Using quantum nonlocality for device-independent confirmation of relativistic effects

TL;DR

This paper introduces a quantum nonlocality-based method for secure, device-independent clock synchronization and extends it to observe relativistic effects, enhancing security and robustness in time measurement.

Contribution

It presents a novel protocol using quantum nonlocality for device-independent clock synchronization and relativistic effect observation, improving security against classical attacks.

Findings

Secure clock synchronization without trusting devices

Device-independent detection of relativistic time dilation

Resistance to classical signal delay attacks

Abstract

Synchronizing clocks to measure time is a fundamental process underpinning every practical communication task from GPS to parallel computation. However, as the current protocols are based on classical communication between the sender and receiver, they are prone to simple attacks that could cause a slight delay in the signal which would then cause a massive error in further operations. In this work, we first explain a simple attack that in principle can cause an arbitrary delay in the signal between sender and receiver. We then propose a way to overcome this problem by using a recently contrived idea of device-independent certification which utilises quantum nonlocality. Consequently, clocks can be synchronized in a highly secure way without trusting any devices in the setup. We then extend this proposal to observe relativistic time dilation in a device-independent manner.