Semi-transmitter-device-independent quantum key distribution

TL;DR

This paper introduces a semi-transmitter-device-independent quantum key distribution scheme that enhances security by integrating the entanglement source into the transmitter, demonstrated with a proof-of-principle experiment achieving 1 kbps at 20 km.

Contribution

It presents the first discrete-variable 1sDI-QKD scheme with semi-transmitter-device-independence, improving security and practicality in real-world quantum communication.

Findings

Achieved a secure key rate of 1 kbps at 20 km fiber distance.

First demonstration of discrete-variable 1sDI-QKD.

Scheme maintains strong loss tolerance while reducing transmitter dependence.

Abstract

Transmitter-device-dependence is a longstanding but often implicit problem in quantum key distribution (QKD), as compared to measurement-device-dependence. One-sided device-independent (1sDI) scenario relaxes the security conditions of DI framework and offers an intuitive solution to transmitter-sided dependence. Here we show that, by constructing a composable transmitter in a 1sDI configuration, the transmitter-device-dependence can be largely eliminated. Our scheme integrates the entanglement source into the transmitter as an individual part, and the detection module is another individual part treated as black box. In a proof-of-principle experiment we obtain a secure key-rate of 1~kbps at an equivalent transmission fiber distance of 20~km, demonstrating the first discrete-variable 1sDI-QKD. By implementing semi-transmitter-device-independent security while maintaining strong loss tolerance, our approach bridges security and practicality for real-world 1sDI-QKD deployments.