics. This innovative approach circumvents the need for complex cavity setups and demonstrates an inferred overall photon collection efficiency of 9%, despite an initial detection rate of only 5%. According to the team, their results establish a robust, cavity-free neutral atom interface that operates near the limit set by the collection optics numerical aperture, providing a promising building block for future quantum networks and repeaters. Parabolic Mirror Design for Atom-Photon Entanglement A raw Bell-state fidelity of 0.93, achieved with a novel quantum node design, signals a significant step toward practical and scalable quantum networks capable of distributing information with increased security and speed. Central to this advancement is an innovative approach to trapping and photon collection, utilizing a single parabolic mirror to perform both functions simultaneously. This design elegantly sidesteps the complexities of traditional cavity setups, offering a more streamlined and robust architecture for quantum communication. The core of the system relies on millimeter-scale components, pre-aligned and rigidly bonded within a vacuum assembly, and fully interfaced through optical fibers. This meticulous construction minimizes drift and ensures stable operation, critical for maintaining entanglement over extended periods. While initial photon collection and detection efficiency measured only 5%, researchers report an overall collection efficiency of 9% after single-mode fiber coupling, demonstrating substantial optimization within the system. This improvement is crucial because efficient photon collection rema
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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-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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quantum-computingTowards Quantum Network Performance Metrics: Challenges and Demonstration
--> Quantum Physics arXiv:2607.05642 (quant-ph) [Submitted on 6 Jul 2026] Title:Towards Quantum Network Performance Metrics: Challenges and Demonstration Authors:Mohamed Shaban, Mariam Kiran, Muhammad Ismail View a PDF of the paper titled Towards Quantum Network Performance Metrics: Challenges and Demonstration, by Mohamed Shaban and 2 other authors View PDF Abstract:As quantum networks move toward practical deployment, standardized performance monitoring becomes essential. This article proposes a structured monitoring framework for quantum networks with performance metrics, including quality (e.g., entanglement fidelity, QBER, loss, dark count rate), throughput and latency (e.g., entanglement rate, waiting time), timing (e.g., coincidence window, production and coincidence jitter), and exogenous factors (e.g., temperature, humidity, vibrations). These measurements enable real-time observability, benchmarking, and control, supporting use cases such as fault diagnosis, adaptive timing, and entanglement routing. Additionally, we implement a non-invasive prototype environmental monitoring system integrated with the quantum network infrastructure at Oak Ridge National Laboratory, demonstrating practical feasibility of live data collection and alert generation. Furthermore, we discuss the challenges of real-time monitoring and the trade-offs between observability and system performance. This work establishes a foundation for developing advanced quantum network monitoring systems and lays the groundwork for future autonomous control and quantum software-defined networking. Subjects: Quantum Physics (quant-ph); Networking and Internet Architecture (cs.NI) Cite as: arXiv:2607.05642 [quant-ph] (or arXiv:2607.05642v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2607.05642 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Mohamed Shaban [view email] [v1] Mon, 6 Jul 2026 21:10:08 UTC (13,657 KB) Full-t
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quantum-computingUniversity of Science and Technology China Studies Hydrodynamic Breakdown
Researchers in China are challenging a fundamental assumption in the study of quantum dynamics, with findings released on July 2, 2026, suggesting established theories of charge transport may be incomplete. The team, affiliated with the Laboratory of Quantum Information, University of Science and Technology of China, and the Anhui Province Key Laboratory of Quantum Network, states that Kardar-Parisi-Zhang (KPZ) dynamics emerge in an open integrable model, the B3 model, rather than diffusion. According to the research, the B3 model functions as two interacting asymmetric XXZ spin chains, and the prevailing approach only captures the influence of interactions between these chains. The authors state that this work motivates a re-evaluation of the theory of charge transport in open systems beyond the approach based on spontaneous symmetry breaking, potentially reshaping our understanding of non-equilibrium quantum systems and their universal behaviors. Kardar-Parisi-Zhang Dynamics in the B3 Model This research, originating from the