Deployed quantum key distribution network: further, longer and more users

• URL: http://arxiv.org/abs/2511.02578v1
• Date: Tue, 04 Nov 2025 13:55:47 GMT
• Title: Deployed quantum key distribution network: further, longer and more users
• Abstract summary: Entanglement-based quantum links are the backbone of future quantum internet networks.<n>We maintain an operational QKD link continuously for 325hours over 50km between two remotes locations.<n>We further extended secure key distribution up to a 100km operational link connecting the University of Nice to a ground-based optical station.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Entanglement-based quantum links are the backbone of future quantum internet networks, enabling secure communication between distant cities. Realizing such networks requires addressing multiple practical challenges in long-distance quantum key distribution : time synchronisation, interferometer stabilisation and automation. Here, we report several advances. First, we maintained an operational QKD link continuously for 325hours over 50km between two remotes locations, demonstrating the feasibility of long-duration key generation. We further extended secure key distribution up to a 100km operational link connecting the University of Nice to a ground-based optical station, a setup compatible with future quantum satellite connections. Finally, by employing wavelength demultiplexing to separate photons of entangled pairs, we performed QKD across multiple ITU channels, achieving secure key exchange via the BBM92 protocol and time-energy observables.

Related papers

• Quantum Clock Synchronization Networks: A Survey [44.015977790437454]
  Quantum clock synchronization (QCS) aims to establish a shared temporal reference between distant nodes.<n>QCS protocols offer the potential to surpass classical precision bounds and enhance resilience against adversarial manipulations.<n>This survey provides a unified and critical overview of the rapidly growing QCS research landscape.
  arXiv  Detail & Related papers  (2026-04-06T05:30:54Z)
• High-rate Scalable Entanglement Swapping Between Remote Entanglement Sources on Deployed New York City Fibers [37.977711964286314]
  Entanglement swapping between photon pairs generated at physically separated nodes over telecommunication fiber infrastructure is an essential step towards the quantum internet.<n>We demonstrate a scalable entanglement swapping experiment using naturally indistinguishable entanglement sources based on warm atomic vapor cells.<n>Our work paves the way for the practical deployment of large-scale hub-and-spoke quantum networks within cities and data centers.
  arXiv  Detail & Related papers  (2026-02-17T15:27:03Z)
• A building block of quantum repeaters for scalable quantum networks [31.28992546873135]
  We develop and maintain memory-memory entanglement over a 10 km fibre within the average entanglement establishment time.<n>As a direct application, we demonstrate 1,917 secret keys out of 4.05*105 Bell pairs over 10 km.
  arXiv  Detail & Related papers  (2026-02-09T10:19:31Z)
• A measurement-device-independent quantum key distribution network using optical frequency comb [2.87085365395994]
  Quantum key distribution (QKD) promises secure key exchange between two remote parties.<n>We propose and experimentally demonstrate a fully connected multi-user QKD network based on a wavelength-multiplexed measurement-device-independent (MDI) QKD protocol.
  arXiv  Detail & Related papers  (2025-02-17T14:52:22Z)
• Emulation of satellite up-link quantum communication with entangled photons [75.38606213726906]
  We demonstrate an ultra-bright source of far-non-degenerate entangled photons and perform quantum key distribution in emulated high-loss satellite scenarios.<n>With a loss profile corresponding to that of one of the pioneering Micius up-link experiments, and a terrestrial end user separated by 10km of telecom fibre we achieve secure key accumulation of 5.2kbit in a single overpass in the limit.
  arXiv  Detail & Related papers  (2025-02-05T19:14:55Z)
• Heralded entanglement of on-demand spin-wave solid-state quantum memories for multiplexed quantum network links [0.0]
  We show telecom heralded entanglement between spatially separated spin-wave quantum memories with fully adjustable recall time and temporal multiplexing of 15 modes.<n>Results establish our architecture as a prime candidate for the implementation of scalable high-rate quantum network links.
  arXiv  Detail & Related papers  (2025-01-07T20:26:06Z)
• Metropolitan-scale heralded entanglement of solid-state qubits [0.0]
  We report on heralded entanglement between two independently operated quantum network nodes separated by 10km. We minimize the effects of fiber photon loss by quantum frequency conversion of the qubit-stabilized photons to the telecom L-band. We demonstrate the delivery of a predefined entangled state on the nodes irrespective of the heralding detection pattern.
  arXiv  Detail & Related papers  (2024-04-04T18:00:01Z)
• Single-emitter quantum key distribution over 175 km of fiber with optimised finite key rates [45.82374977939355]
  We perform fibre-based quantum key distribution with a quantum dot frequency-converted to telecom wavelength. We demonstrate positive key rates up to 175 km in the regime. This result represents major progress towards the feasibility of long-distance single-emitter QKD networks.
  arXiv  Detail & Related papers  (2022-09-07T18:03:36Z)
• Experimental mode-pairing measurement-device-independent quantum key distribution without global phase-locking [8.687547048842761]
  We show a mode-pairing scheme for high-performance quantum key distribution without global phase-locking. We show a quadratic key-rate improvement over the conventional measurement-device-independent schemes. For longer distances, we also boost the key rate performance by three orders of magnitude via 304 km commercial fiber and 407 km ultra-low-loss fiber.
  arXiv  Detail & Related papers  (2022-08-11T05:53:08Z)
• Conference key agreement in a quantum network [67.410870290301]
  Quantum conference key agreement (QCKA) allows multiple users to establish a secure key from a shared multi-partite entangled state. In a quantum network, this protocol can be efficiently implemented using a single copy of a N-qubit Greenberger-Horne-Zeilinger (GHZ) state to distil a secure N-user conference key bit.
  arXiv  Detail & Related papers  (2022-07-04T18:00:07Z)
• Continuous entanglement distribution over a transnational 248 km fibre link [58.720142291102135]
  Entanglement is the basis of many quantum applications. We present a continuously working international link between Austria and Slovakia. We measure stable pair rates of 9 s$-1$ over an exemplary operation time of 110 hours.
  arXiv  Detail & Related papers  (2022-03-23T13:55:27Z)
• Telecom-heralded entanglement between remote multimode solid-state quantum memories [55.41644538483948]
  Future quantum networks will enable the distribution of entanglement between distant locations and allow applications in quantum communication, quantum sensing and distributed quantum computation. Here we report the demonstration of heralded entanglement between two spatially separated quantum nodes, where the entanglement is stored in multimode solid-state quantum memories. We also show that the generated entanglement is robust against loss in the heralding path, and demonstrate temporally multiplexed operation, with 62 temporal modes.
  arXiv  Detail & Related papers  (2021-01-13T14:31:54Z)
• Experimental quantum conference key agreement [55.41644538483948]
  Quantum networks will provide multi-node entanglement over long distances to enable secure communication on a global scale. Here we demonstrate quantum conference key agreement, a quantum communication protocol that exploits multi-partite entanglement. We distribute four-photon Greenberger-Horne-Zeilinger (GHZ) states generated by high-brightness, telecom photon-pair sources across up to 50 km of fibre.
  arXiv  Detail & Related papers  (2020-02-04T19:00:31Z)
• Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber [8.23629474539463]
  Quantum key distribution provides secure keys resistant to code-breaking quantum computers. Long distance continuous-variable quantum key distribution over 202.81 km of ultralow-loss optical fiber.
  arXiv  Detail & Related papers  (2020-01-08T14:50:39Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.