Multi-bit quantum random number generator from path-entangled single photons

TL;DR

This paper presents a scheme for generating multi-bit quantum random numbers using path-entangled single photons, achieving high bitrates and passing standard randomness tests, with certification of quantumness.

Contribution

The work introduces a novel multi-bit QRNG scheme using path-entangled photons that surpasses previous methods in bitrate and certification capabilities.

Findings

Achieved about 80 Mbps random bit generation rate.

Passed NIST randomness tests and certified quantumness via CHSH inequality.

Generated multiple bits per photon without detector dead-time limitations.

Abstract

Measurement outcomes on quantum systems exhibit inherent randomness and are fundamentally nondeterministic. This has enabled quantum physics to set new standards for the generation of true randomness with significant applications in the fields of cryptography, statistical simulations, and modeling of the nondeterministic behavior in various other fields. In this work, we present a scheme for the generation of multi-bit random numbers using path-entangled single photons. Without losing their intrinsic randomness, the protocol allows us to engineer the distribution from which we sample random numbers. For the experimental demonstration, we use single photons generated using spontaneous parametric down-conversion (SPDC), and assign a multi-bit commitment along the path. One-bit and two-bit random numbers are then generated from measuring entangled states in the path basis. In addition to passing the NIST tests for randomness, we also demonstrate the certification of quantumness and self-certification of quantum random number generator (QRNG) using Clauser, Horne, Shimony and Holt (CHSH) inequality violation. The path-entangled states can generate higher bitrates compared to heralded single photon or entangled photon schemes which are limited by the coincidence counts. The scheme involves distribution of photons along multiple paths resulting in multiple bits from one photon and avoids the limitation imposed by the detection dead time of one detector. We demonstrate this by generating a high rate of about 80 Mbps when the single photon detector saturates at around 28 Mcps.