Bell-Inequality Violation with a Triggered Photon-Pair Source

Young, R. J. and Stevenson, R. M. and Hudson, A. J. and Nicoll, C. A. and Ritchie, D. A. and Shields, A. J. (2009) Bell-Inequality Violation with a Triggered Photon-Pair Source. Physical review letters, 102 (3): 030406. -. ISSN 0031-9007

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 is 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 nonlocal quantum correlations.