Counter-propagating entangled photons from a waveguide with periodic nonlinearity

Details Counter-propagating entangled photons from a waveguide with periodic nonlinearity Counter-propagating entangled photons from a waveguide with periodic nonlinearity

2002-01-31

arxiv.org/abs/quant-ph/0201150v1

Phys. Rev. A 66, 023815 (2002)

Physics

Quantum Physics

submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.66.023815

The conditions required for spontaneous parametric down-conversion in a waveguide with periodic nonlinearity in the presence of an unguided pump field are established. Control of the periodic nonlinearity and the physical properties of the waveguide permits the quasi-phase matching equations that describe counter-propagating guided signal and idler beams to be satisfied. We compare the tuning curves and spectral properties of such counter-propagating beams to those for co-propagating beams under typical experimental conditions. We find that the counter-propagating beams exhibit narrow bandwidth permitting the generation of quantum states that possess discrete-frequency entanglement. Such states may be useful for experiments in quantum optics and technologies that benefit from frequency entanglement.

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