# One-sided Measurement-Device-Independent Quantum Key Distribution

## TL;DR

This paper introduces a one-sided measurement-device-independent quantum key distribution protocol that enhances security by reducing assumptions on state preparation and is feasible with practical coherent light sources.

## Contribution

It proposes a novel 1SMDI-QKD protocol that weakens the state preparation assumption and provides a practical implementation scheme using coherent light and decoy states.

## Key findings

- Protocol offers detection loophole-free security advantage.
- Simulation shows promising performance with realistic parameters.
- Applicable to practical quantum key distribution systems.

## Abstract

Measurement-device-independent quantum key distribution (MDI-QKD) protocol was proposed to remove all the detector side channel attacks, while its security relies on the trusted encoding systems. Here we propose a one-sided MDI-QKD (1SMDI-QKD) protocol, which enjoys detection loophole-free advantage, and at the same time weakens the state preparation assumption in MDI-QKD. The 1SMDI-QKD can be regarded as a modified MDI-QKD, in which Bob's encoding system is trusted, while Alice's is uncharacterized. For the practical implementation, we also provide a scheme by utilizing coherent light source with an analytical two decoy state estimation method. Simulation with realistic experimental parameters shows that the protocol has a promising performance, and thus can be applied to practical QKD applications.