Preparation and analysis of C-GHZ state based on via weak cross-Kerr nonlinearity

Abstract

Abstract: In order to solve the complex problem of concatenated GHZ（C-GHZ） state preparation, an improved scheme of C-GHZ state based on weak cross Kerr nonlinearity is proposed. Using the packaged optical element module and HWP22.5°half-wave plate, combined with the homodyne detection technology and classical feed forward, the nm-GHZ state is derived from the simple C-GHZ state by repeated operation, and finally the preparation law of C-GHZ state is obtained. The required number of auxiliary single photons is nm, the number of modules is nm-1, and the number of HWP22.5° is n. The success rate simulation and feasibility analysis are conducted. Results show that increasing the amplitude intensity of coherent state and reducing the loss of photon transmission can improve the success rate of C-GHZ state preparation.

Key words: quantum optics, C-GHZ state, weak cross- Kerr nonlinearity, homodyne detection

WU Chao, HU Zhanning. Preparation and analysis of C-GHZ state based on via weak cross-Kerr nonlinearity[J]. Chinese Journal of Quantum Electronics.

References

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