Source of triggered entangled photon pairs?

Alexei Gilchrist, Kevin J. Resch and Andrew G. White ()
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Alexei Gilchrist: University of Queensland
Kevin J. Resch: University of Queensland
Andrew G. White: University of Queensland

Nature, 2007, vol. 445, issue 7124, E4-E5

Abstract: Abstract Arising from: R. M. Stevenson et al. Nature 439, 179–182 (2006)10.1038/nature04446 ; Stevenson et al. reply The realization of an entangled photon source will be of great importance in quantum information — for example, for quantum key distribution and quantum computation — and Stevenson et al.1 have described such a source. However, we show here that first, their source is not entangled; second, they use inappropriate entanglement indicators that rely on assumptions invalidated by their data; and third, their source has insignificant entanglement even after simulating subtraction of the significant quantity of background noise. We therefore find that the standard of proof required for a semiconductor source of triggered entangled photon pairs has not been met by Stevenson et al.1.

Date: 2007
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DOI: 10.1038/nature05546

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