双∧型三能级原子与双模光场实现两比特量子交换门

A Cavity QED Scheme of Double ∧-type Three-level Atom Coupling Two-mode Cavity-field for Two-qubit Swap Gate

两比特量子交换门是十分重要的逻辑门。若采用组合方式构造三个两比特受控相位门和六个Hadamard门才能实现交换逻辑门的功能。该文提出直接一步构造量子交换门的方案,可以减少逻辑门的操作个数,既节省资源又降低实验难度。而且整个操作过中原子都不会被激发到激发态上,因此不受原子自发辐射影响。

The two-qubit quantum swap gate is very important for quantum information and quantum computing.Researcher can construct this swap gate using three two-qubit controlled phase gates and six Hadamard gates through combination way.In this paper, we propose a scheme to construct quantum gate directly, which can reduce the number of operations of logic gates. It is help to save the resources and reduce the difficulty in the experiment.The atom in the whole operation does not occupy the excited state,so it is robust against spontaneous emission of atoms.