Abstract
We present a short review of development and applications of single and biphoton sources. The main emphasis is on spontaneous parametric down-conversion (SPDC) sources capable of producing timecorrelated photon pairs. We also present a SPDC source of photon pairs at 1,064 nm pumped by a cw 532 nm laser. We consider the fundamental principles of quantum tomography and present results of characterization (entanglement and purity) of biphoton quantum states produced by this source. Additionally, we discuss some aspects of quantum entanglement suppression caused by the Migdall effect in a double-crystal scheme.
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