Abstract

We develop an optical injection locking (OIL) based local oscillator (LO) regeneration for continuous variable quantum key distribution (CVQKD) by sending a weak polarization multiplexed pilot carrier from the transmitter. The OIL at the receiver has superior performance in terms of minimum input power and noise level at offset frequencies to the erbium-doped fiber amplifier (EDFA)-based scheme. The weak pilot carrier is recovered both in power and phase via the OIL while incurring little excess noise to the CVQKD system. The phase-locked LO enables heterodyne detection of a Gaussian modulated quantum signal with a simple data-aided phase recovery without pilot tone. The obtained parameters are compatible with a raw key rate of 0.83 Mbit/s in the asymptotic regime over a 22-km fiber transmission. The technique is expected to be used in more phase-sensitive quantum optical applications.

© 2022 Optica Publishing Group

Sub-Mbps key-rate continuous-variable quantum key distribution with local local oscillator over 100-km fiber

Yaodi Pi, Heng Wang, Yan Pan, Yun Shao, Yang Li, Jie Yang, Yichen Zhang, Wei Huang, and Bingjie Xu
Opt. Lett. 48(7) 1766-1769 (2023)

High-speed Gaussian-modulated continuous-variable quantum key distribution with a local local oscillator based on pilot-tone-assisted phase compensation

Heng Wang, Yaodi Pi, Wei Huang, Yang Li, Yun Shao, Jie Yang, Jinlu Liu, Chenlin Zhang, Yichen Zhang, and Bingjie Xu
Opt. Express 28(22) 32882-32893 (2020)

High-speed continuous-variable quantum key distribution without sending a local oscillator

Duan Huang, Peng Huang, Dakai Lin, Chao Wang, and Guihua Zeng
Opt. Lett. 40(16) 3695-3698 (2015)

Continuous variable quantum key distribution with a real local oscillator using simultaneous pilot signals

Sebastian Kleis, Max Rueckmann, and Christian G. Schaeffer
Opt. Lett. 42(8) 1588-1591 (2017)

Experimental demonstration of high-rate discrete-modulated continuous-variable quantum key distribution system

Yan Pan, Heng Wang, Yun Shao, Yaodi Pi, Yang Li, Bin Liu, Wei Huang, and Bingjie Xu
Opt. Lett. 47(13) 3307-3310 (2022)