Characterising higher-order phase correlations in gain-switched laser sources with application to quantum key distribution - INSPIRE

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Characterising higher-order phase correlations in gain-switched laser sources with application to quantum key distribution

Alessandro Marcomini
(
- Vigo U.
)
,
Guillermo Currás-Lorenzo
(
- Vigo U.
)
,
Davide Rusca
(
- Vigo U.
)
,
Angel Valle
(
- Cantabria Inst. of Phys.
)
,
Kiyoshi Tamaki
(
- Toyama U.
)

Dec 4, 2024

15 pages

Published in:

EPJ Quant.Technol. 12 (2025) 1, 38

Published: Mar 19, 2025

e-Print:

2412.03738 [quant-ph]

DOI:

10.1140/epjqt/s40507-025-00340-7

View in:

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Abstract: (Springer)

Multi-photon emissions in laser sources represent a serious threat for the security of quantum key distribution (QKD). While the decoy-state technique allows to solve this problem, it requires uniform phase randomisation of the emitted pulses. However, gain-switched lasers operating at high repetition rates do not fully satisfy this requirement, as residual photons in the laser cavity introduce correlations between the phases of consecutive pulses. Here, we introduce experimental schemes to characterise the phase probability distribution of the emitted pulses, and demonstrate that an optimisation task over interferometric measures suffices in determining the impact of arbitrary order correlations, which ultimately establishes the security level of the implementation according to recent security proofs. We expect that our findings may find usages beyond QKD as well.

Note:

15 pages, 7 figures

Quantum communications
Quantum cryptography
Quantum key distribution
Gain-switched laser
Optical phase correlations

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