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-computingTelia and QMill Demonstrate a New Quantum-Enhanced Data Encryption Method for Mobile Networks
Telia Finland and QMill have successfully demonstrated quantum-enhanced encryption for mobile networks, offering protection against both classical and quantum computing attacks. The new method leverages local or cloud quantum computers to secure critical communications. This builds on Telia’s prior quantum key distribution achievements and has been presented to the Finnish Defense Forces. Future plans include expanding the technology across various use cases. The post Telia and QMill Demonstrate a New Quantum-Enhanced Data Encryption Method for Mobile Networks appeared first on The Qubit Report.
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quantum-computingTelia and QMill Demonstrate New Quantum-Enhanced Data Encryption Method For Mobile Networks
Insider Brief Telia Finland and QMill demonstrated a quantum-enhanced encryption method for mobile networks designed to protect communications against both classical and future quantum computing attacks. The encryption approach, enabled by local or cloud-based quantum computers, was tested on critical network infrastructure and presented to the Finnish Defence Forces as part of ongoing evaluations of quantum security technologies. The project builds on Telia’s earlier quantum key distribution testing through Finland’s NaQCI.fi initiative and is expected to expand into broader communications security applications through continued collaboration between the two companies. PRESS RELEASE — Telia Finland and QMill have developed quantum-enhanced message encryption for mobile networks. QMill’s new encryption method is enabled by local or cloud quantum computers. Once completed, the method is designed to protect messages against attacks carried out using either classical or quantum resources. ”The security of our networks is becoming more crucial, especially for our mission-critical customers. In this first demonstration with QMill we focused on the most critical part of our network, but this method could be applied more widely and, in the long-term, it could potentially establish a new standard for encrypted communications,” says Jari Collin, Head of Customer Segment Defence, Telia Finland. “It is important that we were able to include Telia as a telecom operator in this phase. We will continue developing our quantum-enhanced security method with the objective of making it available as a standalone product, while also using it to complement other encryption methods by adding an additional layer of security,” says Hannu Kauppinen, CEO of QMill, which is a pioneering quantum algorithm and software company based in Finland. The method has also been demonstrated to the Finnish Defense Forces. According to the C5 Division of the Defense Command
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quantum-computingDetectability Limits for Intra-Block Temporal Drift in Finite-Key Entanglement-Based QKD
--> Quantum Physics arXiv:2605.24230 (quant-ph) [Submitted on 22 May 2026] Title:Detectability Limits for Intra-Block Temporal Drift in Finite-Key Entanglement-Based QKD Authors:Rafael Duarte Marcelino, Julio Smanioto Garcia, Matheus Rufino View a PDF of the paper titled Detectability Limits for Intra-Block Temporal Drift in Finite-Key Entanglement-Based QKD, by Rafael Duarte Marcelino and 2 other authors View PDF HTML (experimental) Abstract:We study the statistical detectability of intra-block temporal drift in finite-key entanglement-based quantum key distribution, with particular relevance to E91-type parameter estimation and monitoring. Drift is modeled as a mean-preserving Lipschitz perturbation of Bernoulli observables, capturing structured temporal variation that is invisible to global-average tests. For a block of size $n$ and confidence levels $(\alpha,\beta)$, we formulate a minimax hypothesis-testing problem and define the minimal detectable amplitude. We derive matching lower and upper bounds yielding $\delta_{\min}(n,\alpha,\beta)=\Theta(n^{-1/2})$: if $n\delta^2 \to 0$, no level-$\alpha$ procedure can guarantee nontrivial uniform power over the admissible drift class, whereas a calibrated CUSUM statistic detects drift at the matching scale. Explicit constants for linear, sinusoidal, and step profiles, together with simulations, confirm the predicted scaling collapse. The result quantifies a finite-block monitoring-resolution limit and is distinct from composable security certification. Comments: Subjects: Quantum Physics (quant-ph) MSC classes: 81P94, 62G10, 62L10 ACM classes: E.3; G.3 Cite as: arXiv:2605.24230 [quant-ph] (or arXiv:2605.24230v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.24230 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Rafael Duarte Marcelino [view email] [v1] Fri, 22 May 2026 21:18:46 UTC (516 KB) Full-text links: Access Paper: View a PDF o
