Evolution of entanglement between distinguishable light states.
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.
Stevenson
R Mark
RM
Toshiba Research Europe Limited, 208 Cambridge Science Park, Cambridge, United Kingdom.
Hudson
Andrew J
AJ
Bennett
Anthony J
AJ
Young
Robert J
RJ
Nicoll
Christine A
CA
Ritchie
David A
DA
Shields
Andrew J
AJ