Improving device-independent quantum key distribution protocols through multiple routed Bell tests

• URL: http://arxiv.org/abs/2606.26329v1
• Date: Wed, 24 Jun 2026 19:14:44 GMT
• Title: Improving device-independent quantum key distribution protocols through multiple routed Bell tests
• Abstract summary: Device-independent quantum key distribution (DI-QKD) offers security with the smallest possible set of assumptions.<n>We propose a DI-QKD protocol based on multiple sources and measurement devices where, in each round, routed tests are performed on randomly selected local devices.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Device-independent quantum key distribution (DI-QKD) offers security with the smallest possible set of assumptions about the experimental setup. The challenge posed by its implementation could be tackled using routed Bell tests with entanglement swapping, or distant Bell state measurement (BSM) units. However, practical distances still require local tests with close-to-ideal violations. We propose a DI-QKD protocol based on multiple sources and measurement devices where, in each round, routed tests are performed on randomly selected local devices. The violation of local Bell tests is checked even when a successful BSM projection is achieved. By requiring that such conditional tests remain consistent with the overall one, we achieve improvements in the critical detection efficiencies of about $4-12\%$ for high visibilities. Our approach enables long-distance DI-QKD, with access to highly efficient loophole-free routing setups, and multiple local tests (possibly imperfect) with very high local detection efficiencies. Finally, we extend the concept of routing to dimension witnesses, where qubit-bounded sources send states to the BSM. This can be seen as a semi-device-independent extension of the aforementioned protocol.

