Composable Finite-Size Security of High-Dimensional Quantum Key Distribution Protocols

• URL: http://arxiv.org/abs/2505.03874v1
• Date: Tue, 06 May 2025 18:00:01 GMT
• Title: Composable Finite-Size Security of High-Dimensional Quantum Key Distribution Protocols
• Authors: Florian Kanitschar, Marcus Huber,
• Abstract summary: We present a composable finite-size security proof against both collective and coherent attacks for a general HD QKD protocol.<n>We also provide a practical variable-length security argument that yields significantly higher expected key rates.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Practical implementations of Quantum Key Distribution (QKD) extending beyond urban areas commonly use satellite links. However, the transmission of quantum states through the Earth's atmosphere is highly susceptible to noise, restricting its application primarily to nighttime. High-dimensional (HD) QKD offers a promising solution to this limitation by employing high-dimensionally entangled quantum states. Although experimental platforms for HD QKD exist, previous security analyses were limited to the asymptotic regime and have either relied on impractical measurements or employed computationally demanding convex optimization tasks restricting the security analysis to low dimensions. In this work, we bridge this gap by presenting a composable finite-size security proof against both collective and coherent attacks for a general HD QKD protocol that utilizes only experimentally accessible measurements. In addition to the conventional, yet impractical `one-shot' key rates, we also provide a practical variable-length security argument that yields significantly higher expected key rates. This approach is particularly crucial for rapidly changing and turbulent atmospheric conditions, as encountered for free-space and satellite-based QKD platforms.

Related papers

• Device-Independent Ternary Quantum Key Distribution Protocol Based on the Impossible Colouring Game [0.59374762912328]
  We propose a quantum key distribution protocol based on the two-party Impossible Colouring pseudo-telepathy game.<n>The protocol makes use of non-contextuality from the Kochen-Specker theorem, providing a quantum advantage in a task that is classically unachievable.<n>The protocol is secure within an adequate security framework and demonstrates a higher key generation rate compared to standard QKD protocols.
  arXiv  Detail & Related papers  (2025-05-21T14:52:31Z)
• Blockwise Post-processing in Satellite-based Quantum Key Distribution [49.84121978591396]
  We argue that improving classical post-processing is an important direction in increasing key rate in satellite-based QKD.<n>In particular, we explore one direction, blockwise post-processing, to address highly dynamic satellite channel conditions.
  arXiv  Detail & Related papers  (2025-03-08T03:06:04Z)
• Application of $α$-order Information Metrics for Secure Communication in Quantum Physical Layer Design [45.41082277680607]
  We study the $alpha$-order information-theoretic metrics based on R'enyi entropy.<n>We apply our framework to a practical scenario involving BPSK modulation over a lossy bosonic channel.
  arXiv  Detail & Related papers  (2025-02-07T03:44:11Z)
• Practical hybrid PQC-QKD protocols with enhanced security and performance [44.8840598334124]
  We develop hybrid protocols by which QKD and PQC inter-operate within a joint quantum-classical network. In particular, we consider different hybrid designs that may offer enhanced speed and/or security over the individual performance of either approach.
  arXiv  Detail & Related papers  (2024-11-02T00:02:01Z)
• Quantum-Secured Data Centre Interconnect in a field environment [38.4938584033229]
  Quantum key distribution (QKD) is an established quantum technology at a high readiness level. In this article, we present the successful implementation of a QKD field trial within a commercial data centre environment. The achieved average secret key rate of 2.392 kbps and an average quantum bit error rate of less than 2% demonstrate the commercial feasibility of QKD in real-world scenarios.
  arXiv  Detail & Related papers  (2024-10-14T08:05:25Z)
• One-sided DI-QKD secure against coherent attacks over long distances [0.0]
  Device-Independent (DI) QKD protocols overcome this issue by making minimal device assumptions. We show that a one-sided DI QKD scheme with two measurements per party is secure against coherent attacks up to detection efficiencies greater than 50.1% specifically on the untrusted side. We also show that, by placing the source of states close to the untrusted side, our protocol is secure over distances comparable to standard QKD protocols.
  arXiv  Detail & Related papers  (2024-03-18T15:01:17Z)
• Finite-Key Analysis for Coherent One-Way Quantum Key Distribution [18.15943439545963]
  Coherent-one-way (COW) quantum key distribution (QKD) is a significant communication protocol that has been implemented experimentally and deployed in practical products. Existing security analyses of COW-QKD either provide a short transmission distance or lack immunity against coherent attacks in the finite-key regime. We present a tight finite-key framework for a variant of COW-QKD, which has been proven to extend the secure transmission distance in the case.
  arXiv  Detail & Related papers  (2023-09-28T03:32:06Z)
• Harnessing high-dimensional temporal entanglement using limited interferometric setups [41.94295877935867]
  We develop the first complete analysis of high-dimensional entanglement in the polarization-time-domain. We show how to efficiently certify relevant density matrix elements and security parameters for Quantum Key Distribution. We propose a novel setup that can further enhance the noise resistance of free-space quantum communication.
  arXiv  Detail & Related papers  (2023-08-08T17:44:43Z)
• Improved coherent one-way quantum key distribution for high-loss channels [0.0]
  We present a simple variant of COW-QKD and prove its security in the infinite-key limit. Remarkably, the resulting key rate of our protocol is comparable with both the existing upper-bound on COW-QKD key rate and the secure key rate of the coherent-state BB84 protocol.
  arXiv  Detail & Related papers  (2022-06-17T00:07:03Z)
• Finite resource performance of small satellite-based quantum key distribution missions [36.136619420474766]
  Recent developments in finite key analysis allow three small-satellite-based QKD projects to produce secret keys even under very high loss conditions. We highlight the short and long-term perspectives on the challenges and potential future developments in small-satellite-based QKD and quantum networks.
  arXiv  Detail & Related papers  (2022-04-26T18:00:03Z)
• Towards fully-fledged quantum and classical communication over deployed fiber with up-conversion module [47.187609203210705]
  We propose and demonstrate a new method, based on up-conversion assisted receiver, for co-propagating classical light and QKD signals. Our proposal exhibits higher tolerance for noise in comparison to the standard receiver, thus enabling the distribution of secret keys in the condition of 4 dB-higher classical power.
  arXiv  Detail & Related papers  (2021-06-09T13:52:27Z)
• Upper security bounds for coherent-one-way quantum key distribution [0.0]
  Coherent-one-way (COW) QKD has been introduced as a promising solution to overcome this limitation. Thanks to its experimental simplicity, the COW protocol is already used in commercial applications. We derive simple upper security bounds on its secret key rate, which demonstrate that it scales at most quadratically with the system's transmittance.
  arXiv  Detail & Related papers  (2020-06-30T15:20:08Z)

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.