Time-evolving entanglement and violation of Bell inequalities using a quantum dot photon-pair emitter.

Abstract

Polarization-entangled photons provide intriguing insight into the fundamentals of quantum physics, and are vital technology for large scale quantum computing with linear optics [1], and extending the distance over which a quantum key can be shared [2]. However, those entangled photon sources that have been implemented so far are typically probed using time-averaged measurements, thus obscuring any quantum correlations that evolve over the lifetime of the state.