Phys. Rev. B 78, 195410 (2008) [8 pages]Entangled photon sources based on semiconductor quantum dots: The role of pure dephasingReceived 14 January 2008; revised 8 September 2008; published 11 November 2008 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 fine-structure splitting, one must either energetically align the two exciton states by means of external fields or erase the which-path information by postselection or time reordering of photons. Here we show that in the latter schemes the photon state becomes deteriorated through dephasing processes in the solid, and the degree of entanglement remains low. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.195410
DOI:
10.1103/PhysRevB.78.195410
PACS:
73.21.La, 03.67.Mn, 71.35.−y
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