Direct generation of photon triplets using cascaded photon-pair sources

Hübel, Hannes, Hamel, Deny R., Fedrizzi, Alessandro, Ramelow, Sven, Resch, Kevin J. and Jennewein, Thomas (2010) Direct generation of photon triplets using cascaded photon-pair sources. Nature, 466 7306: 601-603. doi:10.1038/nature09175

Author Hübel, Hannes
Hamel, Deny R.
Fedrizzi, Alessandro
Ramelow, Sven
Resch, Kevin J.
Jennewein, Thomas
Title Direct generation of photon triplets using cascaded photon-pair sources
Journal name Nature   Check publisher's open access policy
ISSN 0028-0836
Publication date 2010-07-29
Sub-type Article (original research)
DOI 10.1038/nature09175
Volume 466
Issue 7306
Start page 601
End page 603
Total pages 3
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2011
Language eng
Formatted abstract
Non-classical states of light, such as entangled photon pairs and number states, are essential for fundamental tests of quantum mechanics and optical quantum technologies. The most widespread technique for creating these quantum resources is spontaneous parametric down-conversion of laser light into photon pairs1. Conservation of energy and momentum in this process, known as phasematching,
gives rise to strong correlations that are used to produce two-photon entanglement in various degrees of freedom2–9. It has been a longstanding goal in quantum optics to realize a source that can produce analogous correlations in photon triplets, but of
the many approaches considered, none has been technically feasible10–17. Here we report the observation of photon triplets generated by cascaded down-conversion. Each triplet originates from a single pump photon, and therefore quantum correlations will extend over all three photons18 in a way not achievable with independently
created photon pairs19. Our photon-triplet source will allow experimental interrogation of novel quantum correlations20, the generation of tripartite entanglement12,21 without post-selection and the generation of heralded entangled photon pairs suitable for
linear optical quantum computing22. Two of the triplet photons have a wavelength matched for optimal transmission in optical fibres, suitable for three-party quantum communication23. Furthermore, our results open interesting regimes of non-linear optics, as we observe spontaneous down-conversion pumped by single photons,
an interaction also highly relevant to optical quantum computing. 
Keyword Conversion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published under heading: Letter

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Centre for Quantum Computer Technology Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 52 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 66 times in Scopus Article | Citations
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Created: Sun, 15 Aug 2010, 00:01:57 EST