Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints

Details Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints

2003-09-08

arxiv.org/abs/quant-ph/0309071v1

Physics

Quantum Physics

10 pages, 5 figures

Scientific paper

10.1103/PhysRevA.69.041801

The need for spatial and spectral filtering in the generation of polarization entanglement is eliminated by combining two coherently-driven type-II spontaneous parametric downconverters. The resulting ultrabright source emits photon pairs that are polarization entangled over the entire spatial cone and spectrum of emission. We detect a flux of $\sim$12 000 polarization-entangled pairs/s per mW of pump power at 90% quantum-interference visibility, and the source can be temperature tuned for 5 nm around frequency degeneracy. The output state is actively controlled by precisely adjusting the relative phase of the two coherent pumps.

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