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## High resource of azimuthal entanglement in terms of Cartesian variables of noncollinear biphotons

Physical Review A: Atomic, Molecular, and Optical physics. 2018. Vol. 97 . No. 1. P. 012319-1-012319-7.

Федоров М. В.

Purely azimuthal entanglement is analyzed for non-collinear 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.

Keywords: Quantum entanglement

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