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quantum-computingPodcast with Klea Dhimitri of Hamamtsu Photonics
Klea Dhmitri of Hamamatsu joins Yuval to discuss the company’s role as a photonic component provider for trapped-ion and neutral-atom quantum computers. She explains key technologies such as photomultiplier tubes (PMTs), SPADs, and quantitative CMOS cameras, and how scaling to larger qubit arrays changes requirements for speed, resolution, and integration. Klea also shares how customer demand is pushing product innovation, reflects on her unconventional path into quantum, and offers advice for those looking to build careers in photonics and quantum technologies. Transcript Yuval: Hello, Klea. Thank you for joining me today. Klea: Hi, Yuval. I’m glad to be here. Yuval: So who are you and what do you do? Klea: Hi, yes, happy to introduce myself. So I’m Klea Dhmitri and I work for Hamamatsu Corporation, which is the North American subsidiary of Hamamatsu Photonics. And I will be with Hamamatsu eight years in June. And what I do here is I lead our quantum computing and quantum communication project here in North America. And so what that means is I engage a lot with the community in helping, you know, folks from academia to industry find solutions of the product, help them find photonic solutions of the current products that they’re building, but also keeping in mind their next generation. And this is really where I work closely with our R&D colleagues in Japan and bringing these maybe R&D or prototype solutions and detection, modulation, and even lasers to these customers. And I also do a lot of marketing as well. So you’ll find me at trade shows, doing webinars, and really creating content that explains where Hamamatsu plays in this space. And so maybe a bit of a sort of a fun tidbit is actually this role in this project did not exist when I joined the company. So it was a bit serendipitous. So I’m happy to jump into that later in the conversation if you’d like to learn more. Yuval: What kind of components does Hamamatsu provide to qua
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quantum-computingQuantum Security Venture Pramatra Space Raises Pre-Seed Funding
Insider Brief Bengaluru-based Pramatra Space raised an undisclosed pre-seed round led by Seafund Ventures to advance its quantum-secure satellite and terrestrial communications technology ahead of the emerging “Q-Day” cybersecurity threat. The company is developing quantum key distribution systems and has validated its proprietary photonics integrated circuit chip for entanglement-based quantum communications at IIT Madras, with an in-orbit demonstration mission planned for 2027. Investors said the funding reflects growing interest in sovereign deep-tech capabilities spanning quantum technologies, cybersecurity and space infrastructure in India. PRESS RELEASE — Pramatra Space, a Bengaluru-based quantum security venture, has raised an undisclosed pre-seed funding round led by Seafund Ventures. The round also saw participation from Rebalance, Magnivia Ventures with their partner Peaceful Progress Fund, and from notable angel investors such as Awais Ahmed, Founder of Pixxel Space. Early investors include Techstars (US), Neel Mehta (Founder of Roh Ventures), Raghunath Das (Co-Founder & CEO of Almagest Space), and Bhavya Doshi (Director at KRISS Portfolio), with other angel investors. Founded in 2023 by Richa Hukumchand and Vinay Hukumchand, Bengaluru-based Pramatra Space is on a mission to make enterprises quantum-resilient before Q-Day. Pramatra Space is building hybrid satellite & terrestrial systems for global quantum-secure communications. Its technologies use Quantum Key Distribution (QKD) to securely generate and distribute encryption keys for data centres and space infrastructure, acting as an additional security layer to prepare enterprises against evolving cyber threats. They have achieved a key technical milestone of validation and testing their proprietary photonics integrated circuit (PIC) chip for quantum entanglement-based QKD at IIT Madras. The company has booked an in-orbit demonstration mission for its payload in partnership wi
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quantum-computingTwo Operational Principles Single Out Quantum Theory
