Generation of four-photon polarization-entangled cluster states via cross-Kerr nonlinearity
利用交叉克尔非线性产生四光子偏振态簇态

We propose a scheme for generating four-photon polarization-entangled cluster states based on the cross-Kerr nonlinear interaction between field-modes. Compared with other schemes, our scheme introduces the idea of parity gate and uses the non-destructive measurement method based on homodyne detection, which is easier to implement in experiment.