Phase self-aligned continuous-variable measurement-device-independent quantum key distribution

TL;DR

This paper introduces a novel optical scheme for continuous-variable measurement-device-independent quantum key distribution that overcomes phase-locking challenges and eliminates the need for identical lasers, enabling practical in-field implementation.

Contribution

The authors propose a new optical scheme that simplifies CV-MDI-QKD setup, facilitating real-world deployment and network construction with untrusted sources.

Findings

New optical scheme overcomes phase-locking challenges

Eliminates need for identical independent lasers

Enables in-field CV-MDI-QKD demonstration

Abstract

Continuous-variable measurement-independent-device quantum key distribution (CV-MDI-QKD) can offer high secure key rate at metropolitan distance and remove all side channel loopholes of detection as well. However, there is no complete experimental demonstration of CV-MDI-QKD due to the remote distance phase-locking techniques challenge. Here, we present a new optical scheme to overcome this difficulty and also removes the requirement of two identical independent lasers. We anticipate that our new scheme can be used to demonstrate the in-field CV-MDI-QKD experiment and build the CV-MDI-QKD network with untrusted source.