Quantum code division multiple access based continuous-variable quantum key distribution

TL;DR

This paper introduces a quantum code division multiple access system for continuous-variable quantum key distribution, using chaotic encoding and synchronization to improve secret key rates for multiple users.

Contribution

It presents a novel q-CDMA scheme for CV-QKD that enhances secret key rates by enabling multiple users to share quantum channels efficiently.

Findings

q-CDMA significantly increases secret key rates for users

Chaotic phase shifters enable secure encoding and decoding

System outperforms single-user CV-QKD in key rate efficiency

Abstract

In this paper, we propose a quantum code division multiple access (q-CDMA) based continuous-variable quantum key distribution (CV-QKD) system. In the proposed system, the quantum states of two senders ($\text{Alice}_{1,2}$) are chaotically encoded through chaotic phase shifters and then transmitted over a quantum channel. At the receiver, the quantum states are decoded via chaos synchronization to separate the quantum states sent by the different senders and received by the two receivers ($\text{Bob}_{1,2}$) separately. We characterize the input-output relation of the quadrature between the two senders and receivers and then analyze the secret key rate (SKR) of the q-CDMA-based CV-QKD system. Our numerical results reveal that the q-CDMA approach can significantly enhance the SKR for both users when compared to the single-user case without the q-CDMA approach.