利用高精细度双模腔制备四粒子GHZ和W态

Generation of two-dimensional cluster states by using high-finesse bimodal cavities

We propose two novel schemes to generate the two-dimensional 2xN and 3xN cluster states by using a chain of (two-level) Rydberg atoms in the framework of cavity QED. These schemes work in a completely deterministic way and are based on the resonant interaction of the atoms in a chain with a bimodal cavity that supports two independent modes of the photon field. We demonstrate that a 2xN cluster state can be generated efficiently with only a single bimodal cavity, while two such cavities are needed in order to construct a 3xN cluster state. It is shown, moreover, how these schemes can be extend…

Atom-mediated effective interactions between modes of a bimodal cavity

We show a procedure for engineering effective interactions between two modes in a bimodal cavity. Our system consists of one or more two-level atoms, excited by a classical field, interacting with both modes. The two effective Hamiltonians have a similar form of a beam-splitter and quadratic beam-splitter interactions, respectively. We also demonstrate that the nonlinear Hamiltonian can be used to prepare an entangled coherent state, also known as multidimensional entangled coherent state, which has been pointed out as an important entanglement resource. We show that the nonlinear interaction …

腔中三个囚禁离子的多体纠缠及W态的产生

Multipartite entanglement of three trapped ions in a cavity and W- State generation

提出了一种利用三个囚禁离子与高精细度腔中红边带单模光场相互作用产生三量子比特最大纠缠W态的方案。对于初始处于数态的腔场，计算了产生三个离子W态的几率。通过使用在实验实现中获得的离子腔耦合强度，W态产生所需的相互作用时间被发现是10 $μ$秒的顺序。研究发现，对于腔中一定数量的光子，通过适当选择初始态声子数，可以控制离子内态的纠缠性质。研究了类W态离子量子比特与腔光子的纠缠。得到了整体负性和部分$K-$方式负性（K=2 ~ 4）的解析表达式，研究了纠缠分布随相互作用参数的演化.观察到不同纠缠模式之间的可逆纠缠交换。对于特定的相互作用参数，三离子和光子-声子系统存在由双向和三向关联产生的四体纠缠。