Robust quantum cryptography with a heralded single-photon source based on the decoy-state method

TL;DR

This paper presents a robust quantum cryptography scheme utilizing a heralded single-photon source and decoy-state method, demonstrating advantages in secure key rate and transmission distance through simulations and experiments.

Contribution

The paper introduces a practical quantum cryptography scheme based on heralded single-photon sources and decoy states, validated by both simulations and experiments, showing improved performance over existing methods.

Findings

Numerical simulations show increased secure key rate and distance.

Experimental results support simulation conclusions.

Scheme remains promising despite current system limitations.

Abstract

In this paper, we describe a robust quantum cryptography scheme with a heralded single photon source based on the decoy-state method, which has been shown by numerical simulations to be advantageous compared with many other practical schemes not only with respect to the secure key generation rate but also to secure transmission distance. We have experimentally tested this scheme, and the results support the conclusions from numerical simulations well. Although there still exist many deficiencies in our present systems, it's still sufficient to demonstrate the advantages of the scheme. Besides, even when cost and technological feasibility are taken into account, our scheme is still quite promising in the implementation of tomorrow's quantum cryptography.