Clock synchronization using maximal multipartite entanglement

TL;DR

This paper introduces a quantum clock synchronization protocol leveraging maximal multipartite entanglement of GHZ states, enabling highly sensitive detection of time differences among multiple parties.

Contribution

It presents a novel multi-party quantum synchronization method using GHZ-type states and local transformations, optimizing the use of multipartite entanglement for precise timing.

Findings

Protocol achieves high sensitivity to time differences

Performance surpasses previous quantum synchronization methods

Efficient in terms of statistical error in time estimation

Abstract

We propose a multi party quantum clock synchronization protocol that makes optimal use of the maximal multipartite entanglement of GHZ-type states. To realize the protocol, different versions of maximally entangled eigenstates of collective energy are generated by local transformations that distinguish between different groupings of the parties. The maximal sensitivity of the entangled states to time differences between the local clocks can then be accessed if all parties share the results of their local time dependent measurements. The efficiency of the protocol is evaluated in terms of the statistical errors in the estimation of time differences and the performance of the protocol is compared to alternative protocols previously proposed.