A reply to "Quantum Clock Synchronization"

TL;DR

This paper critiques a quantum clock synchronization protocol, arguing it is equivalent to classical methods and discussing potential ways to improve its utility.

Contribution

It provides a critical analysis of existing quantum clock synchronization protocols and suggests directions for future improvements.

Findings

QCS relies on identical unitary evolution, akin to classical methods.

The protocol is not inherently superior to classical synchronization.

Potential modifications could enhance quantum synchronization effectiveness.

Abstract

Recently a protocol for Quantum Clock Synchronization (QCS) of remote clocks using quantum entanglement was proposed by Jozsa et al. This method has the goal of eliminating the random noise present in classical synchronization techniques. However, as stated QCS depends on the two members of each entangled pair undergoing the same unitary evolution even while being transported to different locations. This is essentially equivalent to a perfect Eddington Slow Clock Transfer protocol and thus, not an improvement over classical techniques. We will discuss this and suggest ways in which QCS may still be used.