Spatial entanglement of paired photons generated in cold atomic ensembles

Details Spatial entanglement of paired photons generated in cold atomic ensembles Spatial entanglement of paired photons generated in cold atomic ensembles

2008-04-21

arxiv.org/abs/0804.3257v2

Phys. Rev. A 78, 052301 (2008)

Physics

Quantum Physics

5 pages, 4 figures. Submitted to Phys. Rev. A.; one figure (Fig. 3) was added, typos and labels in figure 2 were corrected

Scientific paper

10.1103/PhysRevA.78.052301

Cold atomic ensembles can mediate the generation of entanglement between pairs of photons. Photons with specific directions of propagation are detected, and the entanglement can reside in any of the degrees of freedom that describe the whole quantum state of the photons: polarization, spatial shape or frequency. We show that the direction of propagation of the generated photons determines the spatial quantum state of the photons and therefore, the amount of entanglement generated. When photons generated in different directions are combined, this spatial distinguishing information can degrade the quantum purity of the polarization or frequency entanglement.

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