Bias-free source-independent quantum random number generator

TL;DR

This paper proposes a bias-free, source-independent quantum random number generator based on vacuum fluctuation measurement, achieving high-speed generation and strong noise rejection, with potential for chip integration.

Contribution

It introduces a novel scheme eliminating bias and noise in quantum random number generation, with optimal parameters and experimental validation at 4.2 Gbps.

Findings

Supports 4.2 Gbps random number generation

Achieves 61.17 dB common mode rejection ratio

Enables all-optical, chip-compatible implementation

Abstract

A bias-free source-independent quantum random number generator scheme based on the measurement of vacuum fluctuation is proposed to realize the effective elimination of system bias and common mode noise introduced by the local oscillator. Optimal parameter settings are derived to avoid the system recording two canonically conjugate quadratures simultaneously in each measurement. In particular, it provides a new approach to investigate the performance difference between measuring two quadratures of equal and unequal intensity. It is experimentally demonstrated that the system supports 4.2 Gbps bias-free source-independent random number generation, where its common mode rejection ratio reaches 61.17 dB. Furthermore, the scheme offers an all-optical method facilitating the integration of source-independent quantum random number generators into compact chips.