Auxiliary Entanglement in Photon Pairs for Multi-Photon Entanglement

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Journal of Modern Optics

DOI:https://doi.org/10.1080/09500340.2012.705342· OSTI ID:1057934

Grice, Warren P ^[1]; Bennink, Ryan S ^[1]; Evans, Philip G ^[1]; Humble, Travis S ^[1]; Schaake, Jason ^[1]

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1. ORNL

A growing number of experiments make use of multiple pairs of photons generated in the process of spontaneous parametric down-conversion. We show that entanglement in unwanted degrees of freedom can adversely affect the results of these experiments. We also discuss techniques to reduce or eliminate spectral and spatial entanglement, and we present results from two-photon polarization-entangled source with almost no entanglement in these degrees of freedom. Finally, we present two methods for the generation of four-photon polarization- entangled states. In one of these methods, four-photon can be generated without the need for intermediate two-photon entanglement.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: ORNL LDRD Director's R&D; ORNL work for others
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1057934
• Journal Information: Journal of Modern Optics, Journal Name: Journal of Modern Optics Journal Issue: 17 Vol. 59; ISSN 0950-0340
• Country of Publication: United States
• Language: English