Teleportation of three-dimensional single particle state in noninertial frames

Considering the spin degree of freedom of the Dirac field, we study the entanglement behavior of a different class of communication channel and teleportation of three-dimensional single particle state in noninertial frames. Numerical analysis shows that the communication channel in our scheme can offer enough distillable entanglement for the teleportation protocol. Moreover, the teleportation protocol could work well if Rob＇s acceleration is not very big, but the fidelity of the teleportation is still reduced due to the Unruh effect.     

Generation of steady four-atom decoherence-free states via quantum-jump-based feedback

A scheme is presented tor generating steady tour-atom decoherence-tree states via tour atoms with the Raman level configuration interacting with a single-mode vacuum cavity field by using quantum-jump-based feedback. The scheme meets the condition of a strongly dissipative cavity easily and has a simplified feedback control. Although the spontaneous emission still plays a negative role in the proposed system, we can improve the feedback control to reduce its effect.     

在非惯性系中处于热库中的两个腔的纠缠动力学

研究了非惯性系中处于热库中的两个腔的纠缠动力学.不仅考虑了加速参数对纠缠的影响,还考虑了Unruh单粒子态左右成分之间的不同比率对纠缠的影响.结果表明:加速参数一定时,随着腔间纠缠的减少,热库间的纠缠将会增加;此外,当初始状态为最大纠缠,并且,|qR|=1时,粒子和反粒子模之间会产生纠缠的再分配;发现当|qR|=|qL|=1/√2,在无限加速参数下发生纠缠猝死现象;当qR1/√2时,纠缠在有限加速参数下就会发生纠缠猝死现象.     

基于绝热捷径的两原子相位门设计

基于绝热捷径技术,我们提出了一个通过设计共振脉冲,仅用一个操作步骤便实现两原子相位门的理论方案。我们讨论了原子自发辐射和腔中光子泄漏对方案的影响,数值结果表明当前方案对上面的两种耗散效应和试验参数的误差都具有鲁棒性。此外,本方案所需的演化时间非常短并且在整个演化过程中都不需要额外引入复杂的脉冲。因此,这个方案在当前实验条件下是比较容易实现的。