Laboratory of Quantum Information, University of Science and Technology of China, in Hefei, Anhui, represents a significant investment in unraveling complex quantum behavior. The license for their work was issued on July 2, 2026. The core of their work questions the widely accepted spontaneous symmetry breaking approach, a framework used to describe charge transport in open quantum systems. The researchers state that, contrary to predictions made by this approach, the B3 model exhibits KPZ dynamics rather than the diffusive dynamics typically expected. “When the initial state is appropriate, the asymmetric XXZ structure dominates the dynamics, which gives KPZ scaling behavior even when the hopping rate becomes negative.” This finding is significant because it suggests that relying solely on spontaneous symmetry breaking is insufficient for a complete understanding of emergent hydrodynamics in open systems. The researchers utilized the Lindbla
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quantum-computingIBM Research Details Quantum Memory’s Role in State Learning
IBM Research scientists report a fundamental trade-off between quantum memory and the efficiency of testing quantum states, demonstrating that retaining nearly all qubits is necessary to maintain established advantages over learning those states. The team’s work reveals that when limited to only k qubits of coherent quantum memory, the testing-vs-learning separation is lost. Specifically, they’ve established the sample complexity required to test these states is Θ(n-k). Even with k = 0.99n qubits of memory, there is no constant-copy stabilizer tester; for k = cn qubits of memory (where 0 < c < 1), stabilizer testing is as hard as learning, both demanding Θ(n) copies. Stabilizer State Testing with Limited Memory Retaining nearly all qubits is crucial to maintain the established relationship between testing and learning in quantum systems, according to new research from IBM Research and Freie Universität Berlin. The study, published this week, investigates how restricting coherent quantum memory impacts the efficiency of verifying quantum states, specifically stabilizer states. Previously, researchers knew that testing these states required only six copies without memory constraints, a significant improvement over the learning complexity of Θ(n). They demonstrate that the sample complexity of testing stabilizer states in this framework is Θ(n−k). The researchers report that with k = 0.99n qubits of memory, there is no constant-copy stabilizer tester; for k = cn qubits of memory (where 0 < c < 1), stabilizer testing is as hard as learning, both demanding Θ(n) copies. This is a high memory threshold, suggesting that maintaining a substantial portion of the qubits in a coherent state is essential to preserve the separation between testing and learning. The authors highlight the diminishing returns of adding memory beyond this point. The findings underscore that quantum memory isn’t merely an implementation detail, but a computational resource that dramaticall
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quantum-computingNSF Launches Project Triad to Advance Quantum Technology For Real-World Applications
Insider Brief PRESS RELEASE — The U.S. National Science Foundation today announced Project Triad, a first-of-its-kind initiative to integrate quantum sensing, quantum networking and quantum computing into a single operational system. By bringing these three capabilities together for the first time, Project Triad will move quantum technology out of the lab and into real-world use […]
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quantum-computingThe Centre for Quantum and Society: How CQS Advocates Evidence-Based Quantum Tech Communication
The Centre for Quantum and Society is challenging conventional approaches to science communication, arguing that simply providing more information isn’t enough to build public trust in rapidly developing quantum technologies. Led by Dr.ir Julia Cramer, head of the Quantum and Society group, a collaborative paper, “From Quantum Enthusiasm to Quantum Engagement,” questions why quantum communication is happening, not just what is being communicated. The authors advocate for a move away from the traditional “deficit model,” which assumes skepticism stems from a lack of knowledge, towards an evidence-based and participatory approach. “If we believe quantum technologies have the potential to transform encryption, influence geopolitics and revolutionize medicine, then we also have a responsibility to engage society while the technology is still shapeable,” they write, framing this as a step towards priming societal readiness and giving it the same rigor as technological readiness. Evolving Communication Beyond Awareness for Quantum Science & Technology Quantum science and technology communication is undergoing a critical reassessment, shifting focus from simply generating excitement to fostering genuine public engagement and trust. This evolution is outlined in a new vision paper published by the Centre for Quantum and Society (CQS) in collaboration with QDNL and Leiden University. The authors challenge the traditional methods of science communication, which incorrectly assumes public skepticism is solely due to a lack of information, advocating instead for evidence-based and participatory methods. Research indicates that increased scientific literacy alone does not guarantee public trust or support; instead, communication must enable authentic dialogue. Mayra van Houts, Head of Strategy at QDNL, emphasized the need for evolving language as quantum technologies integrate into everyday solutions, stating, “As quantum technologies become part of real-world solutions, the
