Source of triggered entangled photon pairs? (Reply)

R. Mark Stevenson (), Robert J. Young, Paola Atkinson, Ken Cooper, David A. Ritchie and Andrew J. Shields
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R. Mark Stevenson: Toshiba Research Europe
Robert J. Young: Toshiba Research Europe
Paola Atkinson: Cavendish Laboratory, University of Cambridge
Ken Cooper: Cavendish Laboratory, University of Cambridge
David A. Ritchie: Cavendish Laboratory, University of Cambridge
Andrew J. Shields: Toshiba Research Europe

Nature, 2007, vol. 445, issue 7124, E5-E6

Abstract: Abstract We have reported triggered photon-pair emission from single quantum dots that is suggestive of polarization entanglement1. Gilchrist et al. 2 criticize our analysis of the density matrix, claiming that the entanglement test is inappropriate. However, we show here that this analysis is in fact valid for an unpolarized source such as ours, and that this analysis (as well as alternative measures of entanglement) suggests that quantum-dot sources do emit entangled photons, and that their quality is rapidly improving3.

Date: 2007
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DOI: 10.1038/nature05547

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