Quantum Clock Synchronization: Achieving Optimal Accuracy with Minimal Communication

Title: Quantum Clock Synchronization: Achieving Optimal Accuracy with Minimal Communication

Research Question: How can we improve upon existing quantum clock synchronization protocols to achieve optimal accuracy with minimal communication?

Methodology: The researchers proposed a new quantum protocol that improves upon previous algorithms. They used a computational model where the two parties can exchange photons back and forth, allowing them to measure the time difference between the two clocks based on a phase change in the state of the qubit. They implemented this model using a ticking qubit handshake protocol (TQH) described in I. Chuang's paper.

Results: They presented an algorithm that allows for calculating the time difference tonbits of accuracy while communicating only one qubit in one direction and using an O(2n) range of frequencies. They also proved a quantum lower bound of Ω(2n) for the product of the frequency range and the number of transmitted qubits, showing that their algorithm is optimal in this model.

Implications: This new protocol significantly improves upon previous quantum clock synchronization algorithms. It achieves optimal accuracy with minimal communication, which is crucial for practical applications. The lower bound proof also establishes the optimality of their algorithm under the given computational model.

Link to Article: https://arxiv.org/abs/0103021v1 Authors: arXiv ID: 0103021v1