Performance analysis of continuous-variable quantum key distribution using non-Gaussian states

Abstract

In this study, we analyze the efficiency of a protocol with discrete modulation of continuous variable non-Gaussian states, the coherent states having one photon added and then one photon subtracted (PASCS). We calculate the secure key generation rate against collective attacks using the fact that Eve's information can be bounded based on the protocol with Gaussian modulation, which in turn is unconditionally secure. Our results for a four-state protocol show that the PASCS always outperforms the equivalent coherent states protocol under the same environmental conditions. Interestingly, we find that for the protocol using discrete-modulated PASCS, the noisier the line, the better will be its performance compared to the protocol using coherent states. Thus, our proposal proves to be advantageous for performing quantum key distribution in non-ideal situations.

12 pages, 5 figures

References in corpus (6)

• Unconditional optimality of Gaussian attacks against continuous-variable QKD
• Quantum key distribution over 25 km with an all-fiber continuous-variable system
• Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
• Improving the maximum transmission distance of continuous-variable quantum key distribution using a noiseless amplifier
• Explicit asymptotic secret key rate of continuous-variable quantum key distribution with an arbitrary modulation
• Gaussian Post-selection for Continuous Variable Quantum Cryptography

Cited by in corpus (3)

• A Survey on Continuous Variable Quantum Key Distribution for Secure Data Transmission: Toward the Future of Secured Quantum-Networks
• A Novel Scalable Quantum Protocol for the Dining Cryptographers Problem
• Enabling CV-MDI-QKD for low squeezed states using non-Gaussian operations