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Article Dans Une Revue Physical Review X Année : 2019

Asymptotic security of continuous-variable quantum key distribution with a discrete modulation

Résumé

We establish a lower bound on the asymptotic secret key rate of continuous-variable quantum key distribution with a discrete modulation of coherent states. The bound is valid against collective attacks and is obtained by formulating the problem as a semidefinite program. We illustrate our general approach with the quadrature-phase-shift-keying modulation scheme and show that distances over 100 km are achievable for realistic values of noise. We also discuss the application to more complex quadrature-amplitude-modulation schemes. This result opens the way to establishing the full security of continuous-variable protocols with a discrete modulation, and thereby to the large-scale deployment of these protocols for quantum key distribution.

Dates et versions

hal-02163714 , version 1 (24-06-2019)

Identifiants

Citer

Shouvik Ghorai, Philippe Grangier, Eleni Diamanti, Anthony Leverrier. Asymptotic security of continuous-variable quantum key distribution with a discrete modulation. Physical Review X, 2019, 9 (2), pp.11. ⟨10.1103/PhysRevX.9.021059⟩. ⟨hal-02163714⟩
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