Engineering Continuous Variable and Coherent State Bell-Like States in a Reconfigurable Photonic Chip

In this paper, we propose a versatile integrated optical chip with the ability to generate both coherent and squeezed Bell-like states for quantum information processing purposes. This is a reconfigurable quantum photonic circuit in a lithium niobate substrate, which produces both non-local addition and subtraction of photons on squeezed vacuum states with directional couplers and post-selection. Setting appropriately phases and powers of the input beams, as well as electro-optic phase shifts, coherent and continuous variable Bell-like states are obtained. An analysis of the device operation in both the ideal and realistic scenarios is presented.