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quantum-computingCSIRO Builds Quantum Light Sources to Detect GNSS Signal Tampering
CSIRO researchers have developed two field-ready Quantum Light Sources as part of a Defence Science and Technology Group project designed to secure timing signals in environments where GPS and other Global Navigation Satellite Systems (GNSS) are disrupted. These quantum-enabled devices generate entangled photons for ground-to-satellite time transfer, creating a signal highly sensitive to interference and allowing detection of both jamming, blocking signals, and more sophisticated spoofing attacks that transmit false information. “This work is a significant milestone in the development of quantum-secure time transfer in Australia,” stated CSIRO Technical Lead, Matt Broome. Precise timing from GNSS underpins not only defence operations, but also critical civilian infrastructure including power grids, finance, transport, and emergency services, making signal resilience a growing global concern. Entangled Photons Enable Secure Ground-to-Satellite Timing These are not theoretical prototypes, but practical devices designed to maintain secure timing even when conventional Global Navigation Satellite Systems (GNSS) signals are compromised, a vulnerability increasingly exploited through jamming and spoofing. The CSIRO’s approach centers on generating entangled photons for ground-to-satellite time transfer, a method that introduces a unique layer of security. Unlike traditional signals, this quantum-enabled timing signal is highly sensitive to interference, allowing for the immediate detection of any tampering attempts; users can then seamlessly switch to an alternate channel, mitigating the impact of attacks. The team initially collaborated with Heriot-Watt University to transition a laboratory design into a field-deployable system capable of maintaining quantum correlations over vast distances, according to CSIRO. This entanglement distribution relies on a fundamental principle of quantum physics: two photons become linked such that any change to one is instantly reflected
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quantum-computingMichigan State University Team Builds Nickel-Vacancy Qubit for Millisecond Quantum Memory
A new diamond-based platform offers key advantages for building scalable quantum networks. I. M. Morris at Michigan State University, and colleagues, in collaboration with University of Leipzig, Element Six Global Innovation Centre; Didcot, Coatings and Diamond Technologies, and Felix Bloch Institute, demonstrate that transition-metal defects in diamond enable efficient optical access, coherent control, and long-lived quantum memory. Their findings show nickel-vacancy (NiV^-) defects provide spin-orbit protected coherence, all-optical control, and near-infrared emission, resulting in a coherence time exceeding one millisecond at 1.65 K and establishing NiV^- as a promising candidate for a deployable diamond spin-photon interface. Millisecond coherence achieved in nickel-vacancy centres via all-optical dynamical decoupling Scientists at Michigan State University and collaborating institutions have extended the coherence of a nickel-vacancy (NiV−) defect in diamond to 1.27 milliseconds from 371 nanoseconds, utilising all-optical dynamical decoupling. This breakthrough is a key threshold for building deployable diamond spin-photon interfaces, previously hindered by short coherence times. Operating at 1.65 K, this all-optically controlled diamond spin qubit requires a temperature readily achievable with standard cryogenics, avoiding complex cooling systems. Raman Rabi oscillations and Ramsey interferometry confirmed the NiV− defect’s potential as a stable platform for quantum information storage and processing, opening a new design space for diamond-based quantum technologies beyond the limitations of existing defects. Utilising all-optical dynamical decoupling, a coherence time of 1.27 milliseconds was achieved in a nickel-vacancy (NiV−) defect within diamond by researchers at Michigan State University and their colleagues. These experiments involved manipulating the spin of the nickel-vacancy using precisely timed laser pulses, verifying the NiV− defect’s capability t
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