Optics Letters 2017-07-10

Entanglement in a four-wave mixing process

Zhan Zheng, Hailong Wang, Bing Cheng, and Jietai Jing

Index: 10.1364/OL.42.002754

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Abstract

We investigate different kinds of entanglement in a four-wave mixing process with a degenerate pump. After analyses on means and quantum fluctuations of the three output beams (Stokes, anti-Stokes, and pump), we verify the existence of genuine tripartite entanglement, and quantify bipartite, two-mode, as well as tripartite entanglement with the covariance matrix. We find out that the input pump power and the nonlinear coupling strength are the physical origins to enhance entanglement at a given photon loss.