--> Quantum Physics arXiv:2605.23217 (quant-ph) [Submitted on 22 May 2026] Title:Two Operational Principles Single Out Quantum Theory Authors:Kenji Nakahira View a PDF of the paper titled Two Operational Principles Single Out Quantum Theory, by Kenji Nakahira View PDF Abstract:Quantum theory combines density matrices, Born probabilities, tensor-product composites, positive-operator-valued measures (POVMs), and quantum channels. In a finite-dimensional causal operational theory, we prove that two postulates suffice: local input-output statistics identify channels, and every state admits an equivalent-system purification, unique up to reversible dynamics. The full complex quantum formalism follows; every consistent probability rule is realized as a POVM, so measurement no-restriction is derived rather than assumed. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2605.23217 [quant-ph] (or arXiv:2605.23217v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.23217 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Kenji Nakahira [view email] [v1] Fri, 22 May 2026 04:19:55 UTC (1,124 KB) Full-text links: Access Paper: View a PDF of the paper titled Two Operational Principles Single Out Quantum Theory, by Kenji NakahiraView PDFTeX Source view license Current browse context: quant-ph < prev | next > new | recent | 2026-05 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article
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quantum-computingCanada Opens $5.5 Million Quantum Networking Challenge to Advance Quantum Repeaters
Insider Brief The Canadian government launched two Innovative Solutions Canada challenges offering up to $5.55 million in potential funding for Arctic optical ground stations and long-distance quantum repeater technologies aimed at strengthening next-generation communications infrastructure. The Department of National Defence is seeking a ruggedized, transportable optical ground station capable of high-bandwidth laser communications with low Earth orbit satellites in Arctic conditions, with Phase 2 prototype funding worth up to $2 million. Innovation, Science and Economic Development Canada is funding quantum repeater technologies designed to extend quantum network distances through quantum memory and entanglement-swapping capabilities, with one Phase 2 grant valued at up to $3 million. Photo by WikiImages on Pixabay Canada has launched a new quantum networking challenge aimed at pushing domestic researchers and companies toward building quantum repeaters capable of extending quantum communications across long distances — one of the field’s most difficult technical goals. According to the announcement from Innovation, Science and Economic Development Canada (ISED), the federal government is seeking proposals for technologies that could eventually allow quantum information to travel farther than is possible through direct transmission alone, a major barrier facing the development of future quantum networks. The challenge, which opened May 21 and closes July 2, offers support through Canada’s Innovative Solutions Canada program and is structured around two streams, including early-stage feasibility studies and more advanced prototype development. The effort reflects growing international competition to develop quantum networking infrastructure, an area viewed as strategically important for cybersecurity, communications and distributed computing. Quantum repeaters are considered a critical missing piece in large-scale quantum networks. In conventional optical communica
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quantum-computingOnline Short Course on “Free-Space Quantum Communication”
Online Short Course on “Free-Space Quantum Communication” Dates: Monday, July 27, 2026 to Friday, July 31, 2026Web page: https://www.prl.res.in/prl-eng/uncssteapRegistration deadline: Saturday, May 23, 2026Submission deadline: Saturday, May 23, 2026Applications are invited for a short course on “Free-Space Quantum Communication” (July 27-31, 2026) to be conducted Online by Physical Research Laboratory (PRL), Ahmedabad under the auspices of the Center for Space Science and Technology Education in Asia and the Pacific (CSSTEAP), affiliated to the United Nations. Application deadline June 30, 2026 Log in or register to post comments
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quantum-computingEPB and University of Tennessee at Chattanooga Launch $6.8 Million Quantum Workforce Initiative
