Loophole-free Bell test based on local precertification of photon's presence

TL;DR

This paper proposes a new method for loophole-free Bell tests using local precertification of photons, combining advanced photon detection and generation technologies to overcome transmission loss limitations.

Contribution

It introduces a feasible scheme integrating current technologies for local precertification to enable loophole-free Bell tests with photonic systems.

Findings

The scheme is theoretically viable based on space-time analysis.

It combines enhanced photon creation, nanowire detectors, and transition-edge sensors.

The approach addresses transmission loss issues in photonic Bell tests.

Abstract

A loophole-free violation of Bell inequalities is of fundamental importance for demonstrating quantum nonlocality and long-distance device-independent secure communication. However, transmission losses represent a fundamental limitation for photonic loophole-free Bell tests. A local precertification of the presence of the photons immediately before the local measurements may solve this problem. We show that local precertification is feasible by integrating three current technologies: (i) enhanced single-photon down-conversion to locally create a flag photon, (ii) nanowire-based superconducting single-photon detectors for a fast flag detection, and (iii) superconducting transition-edge sensors to close the detection loophole. We carry out a precise space-time analysis of the proposed scheme, showing its viability and feasibility.