  In this paper, we proposed a design of integrated programmable
controlled-phase (CPHASE) gate to be used in quantum information processing
applications. This gate is capable of introducing arbitrary phase difference to
target qubit in the case of control qubit being in the state of |1>. Because
the desired phase difference is possible to be utilized after fabrication
unlike the conventional controlled-phase gates which provide hard-coded phase
shift, such an integrated gate is expected to pave the way for more versatile
operations of current integrated optical circuits as well as possible new
applications.
