Experimental quantum randomness enhanced by a quantum network

TL;DR

This paper demonstrates that using hybrid quantum networks with channels and entanglement sources improves the robustness and noise resilience of certifiable quantum randomness, even from Bell-local states, through theoretical and experimental methods.

Contribution

It introduces a novel approach extending bipartite Bell scenarios to hybrid networks, enhancing randomness certification and noise robustness, validated experimentally in photonic systems.

Findings

Enhanced randomness certification from Bell-local states.

Improved noise resilience in quantum randomness generation.

Experimental validation in a photonic network.

Abstract

The certification of randomness is essential for both fundamental science and information technologies. Unlike traditional random number generators, randomness obtained from nonlocal correlations is fundamentally guaranteed to be unpredictable. However, it is also highly susceptible to noise. Here, we show that extending the conventional bipartite Bell scenario to hybrid quantum networks -- which incorporate both quantum channels and entanglement sources -- enhances the robustness of certifiable randomness. Our protocol even enables randomness to be certified from Bell-local states, broadening the range of quantum states useful for this task. Through both theoretical analysis and experimental validation in a photonic network, we demonstrate enhanced performance and improved noise resilience.