Stevenson, R. Mark and Hudson, Andrew J. and Bennett, Anthony J. and Young, Robert J. and Nicoll, Christine A. and Ritchie, David A. and Shields, Andrew J. (2008) Evolution of Entanglement Between Distinguishable Light States. Physical review letters, 101 (17). -. ISSN 0031-9007
Full text not available from this repository.Abstract
We investigate the evolution of quantum correlations over the lifetime of a multiphoton state. Measurements reveal time-dependent oscillations of the entanglement fidelity for photon pairs created by a single semiconductor quantum dot. The oscillations are attributed to the phase acquired in the intermediate, nondegenerate, exciton-photon state and are consistent with simulations. We conclude that emission of photon pairs by a typical quantum dot with finite polarization splitting is in fact entangled in a time-evolving state, and not classically correlated as previously regarded.