Multiparty hierarchical quantum-information splitting

TL;DR

This paper introduces a hierarchical quantum-information splitting scheme using multipartite entanglement, enabling asymmetric secret sharing among agents with different authorities, without requiring nonlocal operations, and ensuring security against eavesdropping.

Contribution

It presents a novel hierarchical QIS protocol that uses multipartite entangled states and minimal nonlocal operations, advancing secure quantum cryptography methods.

Findings

Scheme is secure against eavesdropping

Allows asymmetric authority levels in secret recovery

Operates with only local measurements and classical communication

Abstract

We propose a scheme for multiparty hierarchical quantum-information splitting (QIS) with a multipartite entangled state, where a boss distributes a secret quantum state to two grades of agents asymmetrically. The agents who belong to different grades have different authorities for recovering boss's secret. Except for boss's Bell-state measurement, no nonlocal operation is involved. The presented scheme is also shown to be secure against eavesdropping. Such a hierarchical QIS is expected to find useful applications in the field of modern multipartite quantum cryptography.