隧穿量子点分子的Wigner-Yanase偏态信息

Wigner-Yanase skew information of a tunneling quantum dot molecule

为从量子信息角度理解隧穿量子点的物理过程,文中研究了与单模腔场相互作用的隧穿量子点分子的WignerYanase偏态信息,分析了各能级上布居数时间演化与量子点间电子隧穿耦合系数的关系,着重讨论了平均光子数、失谐量以及隧穿耦合系数对Wigner-Yanase偏态信息的影响.结果发现:各个能级上的布居数演化呈现出典型的塌缩和复原现象,隧穿耦合系数增大,塌缩时间变长.偏态信息演化周期随平均光子数的增大而增大,失谐量会影响布居数塌缩区间偏态信息的振荡次数.

In order to understand the physical process of a tunneling quantum dot molecule in terms of quantum information,we investigate the Wigner-Yanase skew information of a tunneling quantum dot molecule interacting with a single-mode cavity field,and analyze the relationship between the time evolution of population on each level and the tunneling coupling constant.Meanwhile,the emphasis is placed on the discussion of the influence of the mean photon number,the detuning and the tunneling coupling constant on the Wigner-Yanase skew information.The results show that there are typical collapses and revivals on each level.The collapse period of population increases with the increasing of the tunneling coupling constant.The period of time evolution of Wigner-Yanase skew information increases with the increasing of the mean photon number,and the oscillation frequency of Wigner-Yanase skew information during collapses is affected by the detuning.