Stevenson, R. M. and Young, R. J. and Hudson, A. J. and Bennett, A. J. and Nicoll, C. A. and Ritchie, D. A. and Shields, A. J. (2009) Time-evolving entanglement and violation of bell inequalities using a quantum dot photon-pair emitter. In: The European Conference on Lasers and Electro-Optics, CLEO_Europe 2009 :. Optical Society of America (OSA), DEU. ISBN 9781424440801
Full text not available from this repository.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, and extending the distance over which a quantum key can be shared. 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. Here we measure the evolution of quantum correlations over the lifetime of a photon pair state, generated by an optically excited quantum dot at ~10K. Time-dependent oscillations of the entanglement fidelity are observed, and attributed to the spin-dependent phase acquired in the intermediate, non-degenerate, exciton-photon state.