Demonstration of EPR steering using single-photon path entanglement and displacement-based detection

TL;DR

This paper demonstrates the violation of an EPR steering inequality using single-photon path entanglement and displacement-based detection, showcasing a loophole-free, one-sided device-independent quantum entanglement experiment.

Contribution

It presents the first loophole-free demonstration of EPR steering with single-photon path entanglement and displacement-based detection methods.

Findings

Loophole-free violation of EPR steering inequality achieved.

High-efficiency detection enabled conclusive single-photon entanglement demonstration.

Paves the way for device-independent quantum technologies using path entanglement.

Abstract

We demonstrate the violation of an EPR steering inequality developed for single photon path entanglement with displacement-based detection. We use a high-rate source of heralded single-photon path-entangled states, combined with high-efficiency superconducting-based detectors, in a scheme that is free of any post-selection and thus immune to the detection loophole. This result conclusively demonstrates single-photon entanglement in a one-sided device-independent scenario, and opens the way towards implementations of device-independent quantum technologies within the paradigm of path entanglement.