A novel single-crystal & single-pass source for polarisation- and colour-entangled photon pairs

We demonstrate a new generation mechanism for polarisation- and colour-entangled photon pairs. In our approach we tailor the phase-matching of a periodically poled KTP crystal such that two downconversion processes take place simultaneously. Relying on this effect, our source emits entangled biparti...

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Bibliographic Details
Published in:Scientific reports 2017-08, Vol.7 (1), p.7235-9, Article 7235
Main Authors: Laudenbach, Fabian, Kalista, Sebastian, Hentschel, Michael, Walther, Philip, Hübel, Hannes
Format: Article
Language:English
Subjects:
639/624
639/766/400/482
639/766/483/1139
639/766/483/3925
639/766/483/481
Humanities and Social Sciences
multidisciplinary
Polarization
Quantum theory
Science
Science (multidisciplinary)
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Summary:We demonstrate a new generation mechanism for polarisation- and colour-entangled photon pairs. In our approach we tailor the phase-matching of a periodically poled KTP crystal such that two downconversion processes take place simultaneously. Relying on this effect, our source emits entangled bipartite photon states, emerging intrinsically from a single, unidirectionally pumped crystal with uniform poling period. Its property of being maximally compact and luminous at the same time makes our source unique compared to existing photon-entanglement sources and is therefore of high practical significance in quantum information experiments.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-07781-w