Quantum randomness generation via orbital angular momentum modes crosstalk in a ring-core fiber

TL;DR

This paper introduces a quantum random number generator leveraging the intrinsic randomness from orbital angular momentum mode crosstalk in a ring-core fiber, achieving over 10 Mbit/s, and explores both trusted and semi-device-independent protocols.

Contribution

It presents the first experimental realization of a quantum RNG based on orbital angular momentum crosstalk and proposes a new integrated silicon photonic chip for semi-device-independent implementation.

Findings

Achieved over 10 Mbit/s random number generation rate.

Demonstrated device-dependent and semi-device-independent protocols.

Proposed a novel integrated photonic chip for quantum randomness generation.

Abstract

Genuine random numbers can be produced beyond a shadow of doubt through the intrinsic randomness provided by quantum mechanics theory. While many degrees of freedom have been investigated for randomness generation, not adequate attention has been paid to the orbital angular momentum of light. In this work, we present a quantum random number generator based on the intrinsic randomness inherited from the superposition of orbital angular momentum modes caused by the crosstalk inside a ring-core fiber. We studied two possible cases: a first one, device-dependent, where the system is trusted, and a second one, semi-device-independent, where the adversary can control the measurements. We experimentally realized the former, extracted randomness, and, after privacy amplification, we achieved a generation rate higher than 10 Mbit/s. In addition, we presented a possible realization of the semi-device-independent protocol, using a newly introduced integrated silicon photonic chip. Our work can be considered as a starting point for novel investigations of quantum random number generators based on the orbital angular momentum of light.