Abstract

A big challenge in the realization of indistinguishable single photon sources from solid-state quantum emitters (such as quantum dots or color centers in diamond) is to overcome their intrinsic decoherence. Indeed their degree of indistinguishability is limited by the ratio T2/2T1, where T1 is the decay time and T2 the dephasing time constant. By placing the quantum system in an optical cavity, Purcell enhancement of radiative emission can be achieved and allows overcoming this limitation by lowering the effective T1. However, for room-temperature quantum systems where dephasing times are typically several orders of magnitude shorter than decay times, this is not sufficient to restore photon indistinguishability.

© 2015 IEEE