TY - JOUR
T1 - Tailoring the spatiotemporal structure of biphoton entanglement in type-I parametric down-conversion
AU - Caspani, L.
AU - Brambilla, E.
AU - Gatti, A.
PY - 2010/3/8
Y1 - 2010/3/8
N2 - 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.
AB - 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.
KW - spatio-temporal structures
KW - biphoton
KW - parametric down-conversion
KW - nonlinear crystal
KW - spatiotemporal analysis
KW - spatiotemporal correlation
UR - http://www.scopus.com/inward/record.url?scp=77950447623&partnerID=8YFLogxK
UR - http://journals.aps.org/pra/
U2 - 10.1103/PhysRevA.81.033808
DO - 10.1103/PhysRevA.81.033808
M3 - Article
AN - SCOPUS:77950447623
SN - 1050-2947
VL - 81
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 3
M1 - 033808
ER -