Abstract
Entangled photon pairs are key ingredient to implement a quantum information processing. The usual method to generate entangled photon pairs is parametric down-conversion. Recently, entangled photon generations have been succeeded in a semiconductor such as resonant hyper-parametric scattering (RHPS) via biexciton in a bulk CuCl and biexciton decay cascade in an InAs/GaAs single quantum dot (QD). In particular, QDs have a potential to provide event-ready entangled photon sources. In this paper, we provide theoretical study on entangled photon generation by means of RHPS in a QD embedded in a microcavity. The emphasis lies on the photon blockade effect on efficient entangled photon generation with high degree of purity. Furthermore, we note that a biexciton plays only a minor role in entangled photon generation because of the characteristic excited states in the cavity QED. This is contrast to entangled photon generation in a semiconductor until now, in which excitation of biexciton is indispensable for the entangled photon generation.
© 2007 IEEE
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