基于腔QED系统的几何量子失谐及其传送

研究了基于腔量子电动力学（腔QED）系统的几何量子失谐及其传送。该系统包括两个独立的子系统，每个子系统由两个二能级原子与单模腔共振相互作用。结果表明，所有初始存储在原子A1A2中的几何量子失谐最终被转移到原子B1B2和腔C1C2。同时，原子A1A2 ，B1B2和腔C1C2的几何量子失谐在该量子系统中可以发生猝死（DSD）以及纠缠突然死亡（ESD）。但是，在该量子系统中几何量子失谐不能完全由于原子的自发辐射和腔衰减而复活。此外，原子A1A2 ，B1B2和腔C1C2几何量子失谐的量，取决于其纯度p，并与其成比例，p的值越小，几何失谐越小。它也表明，在原子自发辐射和腔衰减的情况下，原子A1A2 ，B1B2和腔C1C2的几何量子失谐将经历振荡衰减并最终衰减到零。不过，在没有原子自发辐射和腔衰减的情况下，原子A1A2 ，B1B2和腔C1C2的几何量子失谐却没有衰减。

The dynamics of geometric discord and its transfer in cavity quantum electrodynamics system

We investigate the dynamics of geometric discord and its transfer in a cavity quantum electrodynamics (cavity QED) system consisting of two independent subsystems each of which consists two two-level atoms resonantly interacting with a single-mode cavity. It is shown that all the geometric discord initially stored in the atoms A1A2 is eventually transferred to atoms B1B2 and cavities C1C2. Meanwhile, the geometric discord of atoms A1A2, atoms B1B2 and cavities C1C2 can exhibit discord sudden death (DSD) as well as entanglement sudden death (ESD) in the presented quantum system. However, it is shown that the geometric discord cannot revive completely due to the atomic spontaneous emission and cavity decay. Furthermore, the amount of geometric discord of atoms A1A2, atoms B1B2 and cavities C1C2 depends on the purity p and it is proportional to p , the smaller the value of p, the smaller the amount of geometric discord. It is also shown that the geometric discords of atoms A1A2, atoms B1B2 and cavities C1C2 all experience oscillatory damping and eventually decay to zero in the long-time limit in the case of the atomic spontaneous emission and cavity decay. However, in the case of without atomic spontaneous emission and cavity decay, the geometric discords of atoms A1A2, atoms B1B2 and cavities C1C2 can periodically alter from time t=0 , there is no damping for the geometric discord.