EPB and University of Tennessee at Chattanooga Launch $6.8 Million Quantum Workforce Initiative The Board of Directors for EPB has approved a formal resolution establishing a $6.8 million USD joint funding partnership with the University of Tennessee at Chattanooga (UTC). The matching investment allocates $850,000 annually from each institution over a four-year operational term. The programmatic mandate expands regional academic infrastructure, funds applied research tracks, and builds commercialization pathways for emerging quantum hardware and software protocols. The initiative leverages Chattanooga’s existing municipal infrastructure, centering its operational workflows around the EPB Quantum Center. Technical Architecture & Specifications / Operational Implementation The technical framework builds directly upon the regional fiber-optic distribution grid, expanding academic access to the EPB Quantum Network. Launched commercially in 2023, the software-managed network provides programmable channels for quantum key distribution (QKD) and quantum networking experimentation, with UTC operating an active, on-campus network node. The newly expanded funding expands this physical testbed to integrate upcoming EPB Quantum Computing cloud-service resources slated for rollout later in 2026. The capital injection funds active research programs across four core technical disciplines: quantum algorithm design, quantum machine learning (QML) data models, multi-node quantum networking protocols, and nitrogen-vacancy or atom-based quantum sensing systems. Strategic Positioning & Ecosystem Integration The strategic investment aims to capture localized economic value from the commercialization of frontier technologies, aligning with long-term regional macro-projections. According to data from the McKinsey Quantum Technology Monitor 2026, the commercial scaling of quantum computing use cases is projected to generate up to $2.7 trillion in global economic value by 2035. On a
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quantum-computingQuantum Doeblin Coefficients: Interpretations and Applications
AbstractIn classical information theory, the Doeblin coefficient of a classical channel provides an efficiently computable upper bound on the total-variation contraction coefficient of the channel, leading to what is known as a strong data-processing inequality. Here, we investigate quantum Doeblin coefficients as a generalization of the classical concept. In particular, we define various new quantum Doeblin coefficients, one of which has several desirable properties, including concatenation and multiplicativity, in addition to being efficiently computable. We also develop various interpretations of two of the quantum Doeblin coefficients, including representations as minimal singlet fractions, exclusion values, reverse max-mutual and oveloH informations, reverse robustnesses, and hypothesis testing reverse mutual and oveloH informations. Our interpretations of quantum Doeblin coefficients as either entanglement-assisted or unassisted exclusion values are particularly appealing, indicating that they are proportional to the best possible error probabilities one could achieve in state-exclusion tasks by making use of the channel. We also outline various applications of quantum Doeblin coefficients, ranging from limitations on quantum machine learning algorithms that use parameterized quantum circuits (noise-induced barren plateaus), on error mitigation protocols, on the sample complexity of noisy quantum hypothesis testing, on the fairness of noisy quantum models, and on mixing, indistinguishability, and decoupling times of time-varying channels. All of these applications make use of the fact that quantum Doeblin coefficients appear in upper bounds on various trace-distance contraction coefficients of a quantum channel. Furthermore, in all of these applications, our analysis using quantum Doeblin coefficients provides improvements of various kinds over contributions from prior literature, both in terms of generality and being efficiently computable.► BibTeX data@artic
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quantum-computingFramework Optimises Quantum Cloning and Extracts 100s of Operators
Jörg Hettel and colleagues at University of Applied Sciences Kaiserslautern present a computational framework using semidefinite programming to optimise cloning processes. The approach overcomes limitations in analytical methods by providing explicit operator representations for various cloning scenarios, including universal, phase-covariant, asymmetric, and entanglement cloning. The research delivers a key, unified catalogue of implementable Kraus representations and enables quantitative security analysis of quantum key distribution protocols, such as BB84, under realistic noise conditions, with an openly available set of tools for wider scientific scrutiny. Optimised quantum cloning via semidefinite programming and operator extraction Fidelity improvements of up to 15% have been achieved in quantum cloning, surpassing the 82% limit previously attained with analytical methods for universal 1→2 cloning. This breakthrough arises from a new computational framework that unlocks explicit operator representations previously inaccessible for complex cloning scenarios. At University of Applied Sciences Kaiserslautern, Jan-Niklas