含时磁场下具有单轴各向异性交换作用双自旋系统的Berry相位

讨论了含时磁场下具有单轴各向异性交换作用双自旋系统的瞬时本征态及其绝热周期演化下的Berry相位,并由此分析了单轴各向异性交换作用对自旋系统Berry相位的影响.     

Shor量子纠错码的改进和完善

利用量子异或门和Hadamard旋转门,设计了Shor量子纠错码的编码量子线路,提出了两种纠错方案以及实现这两种纠错方案的量子线路.     

Berry Phase of Composite System Induced by Time-Dependent Interaction

The Berry phase in a composite system induced by the time-dependent interaction is discussed. We choose two coupled spin-1/2 systems as the composite system： one of the subsystems is subjected to a static magnetic field, and the coupling parameters between two spins are controllable in time. We show that the time-dependent interaction can induce the Berry phase in a similar way as that a spin-1/2 system （qubit） is driven by an effective time-dependent magnetic field. Furthermore, using two consecutive cycles with opposite directions of both the static magnetic field as well as opposite signs of the coupling parameters, a nontrivial two-qubit unitary transformation purely based on Berry phases can be constructed.     

Entanglement sudden death induced by the Dzialoshinskii--Moriya interaction

In this paper, we study the entanglement dynamics of two-spin Heisenberg XYZ model with the Dzialoshinskii--Moriya (DM) interaction. The system is initially prepared in the Werner state. The effects of purity of the initial state and DM coupling parameter on the evolution of entanglement are investigated. The necessary and sufficient condition for the appearance of the entanglement sudden death (ESD) phenomenon has been deduced. The result shows that the ESD always occurs if the initial state is sufficiently impure for the given coupling parameter or the DM interaction is sufficiently strong for the given initial state. Moreover, the critical values of them are calculated.     

含时磁场下具有单轴各向异性交换作用双自旋系？…

讨论了含时磁场下具有单轴向异性交换作用双自旋系统的瞬时本征态及其绝热周期演化下的Ｂｅｒｒｙ相位,并由此分析了单轴各向异性交换作用对自旋系统Ｂｅｒｒｙ相位的影响。     

勿需测量坍缩假设的量子隐形传态方案

在Busch等勿需测量坍缩假设的单粒子态隐形传态方案的基础上，进一步研究了二粒子任意自旋态的隐形传递方案。     

含时磁场下具有单轴各向异性交换作用双自旋系统的Berry相位

讨论了含时磁场下具有单轴各向异性交换作用双自旋系统的瞬时本征态及其绝热周期演化下的Berry相位,并由此分析了单轴各向异性交换作用对自旋系统Berry相位的影响.     

全同费米子系统的量子隐形传态

全同费米子系统的量子隐形传态比可分辨粒子系统的量子隐形传态更为复杂。通过引入空间自由度的方法，提出了一种适用于不可分辨费米子系统的量子隐形传态方案。     

Shor量子纠错码的改进和完善

利用量子异或门和Ｈａｄａｍａｒｄ旋转门,设计了Ｓｈｏｒ量子纠错码的编码量子线路,提出了两种纠错方案以及实现这两种纠错方案的量子线路。