Intensity correlations in decoy-state BB84 quantum key distribution systems

• URL: http://arxiv.org/abs/2411.00709v1
• Date: Fri, 01 Nov 2024 16:18:39 GMT
• Title: Intensity correlations in decoy-state BB84 quantum key distribution systems
• Authors: Daniil Trefilov, Xoel Sixto, Víctor Zapatero, Anqi Huang, Marcos Curty, Vadim Makarov,
• Abstract summary: We show that higher-order correlations on the intensity of the generated signals can be much higher than that of nearest-neighbour correlations. We experimentally confirm that the impact of higher-order correlations on the intensity of the generated signals can be much higher than that of nearest-neighbour correlations.
• Score: 0.0
• License:
• Abstract: The decoy-state method is a prominent approach to enhance the performance of quantum key distribution (QKD) systems that operate with weak coherent laser sources. Due to the limited transmissivity of single photons in optical fiber, current experimental decoy-state QKD setups increase their secret key rate by raising the repetition rate of the transmitter. However, this usually leads to correlations between subsequent optical pulses. This phenomenon leaks information about the encoding settings, including the intensities of the generated signals, which invalidates a basic premise of decoy-state QKD. Here we characterize intensity correlations between the emitted optical pulses in two industrial prototypes of decoy-state BB84 QKD systems and show that they significantly reduce the asymptotic key rate. In contrast to what has been conjectured, we experimentally confirm that the impact of higher-order correlations on the intensity of the generated signals can be much higher than that of nearest-neighbour correlations.

Related papers

• Characterization of Intensity Correlation via Single-photon Detection in Quantum Key Distribution [10.02327858833847]
  One of the most significant vulnerabilities in the source unit of quantum key distribution (QKD) is the correlation between quantum states after modulation. We propose a methodology to characterize the intensity correlation according to the single-photon detection results in the measurement unit.
  arXiv  Detail & Related papers  (2024-08-15T06:13:20Z)
• A Sampling Theory Perspective on Activations for Implicit Neural Representations [73.6637608397055]
  Implicit Neural Representations (INRs) have gained popularity for encoding signals as compact, differentiable entities. We conduct a comprehensive analysis of these activations from a sampling theory perspective. Our investigation reveals that sinc activations, previously unused in conjunction with INRs, are theoretically optimal for signal encoding.
  arXiv  Detail & Related papers  (2024-02-08T05:52:45Z)
• Hyper-entanglement between pulse modes and frequency bins [101.18253437732933]
  Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols. We demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins.
  arXiv  Detail & Related papers  (2023-04-24T15:43:08Z)
• Simplified intensity- and phase-modulated transmitter for modulator-free decoy-state quantum key distribution [0.0]
  Quantum key distribution (QKD) allows secret key exchange between two users with unconditional security. Currently, the majority of QKD systems demonstrated rely on bulk intensity and phase modulators to generate optical pulses. We present and experimentally demonstrate a novel optical transmitter design to overcome this disadvantage by generating intensity- and phase-tunable pulses at GHz clock speeds.
  arXiv  Detail & Related papers  (2023-04-02T16:44:25Z)
• Phase Randomness in a Semiconductor Laser: the Issue of Quantum Random Number Generation [83.48996461770017]
  This paper describes theoretical and experimental methods for estimating the degree of phase randomization in a gain-switched laser. We show that the interference signal remains quantum in nature even in the presence of classical phase drift in the interferometer.
  arXiv  Detail & Related papers  (2022-09-20T14:07:39Z)
• Security of decoy-state quantum key distribution with correlated intensity fluctuations [0.0]
  Current decoy-state QKD setups operate at GHz repetition rates. memory effects in the modulators and electronics that control them create correlations between the intensities of the emitted pulses. This translates into information leakage about the selected intensities.
  arXiv  Detail & Related papers  (2022-06-14T09:05:41Z)
• Efficient room-temperature molecular single-photon sources for quantum key distribution [51.56795970800138]
  Quantum Key Distribution (QKD) allows the distribution of cryptographic keys between multiple users in an information-theoretic secure way. We introduce and demonstrate a proof-of-concept QKD system exploiting a molecule-based single-photon source operating at room temperature and emitting at 785nm.
  arXiv  Detail & Related papers  (2022-02-25T11:52:10Z)
• Go-and-return phase encoded SR QKD and its security consideration [0.0]
  We study the security of coherent-state quantum key distribution with a strong reference pulse. We propose a two-pass quantum key distribution phase encoding optical scheme with a strong reference pulse.
  arXiv  Detail & Related papers  (2021-06-18T12:09:34Z)
• Security of quantum key distribution with intensity correlations [0.0]
  In high-speed decoy-state QKD systems, intensity correlations between succeeding pulses leak information about the users' intensity settings. Here, we develop a technique to incorporate arbitrary intensity correlations to the security analysis of decoy-state QKD.
  arXiv  Detail & Related papers  (2021-05-24T09:13:03Z)
• Mid-infrared homodyne balanced detector for quantum light characterization [52.77024349608834]
  We present the characterization of a novel balanced homodyne detector operating in the mid-infrared. We discuss the experimental results with a view to possible applications to quantum technologies, such as free-space quantum communication.
  arXiv  Detail & Related papers  (2021-03-16T11:08:50Z)
• 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)

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.