Bäuerle, Markus Müller, and Rainer Siegmund developed a method utilising semidefinite programming and the Choi-Jamiolkowski isomorphism to systematically optimise cloning processes across universal, phase-covariant, asymmetric, and entanglement families. The framework numerically certifies global optimality and automatically extracts operational Kraus operators, essential tools for describing quantum operations, from the optimal solution via spectral decomposition. Applying this to a cloning attack on the BB84 quantum key distribution protocol, under realistic conditions of depolarizing noise, reveals how the extracted operators enable detailed security analysis. An open-source implementation further validates the work and encourages wider adoption, although scaling the computational resources remains a substantial challenge, limiting the practical
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quantum-computingDevice-Independent Quantum Secret Sharing Protocol Enhanced by Advantage Distillation
--> Quantum Physics arXiv:2605.21880 (quant-ph) [Submitted on 21 May 2026] Title:Device-Independent Quantum Secret Sharing Protocol Enhanced by Advantage Distillation Authors:Yong-Hui Yang, Jian-Hong Shi, Hong-Wei Li, Hai-Long Zhang, Yun-Teng Yang, Yu-Bing Zhu, Yan-Yang Zhou View a PDF of the paper titled Device-Independent Quantum Secret Sharing Protocol Enhanced by Advantage Distillation, by Yong-Hui Yang and 5 other authors View PDF HTML (experimental) Abstract:Device-independent quantum secret sharing (DI-QSS) provides high security by eliminating the need to trust devices, yet its practical performance is limited by channel loss and noise. This work extends advantage distillation from two-party quantum key distribution (QKD) to three-party DI-QSS, redesigning the corresponding data interaction and verification procedures. The technique is systematically applied to the basic protocol and three active improvement strategies: noise preprocessing, post-selection, and their combination. This approach enhances noise tolerance, reduces the required global detection efficiency threshold, and significantly extends the maximum secure communication distance. Numerical simulations demonstrate that for the basic protocol over fiber, the maximum secure distance increases from 0.16 km to 1.85 km, and the noise tolerance improves from 10.17% to 28.49%. The results show that generalizing advantage distillation to the three-party setting effectively strengthens the protocol's robustness and practicality, enhancing its adaptability to realistic noise and advancing the development of more reliable quantum secret sharing systems. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2605.21880 [quant-ph] (or arXiv:2605.21880v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.21880 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Yonghui Yang [view email] [v1] Thu, 21 May 2026 01:42:22 UTC (1,641 KB) Full-t
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quantum-computingPhase-tunable remote nonreciprocal charging in waveguide QED
--> Quantum Physics arXiv:2605.21909 (quant-ph) [Submitted on 21 May 2026] Title:Phase-tunable remote nonreciprocal charging in waveguide QED Authors:Meixi Guo, Jian Huang, Rui-Yang Gong, Xian-Li Yin, Guofeng Zhang View a PDF of the paper titled Phase-tunable remote nonreciprocal charging in waveguide QED, by Meixi Guo and 4 other authors View PDF HTML (experimental) Abstract:Remote quantum batteries require directional and controllable energy transfer between spatially separated quantum nodes, yet most existing protocols rely on direct charger-battery Hamiltonian couplings. Here we propose a phase-tunable waveguide-QED architecture for remote quantum-battery charging, in which a driven charger and a remote battery are coupled solely via engineered waveguide-mediated interference, without any direct local interaction. We systematically compare four configurations: two-giant-emitter and giant-small-emitter hybrids, each with open or mirror-terminated waveguides. By engineering the propagation and coupling phases, the waveguide-mediated coherent exchange interaction and collective dissipation can be balanced to suppress the backward channel while retaining a finite forward channel, thereby realizing cascaded-like unidirectional charging. Our analysis shows that nonreciprocity and storage efficiency can be independently engineered, offering design flexibility for different quantum network scenarios. The giant-small-emitter mirror-terminated configuration simultaneously achieves perfect nonreciprocity and battery-dominated storage, while both giant-small-emitter configurations exhibit distance-insensitive directionality. Extending the scheme to quadratic driving, we show that anomalous second moments render the battery state non-passive, making ergotropy a performance metric distinct from stored energy. These results establish phase-tunable waveguide networks as a versatile platform for remote quantum-energy transfer and provide design principles for directional and wor
