Experimental passive state preparation for continuous variable quantum communications

• URL: http://arxiv.org/abs/2001.06417v2
• Date: Wed, 15 Apr 2020 15:24:08 GMT
• Title: Experimental passive state preparation for continuous variable quantum communications
• Authors: Bing Qi, Hyrum Gunther, Philip G. Evans, Brian P. Williams, Ryan M. Camacho, and Nicholas A. Peters
• Abstract summary: An equivalent passive QKD scheme was proposed by exploring the intrinsic field fluctuations of a thermal source. This passive QKD scheme is especially appealing for chip-scale implementation since no active modulations are required. We conduct an experimental study of the passively encoded QKD scheme using an off-the-shelf spontaneous emission source operated in continuous-wave mode.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In the Gaussian-modulated coherent state quantum key distribution (QKD) protocol, the sender first generates Gaussian distributed random numbers and then encodes them on weak laser pulses actively by performing amplitude and phase modulations. Recently, an equivalent passive QKD scheme was proposed by exploring the intrinsic field fluctuations of a thermal source [B. Qi, P. G. Evans, and W. P. Grice, Phys. Rev. A 97, 012317 (2018)]. This passive QKD scheme is especially appealing for chip-scale implementation since no active modulations are required. In this paper, we conduct an experimental study of the passively encoded QKD scheme using an off-the-shelf amplified spontaneous emission source operated in continuous-wave mode. Our results show that the excess noise introduced by the passive state preparation scheme can be effectively suppressed by applying optical attenuation and secure key could be generated over metro-area distances.

Related papers

• Coherent Detection of Discrete Variable Quantum Key Distribution using Homodyne Technique [0.18749305679160366]
  Homodyne detection method is frequently employed for its simplicity in use, effectiveness in terms of error correction, and suitability with contemporary optical communication systems. We present simulation results for System Efficiency and Quantum Bit Error Rate (QBER) for the proposed model.
  arXiv  Detail & Related papers  (2024-02-20T15:39:50Z)
• Finite-key security of passive quantum key distribution [0.0]
  The passive approach to quantum key distribution (QKD) consists of eliminating all optical modulators and random number generators from QKD systems. We provide finite-key security bounds for a fully passive decoy-state BB84 protocol.
  arXiv  Detail & Related papers  (2023-08-04T15:18:25Z)
• Proof-of-Principle Demonstration of Fully-Passive Quantum Key Distribution [2.4149105714758545]
  Quantum key distribution (QKD) offers information-theoretic security based on the fundamental laws of physics. Device imperfections, such as those in active modulators, may introduce side-channel leakage. Our work demonstrates the feasibility of active-modulation-free QKD in polarization-encoded systems.
  arXiv  Detail & Related papers  (2023-04-20T15:11:41Z)
• A fully passive transmitter for decoy-state quantum key distribution [3.4069627091757173]
  A passive quantum key distribution (QKD) transmitter generates the quantum states prescribed by a QKD protocol at random. By avoiding the use of active optical modulators externally driven by random number generators, passive QKD transmitters offer immunity to modulator side channels.
  arXiv  Detail & Related papers  (2022-08-26T09:17:13Z)
• Fibre polarization state compensation in entanglement-based quantum key distribution [62.997667081978825]
  Quantum Key Distribution (QKD) using polarisation encoding can be hard to implement over deployed telecom fibres. We show a technique for dynamically compensating fibre-induced alteration in a QKD system over deployed fibre.
  arXiv  Detail & Related papers  (2021-07-16T00:53:48Z)
• 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)
• Direct phase modulation via optical injection: theoretical study [50.591267188664666]
  We study the influence of the spontaneous emission noise, examine the role of the gain non-linearity and consider the effect of the temperature drift. We have tried to formulate here practical instructions, which will help to take these features into account when elaborating and employing the optical-injection-based phase modulator.
  arXiv  Detail & Related papers  (2020-11-18T13:20:04Z)
• Twin-field quantum key distribution with passive-decoy state [22.26373392802507]
  We propose passive-decoy based TF-QKD, in which we combine TF-QKD with the passive-decoy method. We present a simulation comparing the key generation rate with that in active-decoy, the result shows our scheme performs as good as active decoy TF-QKD.
  arXiv  Detail & Related papers  (2020-11-15T04:02:48Z)
• Assessment of weak-coupling approximations on a driven two-level system under dissipation [58.720142291102135]
  We study a driven qubit through the numerically exact and non-perturbative method known as the Liouville-von equation with dissipation. We propose a metric that may be used in experiments to map the regime of validity of the Lindblad equation in predicting the steady state of the driven qubit.
  arXiv  Detail & Related papers  (2020-11-11T22:45:57Z)
• Coherent detection schemes for subcarrier wave continuous variable quantum key distribution [48.87378091233822]
  We examine different methods to implement coherent detection in the subcarrier wave quantum key distribution (SCW QKD) systems. For classical wavefields, we present the models describing homodyne-type and heterodyne-type coherent detection schemes.
  arXiv  Detail & Related papers  (2020-06-30T05:46:09Z)
• Hardware-Encoding Grid States in a Non-Reciprocal Superconducting Circuit [62.997667081978825]
  We present a circuit design composed of a non-reciprocal device and Josephson junctions whose ground space is doubly degenerate and the ground states are approximate codewords of the Gottesman-Kitaev-Preskill (GKP) code. We find that the circuit is naturally protected against the common noise channels in superconducting circuits, such as charge and flux noise, implying that it can be used for passive quantum error correction.
  arXiv  Detail & Related papers  (2020-02-18T16:45:09Z)

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.