Experimental decoy state BB84 quantum key distribution through a turbulent channel

• URL: http://arxiv.org/abs/2012.04498v2
• Date: Fri, 19 Mar 2021 14:10:04 GMT
• Title: Experimental decoy state BB84 quantum key distribution through a turbulent channel
• Abstract summary: In free-space Quantum Key Distribution in turbulent conditions, scattering and beam wandering cause intensity fluctuations. This effect can be mitigated by rejecting received bits when the channel's transmittance is below a threshold. One promising method is the Prefixed-Threshold Real-time Selection (P-RTS)
• Score: 4.001518483170136
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In free-space Quantum Key Distribution in turbulent conditions, scattering and beam wandering cause intensity fluctuations which increase the detected signal-to-noise ratio. This effect can be mitigated by rejecting received bits when the channel's transmittance is below a threshold. Thus, the overall error rate is reduced and the secure key rate increases despite the deletion of bits. In Decoy State BB84 QKD, several methods to find the ideal threshold have already been proposed. One promising method is the Prefixed-Threshold Real-time Selection (P-RTS) where a cutoff can be chosen prior to data collection and independently of the intensity distribution. In this work we perform finite-size Decoy State BB84 QKD in a laboratory setting where we simulate the atmospheric turbulence using an acousto-optical modulator. We show that P-RTS can yield considerably higher secure key rates, especially at higher losses. In addition, we verify that P-RTS gives a robust cutoff even when the predicted transmittance does not match the actual transmittance.

