Shortcoming of spectral filtering in semiconductor-based entangled photon sources

Details Shortcoming of spectral filtering in semiconductor-based entangled photon sources Shortcoming of spectral filtering in semiconductor-based entangled photon sources

2008-06-04

arxiv.org/abs/0806.0761v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We theoretically investigate the production of polarization-entangled photons through the biexciton cascade decay in a single semiconductor quantum dot. To accomplish a high degree of entanglement, despite the exciton finestructure splitting, one must either energetically align the two exciton states by means of external fields or erase the which-path information by post-selecting photons within the correct frequency range. Here we show that in the latter scheme, as well as in related proposals, the photon state becomes deteriorated through dephasing processes in the solid, and the degree of entanglement remains low despite filtering.

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