Multiparty quantum secret sharing with pure entangled states and decoy photons

TL;DR

This paper proposes a practical multiparty quantum secret sharing scheme using pure entangled states and decoy photons, enhancing security and efficiency without requiring ideal sources.

Contribution

It introduces a novel scheme that does not need maximally entangled states or perfect single-photon sources, improving practicality and efficiency in quantum secret sharing.

Findings

Uses decoy photons to prevent eavesdropping

Achieves high intrinsic qubit efficiency

Requires less classical communication

Abstract

We present a scheme for multiparty quantum secret sharing of a private key with pure entangled states and decoy photons. The boss, say Alice uses the decoy photons, which are randomly in one of the four nonorthogonal single-photon states, to prevent a potentially dishonest agent from eavesdropping freely. This scheme requires the parties of communication to have neither an ideal single-photon quantum source nor a maximally entangled one, which makes this scheme more convenient than others in a practical application. Moreover, it has the advantage of having high intrinsic efficiency for qubits and exchanging less classical information in principle.