Optimizing state-discrimination receivers for continuous-variable quantum key distribution over a wiretap channel

• URL: http://arxiv.org/abs/2306.11493v2
• Date: Sun, 8 Oct 2023 15:26:52 GMT
• Title: Optimizing state-discrimination receivers for continuous-variable quantum key distribution over a wiretap channel
• Authors: Michele N. Notarnicola, Marcin Jarzyna, Stefano Olivares and Konrad Banaszek
• Abstract summary: We address a continuous-variable quantum key distribution protocol employing quaternary phase-shift-keying (QPSK) of coherent states. We consider a pure-loss quantum wiretap channel, in which a possible eavesdropper is limited to collect the sole channel losses.
• Score: 1.3108652488669736
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We address a continuous-variable quantum key distribution (CV-QKD) protocol employing quaternary phase-shift-keying (QPSK) of coherent states and a non-Gaussian measurement inspired by quantum receivers minimizing the error probability in a quantum-state-discrimination scenario. We consider a pure-loss quantum wiretap channel, in which a possible eavesdropper is limited to collect the sole channel losses. We perform a characterization of state-discrimination receivers and design an optimized receiver maximizing the asymptotic secure key rate (SKR), namely the key-rate optimized receiver (KOR), comparing its performance with respect to the pretty good measurement (PGM) and the heterodyne-based protocol. We show that the KOR increases the SKR for metropolitan-network distances. Finally, we also investigate the implementations of feasible schemes, such as the displacement feed-forward receiver, obtaining an increase in the SKR in particular regimes.

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