Efficient Long-distance Quantum Communication Using Microtoroidal Resonators

TL;DR

This paper proposes a microtoroidal resonator-based scheme for long-distance quantum communication that significantly reduces entanglement distribution time while maintaining high fidelity, outperforming previous protocols by several orders of magnitude.

Contribution

It introduces a novel scheme utilizing microtoroidal resonators for efficient long-distance quantum entanglement generation and swapping with high success probability and reduced time.

Findings

Achieves near 0.5 success probability for entanglement generation.

Reduces entanglement distribution time over 2500 km to about 30 ms.

Outperforms the DLCZ protocol by 7 orders of magnitude.

Abstract

Based on the interaction between a three-level system and a microtoroidal resonator, we present a scheme for long-distance quantum communication in which entanglement generation with near 0.5 success probability and swaps can be implemented by accurate state detection via measuring about 100 photons. With this scheme the average time of successful entanglement distribution over 2500 km with high fidelity can be decreased to only about 30 ms, by 7 orders of magnitude smaller compared with famous Duan-Lukin-Cirac-Zoller (DLCZ) protocol [L.-M. Duan {\it et al.} Nature (London) {\bf414}, 413 (2001)].