Delegated verification of quantum randomness with linear optics

TL;DR

This paper introduces a delegated verification protocol for quantum-generated randomness using linear optics, enabling third-party statistical testing without revealing private data, thus enhancing security in quantum cryptography.

Contribution

It presents a novel method for publicly verifying quantum randomness through a third party without compromising secrecy, implemented on optical systems.

Findings

Successfully implemented the protocol on two optical systems

Demonstrated the protocol's ability to verify randomness securely

Compared the performance of different optical implementations

Abstract

Randomness is a critical resource of modern cryptosystems. Quantum mechanics offers the best properties of an entropy source in terms of unpredictability. However, these sources are often fragile and can fail silently. Therefore, statistical tests on their outputs should be performed continuously. Testing a sequence for randomness can be very resource-intensive, especially for longer sequences, and transferring this to other systems can put the secrecy at risk. In this paper, we present a method that allows a third party to publicly perform statistical testing without compromising the confidentiality of the random bits by connecting the quality of a public sequence to the private sequence generated using a quantum process. We implemented our protocol over two different optical systems and compared them.