Related papers

• Robust Device-Independent Certification of Boolean-Phase Gates [43.185722326013035]
  Device-independent certification of a quantum gate requires the input and output tests to identify the same reference qubits.<n>We develop a robust certification scheme for Boolean-phase gates.<n>We show how the algebraic structure of a gate can shift target-dependent information from quantum measurement design to classical processing of local outcomes.
  arXiv  Detail & Related papers  (2026-09-09T07:41:09Z)
• Efficient Verification of Entangled Measurements with Local States [41.58226483686176]
  We develop a framework for quantum measurement verification using only local state preparations.<n>We prove that symmetry reduces locality constrained QMV to quantum state verification of a single basis state.<n>We derive explicit local protocols together with closed form verification operators, success probabilities, and sample complexities.
  arXiv  Detail & Related papers  (2026-06-19T11:55:21Z)
• Routed Bell tests with arbitrarily many local parties [7.23124249368034]
  Routed Bell tests have recently re-emerged as a promising strategy to mitigate this limitation.<n>We introduce a modified setup that enables local self-tests for both Alice and Bob.<n>We find that perfect local Bell tests can, in principle, overcome the detection-efficiency barrier.
  arXiv  Detail & Related papers  (2025-10-09T16:24:11Z)
• CANTXSec: A Deterministic Intrusion Detection and Prevention System for CAN Bus Monitoring ECU Activations [53.036288487863786]
  We propose CANTXSec, the first deterministic Intrusion Detection and Prevention system based on physical ECU activations.<n>It detects and prevents classical attacks in the CAN bus, while detecting advanced attacks that have been less investigated in the literature.<n>We prove the effectiveness of our solution on a physical testbed, where we achieve 100% detection accuracy in both classes of attacks while preventing 100% of FIAs.
  arXiv  Detail & Related papers  (2025-05-14T13:37:07Z)
• Almost device-independent calibration beyond Born's rule: Bell tests for cross-talk detection [0.0]
  Device-independent protocols offer a new approach to information processing tasks.<n>We demonstrate how to test premises in an (almost) device-independent setting.<n>For IBM's quantum computing cloud services, we implement the prediction-based ratio protocol.
  arXiv  Detail & Related papers  (2025-03-24T17:59:58Z)
• Certification of quantum correlations and DIQKD at arbitrary distances through routed Bell tests [0.0]
  We investigate the concept of routed Bell experiments, in which a particle sent to one side can be measured either near or far from the source.<n>We prove that routed Bell tests involving only entangled qubits can certify quantum correlations even in the presence of arbitrary loss on the channel to the distant device.
  arXiv  Detail & Related papers  (2025-02-17T19:00:01Z)
• Loss-tolerant quantum key distribution with detection efficiency mismatch [39.58317527488534]
  We establish a security proof for the loss-tolerant P&M QKD protocol that incorporates imperfections in both the source and the detectors.<n>Specifically, we demonstrate the security of this scheme when the emitted states deviate from the ideal ones.
  arXiv  Detail & Related papers  (2024-12-12T19:01:56Z)
• Certifying classes of $d$-outcome measurements with quantum steering [49.1574468325115]
  We provide a construction of a family of steering inequalities tailored to large classes of $d$-outcomes projective measurements. We prove that the maximal quantum violation of those inequalities can be used for certification of those measurements and the maximally entangled state of two qudits.
  arXiv  Detail & Related papers  (2024-10-27T15:32:53Z)
• Orthogonal-state-based Measurement Device Independent Quantum Communication [32.244698777387995]
  We propose a new protocol of measurement-device-independent quantum secure direct communication and quantum dialogue employing single basis, i.e., Bell basis as decoy qubits for eavesdropping detection. Our protocols leverage fundamentally distinct resources to close the security loopholes linked to measurement devices, while also effectively doubling the distance for secure direct message transmission.
  arXiv  Detail & Related papers  (2024-09-30T15:57:17Z)
• Device-Independent Quantum Key Distribution Based on Routed Bell Tests [0.0]
  In some protocols, photons from the source are routed by an actively controlled switch to a nearby test device instead of the distant one.<n>We show how to analyze the security of these protocols and compute lower bounds on the key rates.<n>For high-quality short-path tests, we find that routed DIQKD protocols are significantly more robust to losses.
  arXiv  Detail & Related papers  (2024-04-01T15:59:09Z)
• Entropy bounds for device-independent quantum key distribution with local Bell test [0.0]
  One of the main challenges in device-independent quantum key distribution (DIQKD) is achieving the required Bell violation over long distances. Recent works have explored the concept of certifying nonlocal correlations over extended distances through the use of a local Bell test. Here, an additional quantum device is placed in close proximity to one party, using short-distance correlations to verify nonlocal behavior at long distances.
  arXiv  Detail & Related papers  (2024-03-31T20:33:40Z)
• Measurement-Device-Independent Detection of Beyond-Quantum State [53.64687146666141]
  We propose a measurement-device-independent (MDI) test for beyond-quantum state detection. We discuss the importance of tomographic completeness of the input sets to the detection.
  arXiv  Detail & Related papers  (2023-12-11T06:40:13Z)
• Single-photon-memory measurement-device-independent quantum secure direct communication [63.75763893884079]
  Quantum secure direct communication (QSDC) uses the quantum channel to transmit information reliably and securely. In order to eliminate the security loopholes resulting from practical detectors, the measurement-device-independent (MDI) QSDC protocol has been proposed. We propose a single-photon-memory MDI QSDC protocol (SPMQC) for dispensing with high-performance quantum memory.
  arXiv  Detail & Related papers  (2022-12-12T02:23:57Z)
• Sample-efficient device-independent quantum state verification and certification [68.8204255655161]
  Authentication of quantum sources is a crucial task in building reliable and efficient protocols for quantum-information processing. We develop a systematic approach to device-independent verification of quantum states free of IID assumptions in the finite copy regime. We show that device-independent verification can be performed with optimal sample efficiency.
  arXiv  Detail & Related papers  (2021-05-12T17:48:04Z)
• Round-robin differential phase-time-shifting protocol for quantum key distribution: theory and experiment [58.03659958248968]
  Quantum key distribution (QKD) allows the establishment of common cryptographic keys among distant parties. Recently, a QKD protocol that circumvents the need for monitoring signal disturbance, has been proposed and demonstrated in initial experiments. We derive the security proofs of the round-robin differential phase-time-shifting protocol in the collective attack scenario. Our results show that the RRDPTS protocol can achieve higher secret key rate in comparison with the RRDPS, in the condition of high quantum bit error rate.
  arXiv  Detail & Related papers  (2021-03-15T15:20:09Z)

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.