  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 easily be extended to spatial N-mode
input quantum states. Apart from its usefulness to characterize optical quantum
states, it is also emphasized its application to the measurement of the
so-called generalized quantum polarization.
