TY - JOUR
T1 - Spatial distinguishability of photons produced by spontaneous parametric down-conversion with a focused pump
AU - Bennink, Ryan S.
AU - Liu, Yun
AU - Earl, D. Duncan
AU - Grice, Warren P.
PY - 2006
Y1 - 2006
N2 - It is known that photons produced by spontaneous parametric down-conversion can be coupled into optical fibers more efficiently by focusing the pump field. We find that focusing the pump in type-II down-conversion causes photons of ordinary and extraordinary polarization to acquire very different angular spreads, which amounts to spatial information that distinguishes between the polarization states. Numerical studies predict that the photons collected by a detector or quantum channel will be of predominantly one polarization and that the degree of polarization entanglement will be lessened in some cases.
AB - It is known that photons produced by spontaneous parametric down-conversion can be coupled into optical fibers more efficiently by focusing the pump field. We find that focusing the pump in type-II down-conversion causes photons of ordinary and extraordinary polarization to acquire very different angular spreads, which amounts to spatial information that distinguishes between the polarization states. Numerical studies predict that the photons collected by a detector or quantum channel will be of predominantly one polarization and that the degree of polarization entanglement will be lessened in some cases.
UR - http://www.scopus.com/inward/record.url?scp=33746855868&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.74.023802
DO - 10.1103/PhysRevA.74.023802
M3 - Article
AN - SCOPUS:33746855868
SN - 1050-2947
VL - 74
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 2
M1 - 023802
ER -