Generation of different Bell states within the spontaneous parametric 
down-conversion phase-matching bandwidth

Brida, Giorgio; Chekhova, Maria; Genovese, Marco; Krivitsky, Leonid

doi:10.1103/PhysRevA.76.053807

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Generation of different Bell states within the spontaneous parametric down-conversion phase-matching bandwidth

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Citation

Brida, G., Chekhova, M., Genovese, M., & Krivitsky, L. (2007). Generation of different Bell states within the spontaneous parametric down-conversion phase-matching bandwidth. PHYSICAL REVIEW A, 76(5): 053807. doi:10.1103/PhysRevA.76.053807.

Cite as: https://hdl.handle.net/21.11116/0000-0001-DD95-E

Abstract

We study the frequency-angular line shape for a phase-matched nonlinear process producing entangled states and show that there is a continuous variety of maximally entangled states generated for different mismatch values within the natural bandwidth. Detailed considerations are made for two specific methods of polarization entanglement preparation, based on type-II spontaneous parametric down-conversion (SPDC) and on SPDC in two subsequent type-I crystals producing orthogonally polarized photon pairs. It turns out that different Bell states are produced at the center of the SPDC line and on its slopes, corresponding to about half-maximum intensity level. These Bell states can be filtered out by either frequency selection or angular selection, or both. Our theoretical calculations are confirmed by a series of experiments, performed for the two above-mentioned schemes of producing polarization-entangled photon pairs and with two kinds of measurements: frequency selective and angular selective.