Finite-size security of continuous-variable quantum key distribution with digital signal processing

Takaya Matsuura, Kento Maeda, Toshihiko Sasaki and Masato Koashi ()
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Takaya Matsuura: The University of Tokyo
Kento Maeda: The University of Tokyo
Toshihiko Sasaki: The University of Tokyo
Masato Koashi: The University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract In comparison to conventional discrete-variable (DV) quantum key distribution (QKD), continuous-variable (CV) QKD with homodyne/heterodyne measurements has distinct advantages of lower-cost implementation and affinity to wavelength division multiplexing. On the other hand, its continuous nature makes it harder to accommodate to practical signal processing, which is always discretized, leading to lack of complete security proofs so far. Here we propose a tight and robust method of estimating fidelity of an optical pulse to a coherent state via heterodyne measurements. We then construct a binary phase modulated CV-QKD protocol and prove its security in the finite-key-size regime against general coherent attacks, based on proof techniques of DV QKD. Such a complete security proof is indispensable for exploiting the benefits of CV QKD.

Date: 2021
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DOI: 10.1038/s41467-020-19916-1

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