  Recent experimental progress in quantum information processing with trapped
ions have demonstrated most of the fundamental elements required to realize a
scalable quantum computer. The next set of challenges lie in realization of a
large number of qubits and the means to prepare, manipulate and measure them,
leading to error-protected qubits and fault tolerant architectures. The
integration of qubits necessarily require integrated optical approach as most
of these operations involve interaction with photons. In this paper, we discuss
integrated optics technologies and concrete optical designs needed for the
physical realization of scalable quantum computer.