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quantum-computingInput, Output, Insight: Inference from Black Boxes – Contextuality, Bell Inequalities, and Beyond
Dates: Wednesday, October 14, 2026 to Saturday, October 17, 2026 Web page: 871. WE-Heraeus-Seminar Registration deadline: Sunday, July 5, 2026 Submission deadline: Sunday, July 5, 2026 Tags: quantum information theory cryptography quantum communication contextuality The 871st WE-Heraeus Seminar, titled Input, Output, Insight: Inference from Black Boxes – Contextuality, Bell Inequalities, and Beyond, will take place at the Physikzentrum Bad Honnef, Germany, between 14.10.2026 and 17.10.2026. This seminar will bring together experts working on various forms of system-agnostic methods in quantum information, including contextuality, communication matrices, device-independent cryptography, and other approaches in which quantum devices are treated as uncharacterized black boxes with inputs and outputs. Participants will come from both academia and industry, including early-career researchers and PhD students. The goal of the seminar is to discuss and compare different methods, encourage cross-pollination of ideas, and explore recent theoretical progress and applications in quantum computing, quantum key distribution, and related areas. Invited speakers include: Adán Cabello, University of Seville, Spain Péter Frenkel, Alfréd Rényi Institute of Mathematics, Hungary Mariami Gachechiladze, TU Darmstadt, Germany Markus Müller, Institute for Quantum Optics and Quantum Information, Austria Victoria Wright, Quantinuum, UK Zhen-Peng Xu, Anhui University, China Sixia Yu, University of Science and Technology of China and others. The registration and submission deadline is 5.7.2026. Participants may apply to present their work in the form of a contributed talk or poster. There is no fee for participants: the conference fee, accommodation, and meals will be fully covered by the Wilhelm and Else Heraeus Foundation. Participants are responsible only for their own travel expenses. The seminar is organized by Martin Plávala and René Schwonnek.
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quantum-computingUniversity of South Carolina Establishes National-Level Quantum Senior External Advisors to Strengthen Research and Education
Insider Brief The University of South Carolina appointed former NASA SCaN Chief Scientist Dr. Nasser Barghouty and former DHS emerging technologies advisor Jalal Mapar to multi-year Senior External Advisor roles aimed at expanding the university’s quantum information science and technology initiatives. Over the next two years, the advisors will support applied quantum research, faculty and student collaboration, and strategic program development tied to South Carolina’s broader quantum ecosystem and workforce goals. The appointments build on South Carolina’s 2023 commitment of $15 million toward statewide quantum readiness and are intended to connect university-led research with national security, infrastructure, and economic priorities. PRESS RELEASE — The University of South Carolina (USC) has established two multi-year university Senior External Advisor roles designed to strengthen advanced research, education, and program development in quantum information science. The agreements bring two nationally recognized leaders in science and technology to South Carolina: Dr. Nasser F. Barghouty, former Chief Scientist for NASA’s Space Communications and Navigation Program (SCaN) at NASA headquarters, and Jalal Mapar, former Senior Advisor for Emerging Technologies at the Department of Homeland Security’s Science and Technology Directorate. Over a two-year engagement, the Senior External Advisors will contribute to applied research in quantum information science and technology (QIST) related initiatives, collaborate with faculty and students, and support the development of strategic programs that advance University of South Carolina’s growing quantum ecosystem. Their work will span strategy and technical development, research advising, and academic collaboration, strengthening institutional capacity across multiple disciplines. Dr. Barghouty previously led NASA’s quantum communications and networking strategy and had spent two decades advancing research and flight progra
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quantum-computingRecruitment of Post Doctoral Fellows for research project on quantum computing and quantum information/communication.
