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- W2056732101 abstract "In this short review some essentials concerning creation and testing of nonclassically correlated photons (biphotons) aregiven. In the introduction we remind the role which the experimentally produced entangled states have been playing forthe foundations of the quantum physics, by witnessing against the model of local hidden variables. The well establishedsources of biphotons are based on spontaneous parametric down conversion in nonlinear crystals. A popular source withtwo BBO crystals is described, which generates pairs of photons nearly maximally entangled in polarization. Crystalbasedsources rely on intrinsically broadband transitions, therefore thus produced biphotons are also broadband.Additional efforts (like applying optical cavities) are needed to reach narrowband biphotons which would comply withthe requirements of some implementations in the quantum communication science. The topical issue of our article is areview of another, more recent approaches based on narrowband transitions between levels in cold atoms. Such methodprovides naturally narrowband biphotons. First, the principles are given of an atomic source of nonclassically pairedphotons, which is operated in a pulsed write-read mode. Such source is based on two separated in time Ramantransitions triggered successively in two Λ-schemes. Next, cw-mode sources based (mainly) on spontaneous four wavemixing process (SFWM) are presented in a generic four-level scheme. Some underlying physics is sketched and profilesof biphoton correlation functions in the time domain are explained. Among other presented SFWM sources, one provesin testing high degree entanglement of generated biphotons, both in time-frequency and polarization(hyperentanglement)." @default.
- W2056732101 created "2016-06-24" @default.
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- W2056732101 date "2015-01-08" @default.
- W2056732101 modified "2023-09-23" @default.
- W2056732101 title "Nonclassically paired photons from sources based on cold atoms" @default.
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- W2056732101 doi "https://doi.org/10.1117/12.2179505" @default.
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