Physics – Quantum Physics
Scientific paper
2009-04-19
Physical Review A 79, 053842 (2009)
Physics
Quantum Physics
10 pages, 9 figures, journal paper
Scientific paper
10.1103/PhysRevA.79.053842
We examine the modal, spectral, and polarization entanglement properties of photon pairs generated in a nonlinear, periodically poled, two-mode waveguide (1-D planar or 2-D circular) via nondegenerate spontaneous parametric down-conversion. Any of the possible degrees of freedom -- mode number, frequency, or polarization -- can be used to distinguish the down-converted photons while the others serve as attributes of entanglement. Distinguishing the down-converted photons based on their mode numbers enables us to efficiently generate spectral or polarization entanglement that is either narrowband or broadband. On the other hand, when the generated photons are distinguished by their frequencies in a Type-0 process, modal entanglement turns out to be an efficient alternative to polarization entanglement. Moreover, modal entanglement in Type-II down-conversion may be used to generate a doubly entangled state in frequency and polarization.
Saleh Bahaa E. A.
Saleh Mohammed F.
Teich Malvin Carl
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