Spatially entangled four-photon states from a periodically poled potassium-titanyl-phosphate crystal

Spatially entangled four-photon states from a periodically poled potassium-titanyl-phosphate crystal

Spatial quantum correlations are an important resource for quantum imaging and future quantum technologies based on high-dimensional entanglement. We experimentally explore spatial correlations in four-photon states generated by a highly efficient parametric down-conversion process in a 2 mm long pe...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Vol. 85; no. 4
Main Authors: van der Torren, Alexander J. H., Yorulmaz, S. Cigdem, Renema, Jelmer J., van Exter, Martin P., de Dood, Michiel J. A.
Format: Journal Article
Language:English
Published: 24-04-2012
Subjects:
Correlation
Crystals
Density
Emission
Entanglement
KTP crystals
Photons
Stimulated emission
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Summary:Spatial quantum correlations are an important resource for quantum imaging and future quantum technologies based on high-dimensional entanglement. We experimentally explore spatial correlations in four-photon states generated by a highly efficient parametric down-conversion process in a 2 mm long periodically poled KTP crystal. The four-photon states produced in the crystal contain a contribution due to independent double pairs produced via spontaneous pair emission and a highly correlated four-photon state produced by stimulated emission of a second photon pair. We separate this contribution and introduce a joint spatial density for stimulated pair emission. We observe a maximum visibility chi =0.25 of the four-photon state for a 1.5 nm bandpass filter.
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content type line 23
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.85.043837