Abstract
A new scheme is proposed to direct implement the optical two-qubit controlled-Z gate with the two-qubit polarization parity detector [Lin, et al., Phys. Rev. A. 80 (2009) 042311] based on weak cross-Kerr nonlinearity. The distinct advantage of the present scheme in contrast with the existing schemes is that the two-qubit polarization parity detector with classical information feed-forward allows the efficiency of our optical controlled-Z gate to be enormously enhanced due to avoiding effectively the photon bunching effects. Therefore, the present scheme is more efficient and more convenient than others in the applications of quantum communication.
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