Related papers

• Conditional-squeezing gate in superconducting circuits [41.99844472131922]
  We present an implementation of a conditional-squeezing gate that squeezes a SQUID-terminated resonator mode along a direction determined by the state of a dispersively coupled qubit.<n>We use the gate to encode an arbitrary qubit state into superpositions of single- and two-mode squeezed states of the resonator.
  arXiv  Detail & Related papers  (2026-09-09T16:16:48Z)
• Quantum Decision Theory for Displacement Detection with Finite-Energy GKP States [46.2474896050764]
  We develop a framework for detecting phase-space displacements with finite-energy, $d$-level Gottesman-Kitaev-Preskill (GKP) probes.<n>For single-mode and entanglement-assisted architectures, we derive the Bayesian minimum-error probability.<n>We benchmark the resulting protocols against coherent-state, direction-matched squeezed-vacuum, and twin-beam schemes.
  arXiv  Detail & Related papers  (2026-08-08T10:32:05Z)
• Spatially Adaptive Detection for Satellite-based QKD under Atmospheric Turbulence Channel [7.1500416740977455]
  Quantum key distribution (QKD) provides information-theoretic security and satellite-based quantum key distribution (SatQKD) has demonstrated the potential to extend this communication security to intercontinental scales.<n> atmospheric turbulence induces significant distortion in the spatial distribution of received optical beams, while background noise remains approximately uniform across the detector plane.<n>We propose to exploit the spatial degrees of freedom of single-photon detector arrays to reject the excessive noise while adapting to channel variations induced by turbulence.
  arXiv  Detail & Related papers  (2026-05-15T22:33:03Z)
• UAV-Deployed OAM-BB84 QKD: Turbulence- and Misalignment-Resilient Decoy-State Finite-Key Security with AI-Assisted Calibration [0.0]
  We present a theoretical framework for quantum key distribution (QKD) using orbital angular momentum encoded BB84 on an unmanned aerial vehicle (UAV) platform.<n>We derive composable finite key lower bounds on the secret key rate that incorporate statistical fluctuations, detector dark counts, efficiency mismatch, and error correction leakage.<n>We outline a complete evaluation pipeline including UAV system architecture, turbulence driven QBER maps, decoy optimization, finite key scaling, and AI calibration metrics.
  arXiv  Detail & Related papers  (2026-01-16T09:23:33Z)
• Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory [47.00474212574662]
  A superconducting qubit is coupled to a large-bandwidth readout resonator. We show a beyond-state-of-the-art two-state-readout error of only 0.25,%$ in 100 ns integration time. The presented results are expected to further boost the performance of new and existing algorithms and protocols.
  arXiv  Detail & Related papers  (2023-07-15T10:30:10Z)
• Experimental free-space quantum key distribution over a turbulent high-loss channel [0.0]
  Compared to fiber-based communication networks, free-space networks experience significantly less decoherence and photon loss. The atmospheric turbulence contributes to deviation in transmittance distribution, which introduces noise and channel loss. Active research is currently focused on establishing secure and practical quantum communication in a high-loss channel.
  arXiv  Detail & Related papers  (2023-05-02T11:47:22Z)
• Qubit readouts enabled by qubit cloaking [49.1574468325115]
  Time-dependent drives play a crucial role in quantum computing efforts. They enable single-qubit control, entangling logical operations, as well as qubit readout. Qubit cloaking was introduced in Lled'o, Dassonneville, et al.
  arXiv  Detail & Related papers  (2023-05-01T15:58:25Z)
• Phase-Matching Quantum Key Distribution without Intensity Modulation [25.004151934190965]
  We propose a phase-matching quantum key distribution protocol without intensity modulation. Simulation results show that the transmission distance of our protocol could reach 305 km in telecommunication fiber. Our protocol provides a promising solution for constructing quantum networks.
  arXiv  Detail & Related papers  (2023-03-21T04:32:01Z)
• Satellite-Based Quantum Key Distribution in the Presence of Bypass Channels [44.81834231082477]
  Security of quantum key distribution under restricted eavesdropping scenarios is addressed. We find regimes of operation in which the above restrictions on Eve can considerably improve system performance. Our work opens up new security frameworks for spaceborne quantum communications systems.
  arXiv  Detail & Related papers  (2022-12-09T12:24:40Z)
• Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter [62.997667081978825]
  We introduce a low-overhead protocol to reverse this degradation. We present two trapped-ion schemes for the implementation of a non-unitary probabilistic filter against amplitude damping noise. This filter can be understood as a protocol for single-copy quasi-distillation.
  arXiv  Detail & Related papers  (2022-09-06T18:18:41Z)
• Modelling efficient BB84 with applications for medium-range, terrestrial free-space QKD [0.0]
  Terrestrial free-space quantum key distribution is ideally suited for deployment in dense urban environments. We investigate issues for efficient BB84 using a weak coherent pulse-decoy state protocol.
  arXiv  Detail & Related papers  (2022-07-05T13:21:58Z)
• High-Order Qubit Dephasing at Sweet Spots by Non-Gaussian Fluctuators: Symmetry Breaking and Floquet Protection [55.41644538483948]
  We study the qubit dephasing caused by the non-Gaussian fluctuators. We predict a symmetry-breaking effect that is unique to the non-Gaussian noise.
  arXiv  Detail & Related papers  (2022-06-06T18:02:38Z)
• Stabilization of Qubit Relaxation Rates by Frequency Modulation [68.8204255655161]
  Temporal, spectral, and sample-to-sample fluctuations in coherence properties of qubits form an outstanding challenge for the development of upscaled fault-tolerant quantum computers. A ubiquitous source for these fluctuations in superconducting qubits is a set of atomic-scale defects with a two-level structure. We show that frequency modulation of a qubit or, alternatively, of the two-level defects, leads to averaging of the qubit relaxation rate over a wide interval of frequencies.
  arXiv  Detail & Related papers  (2021-04-08T11:32:03Z)
• Composably secure data processing for Gaussian-modulated continuous variable quantum key distribution [58.720142291102135]
  Continuous-variable quantum key distribution (QKD) employs the quadratures of a bosonic mode to establish a secret key between two remote parties. We consider a protocol with homodyne detection in the general setting of composable finite-size security. In particular, we analyze the high signal-to-noise regime which requires the use of high-rate (non-binary) low-density parity check codes.
  arXiv  Detail & Related papers  (2021-03-30T18:02:55Z)
• 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)
• Sending or not sending twin-field quantum key distribution with distinguishable decoy states [10.66830089114367]
  We find the external modulation of different intensity states through the test, required in those TF-QKD with post-phase compensation, shows a side channel in frequency domain. We propose a complete and undetected eavesdropping attack, named passive frequency shift attack, on sending or not-sending TF-QKD protocol. Our results emphasize the importance of practical security at source and might provide a valuable reference for the practical implementation of TF-QKD.
  arXiv  Detail & Related papers  (2021-01-27T09:37:41Z)
• Tight security bounds for decoy-state quantum key distribution [1.1563829079760959]
  The BB84 quantum key distribution (QKD) combined with decoy-state method is currently the most practical protocol. Here, we provide the rigorous and optimal analytic formula to solve the above tasks. Our results can be widely applied to deal with statistical fluctuation in quantum cryptography protocols.
  arXiv  Detail & Related papers  (2020-02-16T07:48:25Z)

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.