Recruitment of Post Doctoral Fellows for research project on quantum computing and quantum information/communication. Application deadline: Tuesday, June 30, 2026Employer web page: https://www.tcgcrest.org/institutes/cquere/Job type: PostDocTags: quantum computingquantum informationpostdocThe Centre for Quantum Engineering, Research and Education (CQuERE) is one of the centres at TCG CREST, Kolkata, India. The theoretical areas of research currently being pursued at CQuERE are quantum computation, quantum algorithms, quantum machine learning, quantum information, quantum communication, and quantum cryptography. In addition, there are experimental activities in the areas of quantum sensing and superconducting-qubit-based quantum computing. CQuERE has openings for postdoctoral positions in the areas of theoretical quantum computing, quantum information, and quantum communication, with emphasis on translational research. These positions are for one year and can be extended to a second year depending on the performance of the candidates. The remuneration for this position will be at par with the other research institutes in India. Eligibility: PhD in Physics, Mathematics, Chemistry, Computer Science or Engineering. Eligible candidates can send a cover letter, research plan, curriculum vitae, and two reference letters to cquere.applications@tcgcrest.org with the subject “Application for a post-doctoral position”. Reference letters should be sent directly by the referees. The deadline for the receipt of applications and reference letters is 30th June 2026. Job Requirement: Strong background in theoretical quantum physics and /or quantum chemistry with a background in quantum computing and quantum information/communication. Non Indian citizens are also eligible to apply. No. of posts: 1 or 2 (One or Two) Salary: The remuneration for this position will be at par with the other research institutes in India. Tenure: These positions are for one year and can
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quantum-computingToshiba and Quantum Bridge Demonstrate Quantum-Safe Global Networking
Insider Brief Toshiba Europe Limited and Quantum Bridge Technologies demonstrated an international quantum-safe communication network combining QKD and DSKE technologies. The system connected QKD networks in Cambridge and Toronto using existing fibre infrastructure and interoperability standards. The demonstration showed how provably secure communication could be extended beyond metropolitan QKD networks to global-scale deployments. PRESS RELEASE — Toshiba Europe Limited (Toshiba) and Quantum Bridge Technologies Inc. (QBT) today announced the successful demonstration of an international communication network delivering provably secure, quantum-safe data transmission. The system integrates Toshiba’s Quantum Key Distribution (QKD) technology with QBT’s Distributed Symmetric Key Establishment (DSKE) platform and was deployed on field-installed fibre infrastructure in collaboration with Telehouse Canada Inc. (Telehouse), a subsidiary of KDDI Corporation. The milestone demonstration, unveiled at the Optical Fiber Communication Conference (OFC) 2026, shows how existing metropolitan QKD networks can be interconnected across continents using DSKE. By leveraging carrier-grade infrastructure and emerging interoperability standards, the project represents an important step toward practical, global-scale communication that remains secure even in the era of quantum computing. Advancing Information-Theoretic Security The network is based on information-theoretic security (ITS), also known as provable security. This model ensures that confidential data remains protected regardless of the computational power available to an attacker, offering resilience not only against current threats but also against future advances in supercomputing and large-scale quantum computing. QKD is already widely deployed to deliver provable security, with numerous fibre-based metropolitan QKD networks operating worldwide. However, extending this level of pro
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quantum-computingOrbital-Angular-Momentum Entangled Photon Emission from Circular Currents in Semiconductor-Superconductor Structures
--> Quantum Physics arXiv:2605.20329 (quant-ph) [Submitted on 19 May 2026] Title:Orbital-Angular-Momentum Entangled Photon Emission from Circular Currents in Semiconductor-Superconductor Structures Authors:Avi Koriat, Ankit Kumar, Alex Hayat View a PDF of the paper titled Orbital-Angular-Momentum Entangled Photon Emission from Circular Currents in Semiconductor-Superconductor Structures, by Avi Koriat and 2 other authors View PDF Abstract:We theoretically demonstrate that a superconducting circular current induced in a semiconductor results in emission of orbital-angular-momentum (OAM) entangled photon pairs upon carrier recombination. Combining the macroscopic Ginzburg-Landau theory and the microscopic Bardeen-Cooper-Schrieffer (BCS) theory, we investigate the emission of a superconducting light-emitting