Tailoring the spatiotemporal structure of biphoton entanglement in type-I parametric down-conversion

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.033808· OSTI ID:21408492

Caspani, L; Brambilla, E; Gatti, A ^[1]

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1. CNR-CNISM, Dipartimento di Fisica e Matematica, Universita dell'Insubria, via Valleggio 11, I-22100 Como (Italy)

We investigate the spatiotemporal structure of the biphoton entangled state produced by parametric down-conversion (PDC) at the output face of the nonlinear crystal. We analyze the geometry of biphoton correlation for different gain regimes (from ultralow to high), different crystal lengths, and different tuning angles of the crystal. While for collinear or quasicollinear phase matching a X-shaped geometry, nonfactorizable in space and time, dominates, in the highly noncollinear conditions we observe a remarkable transition to a factorizable geometry. We show that the geometry of spatiotemporal correlation is a consequence of the angle-frequency relationship imposed by phase matching and that the fully spatiotemporal analysis provides a key to control the spatiotemporal properties of the PDC entangled state and in particular to access a biphoton localization in time and space in the femtosecond and micrometer range, respectively.

• OSTI ID: 21408492
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFICATION
CONTROL
CONVERSION
CORRELATIONS
CRYSTALS
GAIN
GEOMETRY
MATHEMATICS
NONLINEAR PROBLEMS
QUANTUM ENTANGLEMENT
TUNING