Non-Gaussianity dynamics of two-mode squeezed number states subject to different types of noise based on cumulant theory

作者：Xiang, Shaohua^*; Zhu, Xixiang; Song, Kehui

来源：Chinese Physics B, 2018, 27(10): 100305.

DOI：10.1088/1674-1056/27/10/100305

• non-Gaussianity
• cumulants
• squeezed number states
• decoherence

We provide a measure to characterize the non-Gaussianity of phase-space function of bosonic quantum states based on the cumulant theory. We study the non-Gaussianity dynamics of two-mode squeezed number states by analyzing the phase-averaged kurtosis for two different models of decoherence: amplitude damping model and phase damping model. For the amplitude damping model, the non-Gaussianity is very fragile and completely vanishes at a finite time. For the phase damping model, such states exhibit rich non-Gaussian characters. In particular, we obtain a transition time that such states can transform from sub-Gaussianity into super-Gaussianity during the evolution. Finally, we compare our measure with the existing measures of non-Gaussianity under the independent dephasing environment.

• 出版日期2018-10
• 单位怀化学院