Abstract

In this Letter, we propose and analyze a switchable integrated optical waveguide device employing a modified Mach–Zehnder interferometer, capable of generating nondegenerate, maximally spatial-mode entangled photon pairs. Using an integrated electro-optic phase modulator, we show the possibility of on-demand switching of spatial-mode entangled state from a Φ+ to a Ψ+ state and vice versa. Such a versatile device with the potential of easy manipulation of the “spatial-mode” degree of freedom, should be very interesting in realizing integrated optical chips for quantum information processing.

© 2012 Optical Society of America

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