Abstract
The double-crystal scheme for polarization-entangled photon pairs generation is presented. The negative impact of the Migdall effect on the polarization entanglement is fully compensated in the scheme. The theory for quantifying of entanglement decrease as the action of the Migdall effect is formulated.
Highlights
Sources of polarization-entangled photon pairs are key stone in experimental quantum optics [1] and applications [2]
In the scheme the two nonlinear crystals may be arbitrarily rotated around the pump wavevector direction
We show that there are special angles of the crystal rotation [12] where the Migdall effect does not affect the entanglement of generated photon pairs
Summary
Sources of polarization-entangled photon pairs are key stone in experimental quantum optics [1] and applications [2]. We analyze the generalized double crystal scheme (Fig. 1). In the scheme the two nonlinear crystals may be arbitrarily rotated around the pump wavevector direction.
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