Heralded generation of ultrafast single photons in pure quantum States

Heralded generation of ultrafast single photons in pure quantum States

We present an experimental demonstration of heralded single photons prepared in pure quantum states from a parametric down-conversion source. It is shown that, through controlling the modal structure of the photon pair emission, one can generate pairs in factorable states and thence eliminate the ne...

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Veröffentlicht in:Physical review letters 2008-04, Vol.100 (13), p.133601-133601, Article 133601
Hauptverfasser: Mosley, Peter J, Lundeen, Jeff S, Smith, Brian J, Wasylczyk, Piotr, U'Ren, Alfred B, Silberhorn, Christine, Walmsley, Ian A
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container_end_page 133601
container_issue 13
container_start_page 133601
container_title Physical review letters
container_volume 100
creator Mosley, Peter J
Lundeen, Jeff S
Smith, Brian J
Wasylczyk, Piotr
U'Ren, Alfred B
Silberhorn, Christine
Walmsley, Ian A
description We present an experimental demonstration of heralded single photons prepared in pure quantum states from a parametric down-conversion source. It is shown that, through controlling the modal structure of the photon pair emission, one can generate pairs in factorable states and thence eliminate the need for spectral filters in multiple-source interference schemes. Indistinguishable heralded photons were generated in two independent spectrally engineered sources and Hong-Ou-Mandel interference observed between them without spectral filters. The measured visibility of 94.4% sets a minimum bound on the mean photon purity.
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