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Quantum key distribution (QKD) facilitates the distribution ofinformation-theoretic secure encryption keys by utilizing the fundamental lawsof physics. However, the security of QKD systems in practice can be undermineddue to implementation flaws, also known as side channels.Measurement-device-independent (MDI) QKD offers a solution to these type ofattacks by eliminating the vulnerability of the detector. Among differentflavors of MDI-QKD, continuous variable (CV) MDI-QKD based on coherent statesis a promising candidate for integration into existing telecom infrastructure.Despite previous demonstrations of the concept and the potential for securecommunication offered by CV MDI-QKD, a practical implementation of the systemfor real-world data encryption has yet to be achieved. Here, we introduce asimple and practical CV MDI-QKD system design that can coexist with classicaltelecommunications channels. This is achieved through the use of a new relaystructure, a real-time frequency and phase locking system and a well-designeddigital signal-processing pipeline. Our design demonstrates the first practicalCV MDI-QKD system, operating at a symbol rate of 20 MBaud and generating keysthat are secure against collective attacks in both the finite-size andasymptotic regimes. This sets an important milestone towards in-fieldimplementation and integration of high-performance CV MDI-QKD into telecomnetworks.

Real-world data encryption with continuous-variable measurement device-independent quantum key distribution