Continuous-Variable Quantum Key Distribution Scheme with Odd Coherent States

摘要

The Quantum key distribution (QKD) has been entering the practical application era. The odd co-herent state which follows sub Poisson distributed has been confirmed to extend transmission distance and improve se-cret key rate in Discrete-variable quantum key distribution (DVQKD) protocol. We propose Entanglement-based (EB) scheme of Continuous-variable quantum key distribution (CVQKD) with odd coherent state. This scheme allows distributing Gaussian modulated CVQKD with laser light which could be odd coherent state. We analyze the loga-rithmic negativity between entangled odd coherent states and the security. The results show that renewed scheme can extend secure distance by 10.6％ and enhance the tol-erance excess noise in same parameter, and the renewed scheme could be applied to prepare-and-measure (P&M) model in CVQKD.