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ReFINE: Scheduling of Distillation and Coding for Rate-Fidelity Tradeoff in Quantum Networks
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quantum-computing

ReFINE: Scheduling of Distillation and Coding for Rate-Fidelity Tradeoff in Quantum Networks

--> Quantum Physics arXiv:2609.21152 (quant-ph) [Submitted on 17 Sep 2026] Title:ReFINE: Scheduling of Distillation and Coding for Rate-Fidelity Tradeoff in Quantum Networks Authors:Narges Alavisamani, Matthieu Bloch, Moinuddin Qureshi View a PDF of the paper titled ReFINE: Scheduling of Distillation and Coding for Rate-Fidelity Tradeoff in Quantum Networks, by Narges Alavisamani and 2 other authors View PDF HTML (experimental) Abstract:In quantum networks, nodes are connected via sharing of Einstein-Podolsky-Rosen (EPR) pairs, ideally with high fidelity and high rate. However, the fidelity of EPR pairs degrades due to imperfect generation and decoherence errors. Entanglement Distillation is a method that increases the fidelity but operates probabilistically and may destroy all involved EPR pairs upon failure. This failure reduces available EPR pairs for application use, thereby decreasing the service rate. Quantum Error Correction (QEC) is another mechanism to protect EPR pairs against error by forming what we term as Coding-Enhanced Memory (CEM). While effective, CEM requires extra time and resources to form the code, which also reduces the service rate. Existing methods often use static combinations of distillation and CEM, ignoring demand variations. This results in a low service rate without significant fidelity gain. Limited resources together with this rate-fidelity tradeoff make it essential to schedule when to run distillation, form CEM, or serve requests. We propose ReFINE, a demand-aware preemptive scheduler that based on application requirements either serves an available EPR pair immediately or preserves it in CEM. This selective use of CEM, only when needed, enables a better balance for rate-fidelity tradeoff than always using CEM. Between request arrivals, ReFINE either schedules distilling EPR pairs or forming CEM to protect distilled pairs, following one of the three priority policies: ReFINE-D (Distillation-First) first generates EPR pairs for dist

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Unconditional quantum advantage from a two-round CHSH problem in one dimension
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quantum-computing

Unconditional quantum advantage from a two-round CHSH problem in one dimension

--> Quantum Physics arXiv:2609.21237 (quant-ph) [Submitted on 18 Sep 2026] Title:Unconditional quantum advantage from a two-round CHSH problem in one dimension Authors:Yonghae Lee, Jeonghyeon Shin, Soojoon Lee View a PDF of the paper titled Unconditional quantum advantage from a two-round CHSH problem in one dimension, by Yonghae Lee and 2 other authors View PDF HTML (experimental) Abstract:We introduce a relation problem constructed from the Clauser--Horne--Shimony--Holt (CHSH) game, which we call the two-round one-dimensional CHSH problem. Its two-round structure ensures that the CHSH questions are supplied only after the relevant Pauli-frame data have been fixed, thereby ruling out a simple classical strategy that solves the corresponding problem perfectly when all inputs are supplied simultaneously. We construct a quantum circuit on $2N$ qubits that uses only adjacent two-qubit gates, has operational depth at most eight, and achieves the optimal quantum success probability of CHSH, which is strictly smaller than one. We prove that, for every fixed $0\leq\delta<(\sqrt{2}-1)/4$, any randomized classical circuit with fixed wiring and bounded gate fan-in that achieves an average success probability of at least $(2+\sqrt{2})/4-\delta$ requires depth $\Omega(\log N)$ after the questions of the second round are supplied. This yields an unconditional separation even though the quantum circuit is restricted to a one-dimensional geometry, whereas the classical circuit has no geometric locality restriction. The result shows that perfect quantum success is not necessary for unconditional quantum advantage with shallow circuits. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2609.21237 [quant-ph]   (or arXiv:2609.21237v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2609.21237 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Yonghae Lee [view email] [v1] Fri, 18 Sep 2026 02:31:19 UTC

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QNu Labs Maps National Cryptographic Sovereignty Capabilitiesquantum-computing

QNu Labs Maps National Cryptographic Sovereignty Capabilities

Assessing national preparedness for post-quantum cryptography has focused solely on readiness, strategy, inventory, standards adoption and skills. The Readiness, Sovereignty Capability Model (RSCM) now measures both cryptographic readiness alongside genuine cryptographic sovereignty at a national level. Applying this model to fifty-seven actors revealed that twenty countries clear the gate for establishing quantum-safe capacity; weighted agreement between coders reached 0.71. This establishes a new way to evaluate how well nations are prepared for post-quantum cryptography by also quantifying cryptographic sovereignty. The analysis of fifty-seven countries revealed twenty currently possess the means to build their own strong quantum-safe systems domestically. This highlights that being ready to adopt these new technologies differs from actually controlling their development and implementation within national borders. Multimedia University has developed a system to assess national preparedness for post-quantum cryptography, going beyond simply measuring readiness by also quantifying control over them. The team’s Readiness, Sovereignty Capability Model (RSCM) functions like a scoring system used to evaluate how well nations are equipped both to adopt the latest encryption technologies and maintain control over them. Indigenous Cryptographic Capacity, a country’s ability to design, develop, and manufacture its own cryptography tools, is akin to having an in-house engineering department rather than relying solely on outside vendors. Deconstructing national capability in post-quantum encryption technologies The Readiness-Sovereignty Capability Model (RSCM) serves as a scoring system used to evaluate how well nations are equipped both to adopt the latest encryption technologies and maintain control over them.

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Munich Quantum Valley builds ties with Canada at IEEE Quantum Weekquantum-computing

Munich Quantum Valley builds ties with Canada at IEEE Quantum Week

For the first time at IEEE Quantum Week, Munich Quantum Valley partnered with AQT, Invest in Bavaria, MQSC, Peak Quantum, and planqc, indicating a broader representation of the quantum ecosystem at the conference. Held at the Metro Toronto Convention Centre, this year’s event also marked the beginning of a strengthened relationship between Bavaria and Canada; on September 15, MQV gGmbH and Mitacs signed an agreement to support joint research and talent development. The partnership will increase the mobility of students and researchers and encourage collaboration between postsecondary institutions in both regions. Participants at IEEE Quantum Week responded positively to the variety of activities, which sparked discussions. Munich Quantum Valley Showcases Research and Software at IEEE Quantum Week A deepened partnership with Mitacs, Canada’s national innovation connector, was formalized at IEEE Quantum Week through an agreement signed by MQV gGmbH on September 15. The two-year collaboration will fund joint research and workforce development initiatives within the quantum sector, specifically aiming to increase the movement of students and researchers between Bavaria and Canada. The Metro Toronto Convention Centre served as the venue for IEEE Quantum Week, potentially establishing a new regular location for the conference. Munich Quantum Valley’s presence extended beyond presentations; the project maintained a central stand that became a focal point for inquiries regarding the Munich Quantum Software Stack. Attendees demonstrated considerable interest in the software development aspects of quantum computing within the Bavarian ecosystem, seeking information on both research opportunities and career paths, and many visitors inquired about specifics related to developing a software stack for quantum computing applications. This collaborative approach allowed for a wider showcase of Bavarian quantum expertise at the conference. The positive reception of the expanded pres

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India National Quantum Mission

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