Effect of the dispersion on multipartite continuous-variable entanglement in optical parametric ampl

• 作 者: 赵超樱
• 机 构: College of Science, Hangzhou Dianzi University,State Key Laboratory of Quantum Optics and Quantum Op
• 出 处: Chinese Physics B
• 发表日期: 2015年04期
• 关键词: entanglement amplifier adopt variance parametric criterion amplification biparti

Based on the quantum fluctuations, we adopt the method of generalized V1 criterion to investigate multipartite entanglement characteristics in an optical parametric amplification system with the consideration of dispersion. The nonlinear interaction becomes strong because of the existence of dispersion coefficient σ. Considering the influence of dispersion factor σ, with increasing the pump parameter μ, the value of minimum variance V1 decreases and the squeezing curve nearly equals 1/(1 + μ). The larger particle number N results in a smaller variance and higher entanglement.

Based on the quantum fluctuations, we adopt the method of generalized V1 criterion to investigate multipartite entanglement characteristics in an optical parametric amplification system with the consideration of dispersion. The nonlinear interaction becomes strong because of the existence of dispersion coefficient σ. factor σ, with increasing the pump parameter μ, the value of minimum variance V1 decreases and the squeezing curve nearly equals 1 / (1 + μ). The larger particle number N results in a smaller variance and higher entanglement.