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Gatti A, Brambilla E, Caspani L, et al. X entanglement: the nonfactorable spatiotemporal structure of biphoton correlation. Phys Rev Lett. 2009;102(22):223601doi: 10.1103/PhysRevLett.102.223601.
Gatti, A., Brambilla, E., Caspani, L., Jedrkiewicz, O., & Lugiato, L. A. (2009). X entanglement: the nonfactorable spatiotemporal structure of biphoton correlation. Physical review letters, 102(22), 223601. https://doi.org/10.1103/PhysRevLett.102.223601
Gatti, A, et al. "X entanglement: the nonfactorable spatiotemporal structure of biphoton correlation." Physical review letters vol. 102,22 (2009): 223601. doi: https://doi.org/10.1103/PhysRevLett.102.223601
Gatti A, Brambilla E, Caspani L, Jedrkiewicz O, Lugiato LA. X entanglement: the nonfactorable spatiotemporal structure of biphoton correlation. Phys Rev Lett. 2009 Jun 05;102(22):223601. doi: 10.1103/PhysRevLett.102.223601. Epub 2009 Jun 04. PMID: 19658864.
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Phys Rev Lett. 2009 Jun 05;102(22):223601. doi: 10.1103/PhysRevLett.102.223601. Epub 2009 Jun 04.

X entanglement: the nonfactorable spatiotemporal structure of biphoton correlation.

Physical review letters

A Gatti, E Brambilla, L Caspani, O Jedrkiewicz, L A Lugiato

Affiliations

  1. INFM-CNR-CNISM, Dipartimento di Fisica e Matematica, Università dell'Insubria, Via Valleggio 11, 22100 Como, Italy.

PMID: 19658864 DOI: 10.1103/PhysRevLett.102.223601

Abstract

We investigate the spatiotemporal structure of the biphoton entanglement in parametric down-conversion (PDC) and we demonstrate its nonfactorable X-shaped geometry. Such a structure gives access to the ultrabroad bandwidth of PDC, and can be exploited to achieve a biphoton temporal localization in the femtosecond range. This extreme localization is connected to our ability to resolve the photon positions in the source near field. The nonfactorability opens the possibility of tailoring the temporal entanglement by acting on the spatial degrees of freedom of twin photons.

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