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Probabilistic shaped 128-APSK CV-QKD transmission system over optical fibres

Pereira, D. ; Almeida, M. ; Facão, M. ; Pinto, A. N. ; Silva, N. A.

Optics Letters Vol. 47, Nº 15, pp. 3948 - 3948, July, 2022.

ISSN (print): 0146-9592
ISSN (online): 1539-4794

Scimago Journal Ranking: 1,18 (in 2022)

Digital Object Identifier: 10.1364/OL.456333

In this Letter we present a discrete modulated, continuous variables quantum key distribution implementation using two probabilistically shaped, 128-symbol, amplitude and phase shift keying constellations. At Bob’s detection side, a polarization diverse, true heterodyne receiver architecture is implemented for symbol recovery. We demonstrate experimentally that our system is capable of achieving security against collective attacks, while using accessible, telecom-grade material, and of functioning for an indefinitely long period of time at distances in excess of 185 km, in the asymptotic regime.