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Entanglement-enhanced two-photon absorption in spectral phase-modulated type-I parametric down-conversion

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Abstract

We demonstrate control of the two-photon absorption probability for a simple three-level atom using type-I nondegenerate down-converted photons that have been phase-modulated using a spectral phase filter of variable modulation frequency and modulation depth. We find enhancement of two-photon absorption for entangled photons, as compared with that for unentangled photons. We also find that, for certain pairs of modulation frequency and depth values, we can either further enhance or suppress the absorption process relative to that for zero phase modulation.

© 2015 Optical Society of America

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