论文标题
Einstein-Podolsky-Rosen-Rosen转向量子相的量子阶段的转向
Einstein-Podolsky-Rosen steering of quantum phases in a cavity Bose-Einstein condensate with a single impurity
论文作者
论文摘要
我们研究了由单个杂质掺杂的腔bose-Einstein冷凝物（BEC）产生的量子相模型（GDM）中量子相（GDM）中量子相的Einstein-Podolsky-Rosen（EPR）转向特性。结果表明，GDM的正常和超级阶段表现出丰富的EPR可识别性。在正常阶段，存在从腔场（冷凝原子）到凝结原子（腔场）的单向EPR转向。在超级阶段，有单向或双向EPR转向，用于腔场和凝结原子。发现单个杂质可以充当EPR转向的单原子开关，以控制单向EPR转向的转向方向以及单向和双向EPR转向之间的过渡，通过打开或关闭杂质-BEC耦合。事实证明，EPR转向参数可以通过QPT临界点的EPR转向参数的突然变化来见证量子相变（QPT）的发生。我们的结果为操纵宏观EPR转向的新方法开辟了新方法，并通过微观杂质原子目睹了GDM中正常阶段和超级阶段之间的QPT。
We study Einstein-Podolsky-Rosen (EPR) steering properties of quantum phases in the generalized Dicke model (GDM) generated by a cavity Bose-Einstein condensate (BEC) doped with a single impurity. It is shown that the normal and superradiant phases of the GDM exhibit much rich EPR steerability. In the normal phase, there exist one-way EPR steering from the cavity field (condensed atoms) to condensed atoms (the cavity field). In the superradiant phase, there is either one-way or two-way EPR steering for the cavity field and condensed atoms. It is found that the single impurity can act as a single-atom switch of the EPR steering to control the steering direction of one-way EPR steering and the transition between one-way and two-way EPR steering through switching on or off the impurity-BEC coupling. It is proved that the EPR steering parameters can witness the quantum phase transition (QPT) occurrence through the sudden change of the EPR steering parameters at the critical point of the QPT. Our results open a new way to manipulate macroscopic EPR steering and witness the QPT between the normal phase and the superradiant phase in the GDM through a microscopic impurity atom.
