Continuous-variable quantum key distribution (CV-QKD) using a true local (located at the receiver) oscillator (LO) has been proposed to remove any possibility of side-channel attacks associated with transmission of the LO as well as reduce the cross-pulse contamination. Here we report an implementation of true LO CV-QKD using "off-the-shelf" components and conduct QKD experiments using the fiber optical network at Oak Ridge National Laboratory. A phase reference and quantum signal are time multiplexed and then wavelength division multiplexed with the classical communications which "coexist" with each other on a single optical network fiber. This is the first demonstration of CV-QKD with a receiver-based true LO over a deployed fiber network, a crucial step for its application in real-world situations.
@article{arxiv.2309.03959,
title = {Continuous-variable quantum key distribution field-test with true local oscillator},
author = {Brian P. Williams and Bing Qi and Muneer Alshowkan and Philip G. Evans and Nicholas A. Peters},
journal= {arXiv preprint arXiv:2309.03959},
year = {2024}
}