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Detection of two-mode spatial quantum states of light by electro-optic integrated directional couplers

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Abstract

We study both manipulation and detection of two-mode spatial quantum states of light by means of a reconfigurable integrated device built in an electro-optical material in a Kolgelnik–Schmidt configuration, which provides higher error tolerance to fabrication defects and larger integration density than other current schemes. SU(2) transformations are implemented on guided spatial modes in such a way that reconstruction of both the optical field-strength quantum probability distribution, via spatial two-mode homodyne detection, and the full optical field-strength wavefunction, by means of weak values, are carried out. This approach can be extended easily to spatial N-mode input quantum states. Apart from its usefulness to characterize optical quantum states, the approach also can be applied to the measurement of the so-called generalized quantum polarization.

© 2015 Optical Society of America

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