title: Electro-optically switchable spatial-mode entangled photon pairs using a modified Mach-Zehnder interferometer.
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.
authors.affiliation: Department of Physics, IIT Delhi, New Delhi, India. jaslphy@gmail.com
authors.forename: Jasleen
authors.initials: J
authors.lastname: Lugani
authors.forename: Sankalpa
authors.initials: S
authors.lastname: Ghosh
authors.forename: Krishna
authors.initials: K
authors.lastname: Thyagarajan