Optimized Multi-Party Quantum Clock Synchronization

TL;DR

This paper introduces an optimized multi-party quantum clock synchronization protocol that leverages Zen-states, a generalization of W-states, to improve accuracy beyond previous limits, especially when half of the parties' qubits are in the |1> state.

Contribution

It demonstrates that using Zen-states instead of W-states enhances synchronization accuracy in multi-party quantum systems.

Findings

Zen-states improve clock synchronization accuracy.

Maximum accuracy occurs when half of the qubits are in |1> state.

The protocol surpasses previous accuracy limits for W-states.

Abstract

A multi-party protocol for distributed quantum clock synchronization has been claimed to provide universal limits on the clock accuracy, viz. that accuracy monotonically decreases with the number n of party members. But, this is only true for synchronization when one limits oneself to W-states. This work shows that usage of Zen-states, a generalization of W-states, results in improved accuracy, having a maximum when \lfloor n/2 \rfloor of its members have their qubits with a |1> value.