diode (SLED) with a spatially varying phase profile in the superconducting order parameter. We show that in the active region of the SLED with a circular supercurrent, radiative recombination processes inherit the order parameter phase and result in photon pairs emitted into modes of different OAM quantum numbers. We demonstrate that coherent superposition of superconducting qubit eigenstates can also be mapped onto a coherent superposition of emitted photon states. We also show that other recombination processes due to thermally excited quasi particles do not significantly degrade the state purity. Our results introduce an original scheme for generating OAM-entangled photons enabling a new method of transmitting superconducting qubit information to photonic channels thereby bridging the gap between solid-state and photon-based platforms for quantum communications and information processing. Subjects: Quantum Physics (quant-ph); Superconductivity (cond-mat.supr-con) Cite as: arXiv:2605.20329 [quant-ph] (or arXiv:2605.20329v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.20329 Focus to learn more arXiv-issued DOI via DataCite (pendin
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quantum-computingCompact narrowband photon-pair generation by slow-light spectral engineering
--> Quantum Physics arXiv:2605.20447 (quant-ph) [Submitted on 19 May 2026] Title:Compact narrowband photon-pair generation by slow-light spectral engineering Authors:Ashwith Prabhu, Elizabeth A. Goldschmidt View a PDF of the paper titled Compact narrowband photon-pair generation by slow-light spectral engineering, by Ashwith Prabhu and Elizabeth A. Goldschmidt View PDF HTML (experimental) Abstract:Efficiently generating photon pairs with high heralding efficiency and high single photon purity that are bandwidth matched to quantum emitters, quantum memories, and other matter-based qubits is critical for quantum networking applications. However, nonlinear optics-based sources require substantial spectral engineering to overcome the orders of magnitude bandwidth mismatch between those sources and qubit systems. A popular solution is cavity-enhanced spontaneous parametric down conversion (SPDC) where the cavity sets the photon bandwidth and simultaneously enhances the spectral brightness of the SPDC. Bulk, free-space configurations are generally required to achieve the MHz-scale bandwidths required to interface with most qubit systems. Replicating these in scalable integrated photonic architectures is an ongoing challenge due to the much higher propagation losses that limit the size and linewidth of chip-based resonators. We show here how an intra-cavity slow light medium, acting as an ultra-narrow filter, would enable narrowband photon pair generation in broadband cavities with high single photon purity and without compromising the heralding efficiency. We show that such metrics can be readily realized in erbium doped thin-film lithium niobate microrings using realistic design parameters. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2605.20447 [quant-ph] (or arXiv:2605.20447v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.20447 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Ashwi
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quantum-computingOne-Dimensional Nonlinear Quantum Walks
--> Quantum Physics arXiv:2605.20464 (quant-ph) [Submitted on 19 May 2026] Title:One-Dimensional Nonlinear Quantum Walks Authors:Yujia Shi, Thomas G. Wong View a PDF of the paper titled One-Dimensional Nonlinear Quantum Walks, by Yujia Shi and 1 other authors View PDF HTML (experimental) Abstract:We explore a continuous-time quantum walk starting at a single vertex on the discrete path and cycle with a cubic nonlinearity. Such nonlinearities arise in Bose-Einstein condensates described by the Gross-Pitaevskii equation or by nonlinear optical waveguide arrays. We analytically prove that the nonlinear quantum walk can be trapped to arbitrary fidelity depending on the coefficient of the nonlinear term. This contrasts with linear quantum walks, which are known for spreading quickly in one dimension. We propose that this trapping can be used for timing in quantum state transfer, where a qubit is held at a node until it is ready to be transferred, and it can also be held again at the receiving node. This scheme can also be interpreted as a form of quantum memory, with the trap and transfer corresponding to the storage and release of quantum information. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2605.20464 [quant-ph] (or arXiv:2605.20464v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.20464 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Yujia Shi [view email] [v1] Tue, 19 May 2026 20:24:51 UTC (151 KB) Full-text links: Access Paper: View a PDF of the paper titled One-Dimensional Nonlinear Quantum Walks, by Yujia Shi and 1 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev | next > new | recent | 2026-05 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliograp
arXiv Quantum PhysicsLoading...0