Fast generation of entangled photon pairs from a single quantum dot embedded in a photonic crystal cavity

Details Fast generation of entangled photon pairs from a single quantum dot embedded in a photonic crystal cavity Fast generation of entangled photon pairs from a single quantum dot embedded in a photonic crystal cavity

2009-06-16

arxiv.org/abs/0906.3035v1

Phys. Rev. B 80, 155325 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8pages 6figures

Scientific paper

We present a scheme for the fast generation of entangled photons from a single quantum dot coupled to a planar photonic crystal that support two orthogonally polarized cavity modes. We discuss ``within generation'' and ``across generation'' of entangled photons when both biexciton to exciton, and exciton to ground state transitions, are coupled through cavity modes. In the across generation, the photon entanglement is restored through a time delay between the photons. The two photon concurrence, which is a measure of entanglement, is greater than 0.7 and 0.8 using experimentally achievable parameters in across generation and within generation, respectively. We also show that the entanglement can be distilled in both cases using a simple spectral filter.

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