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

Abstract : 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.
Document type :
Journal articles
Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-02163714
Contributor : Eleni Diamanti <>
Submitted on : Monday, June 24, 2019 - 3:09:33 PM
Last modification on : Friday, July 5, 2019 - 3:26:03 PM

Links full text

Identifiers

Citation

Shouvik Ghorai, Philippe Grangier, Eleni Diamanti, Anthony Leverrier. Asymptotic security of continuous-variable quantum key distribution with a discrete modulation. Physical Review X, American Physical Society, 2019, 9 (2), pp.021059. ⟨10.1103/PhysRevX.9.021059⟩. ⟨hal-02163714⟩

Share

Metrics

Record views

52