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We present a realization of two-qubit controlled-phase gate, based on thelinear and nonlinear properties of the probe and signal optical pulses in anasymmetric GaAs/AlGaAs double quantum wells. It is shown that, in the presenceof cross-phase modulation, a giant cross-Kerr nonlinearity and mutually matchedgroup velocities of the probe and signal optical pulses can be achieved whilerealizing the suppression of linear and self-Kerr optical absorptionsynchronously. These characteristics serve to exhibit an all-optical two-qubitcontrolled-phase gate within efficiently controllable photon-photonentanglement by semiconductor mediation. In addition, by using just polarizingbeam splitters and half-wave plates, we propose a practical experimental schemeto discriminate the maximally entangled polarization state of two-qubit throughdistinguishing two out of the four Bell states. This proposal potentiallyenables the realization of solid states mediated all-optical quantumcomputation and information processing.

The two-qubit controlled-phase gate based on cross-phase modulation in GaAs/AlGaAs semiconductor quantum wells