Bell-inequality violation with a triggered photon-pair source

TL;DR

This paper demonstrates Bell's inequality violation using a triggered quantum dot photon-pair source without post-selection, achieving high fidelity and confirming its potential for quantum communication.

Contribution

It is the first to show Bell inequality violation with a triggered quantum dot source without post-selection, and improves fidelity through temporal gating.

Findings

Bell inequality violation demonstrated without post-selection.

Fidelity to Bell state exceeds 90% with temporal gating.

Quantum dot source suitable for quantum communication.

Abstract

Here we demonstrate, for the first time, violation of Bell's inequality using a triggered quantum dot photon-pair source without post-selection. Furthermore, the fidelity to the expected Bell state can be increased above 90% using temporal gating to reject photons emitted at times when collection of uncorrelated light is more probable. A direct measurement of a CHSH Bell inequality is made showing a clear violation, highlighting that a quantum dot entangled photon source is suitable for communication exploiting non-local quantum correlations.