High-efficient long-distance device-independent quantum secret sharing based on single-photon sources

TL;DR

This paper introduces a highly efficient, long-distance device-independent quantum secret sharing protocol utilizing practical single-photon sources, significantly enhancing transmission distance and efficiency over previous entanglement-based methods.

Contribution

It proposes a novel DI QSS protocol based on single-photon sources that overcomes transmission loss issues and boosts key rates and distances compared to prior entanglement-based protocols.

Findings

Increases practical communication efficiency by six orders of magnitude.

Extends secure photon transmission distance by at least 151 times.

Feasible with current experimental technologies.

Abstract

Device-independent quantum secret sharing (DI QSS) relaxes security assumptions of experimental devices to provide the highest security level for QSS. Previous DI QSS protocols require to generate multi-partite entangled states and then implement the long-distance entanglement distribution. The extremely low generation probability of current multi-partite entanglement source and photon transmission loss largely limit DI QSS's practical key generation rate and secure photon transmission distance. In the paper, we propose a high-efficient long-distance DI QSS protocol based on practical nearly on-demand single-photon sources (SPSs), which adopts the single photons and heralded architecture to construct long-distance multi-partite entanglement channels. Our SPS DI QSS protocol can automatically eliminate the negative influence from photon transmission loss and largely increase the secure photon transmission distance. Moreover, we adopt active improvement strategies such as random key generation basis, postselection, and advanced postselection to further increase the practical key generation rate and lower the experimental requirement. Comparing with previous DI QSS protocols based on entanglement sources, our SPS DI QSS protocol can increase the practical communication efficiency by six orders of magnitude, and increase the secure photon transmission distance by at least 151 times. This SPS DI QSS protocol is feasible with the current experimental technologies. Our protocol makes it possible to realize high-efficient long-distance DI network in the near future.