# Quantum random number generation by coherent detection of phase noise

## TL;DR

This paper presents a quantum random number generator that uses phase noise from two independent lasers, measured with telecom equipment, to produce intrinsically uniform random bits without the need for post-processing.

## Contribution

It introduces a robust quantum random number generation method based on phase difference measurement using standard telecom equipment, enabling high-speed and intrinsic uniformity.

## Key findings

- Generates random bits at a speed determined by laser linewidth and detector bandwidth
- Produces a probability distribution of quantum origin that is inherently uniform
- Uses readily available telecom equipment for phase measurement

## Abstract

We demonstrate a quantum random number generator based on the random nature of the phase difference between two independent laser sources. The speed of random bit generation is determined by the photodetector bandwidth and the linewidth of the lasers used. The system implemented is robust and generates a probability distribution of quantum origin which is intrinsically uniform and thus in principle needs no randomness extraction. The phase is measured with telecom equipment routinely used for high capacity coherent optical communications, which allows to keep track of the phase drift of the lasers and is readily available in the telecommunication industry.