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Azimuthal entanglement and multichannel Schmidt-type decomposition of non-collinear biphotons

Purely azimuthal entanglement is analyzed for noncollinear frequency-degenerate biphoton states. The degree of azimuthal entanglement is found to be very high, with the Schmidt parameter $K$ on the order of the ratio of the pump waist to its wavelength. A scheme is suggested for partial realization of this high entanglement resource in the form of a multichannel Schmidt-type decomposition.

preprint2016arXivOpen access
M. V. Fedorov
quant-ph
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M. V. Fedorov

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