Continuous-variable quantum-key-distribution protocols with a non-Gaussian modulation

Anthony Leverrier (1, 2) , Philippe Grangier (2)

1 LTCI - Laboratoire Traitement et Communication de l'Information
2 Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique

In this paper, we consider continuous-variable quantum-key-distribution (QKD) protocols which use non-Gaussian modulations. These specific modulation schemes are compatible with very efficient error-correction procedures, hence allowing the protocols to outperform previous protocols in terms of achievable range. In their simplest implementation, these protocols are secure for any linear quantum channels (hence against Gaussian attacks). We also show how the use of decoy states makes the protocols secure against arbitrary collective attacks, which implies their unconditional security in the asymptotic limit.

Domains: Quantum Physics [quant-ph]

Anthony Leverrier, Philippe Grangier. Continuous-variable quantum-key-distribution protocols with a non-Gaussian modulation. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2011, 83 (4), pp.042312. ⟨10.1103/PhysRevA.83.042312⟩. ⟨hal-00624775⟩