基于腔QED制备W纠缠态

摘要

We propose a scheme to generate two-photon four-particle W state with maximized fidelities by means of nonresonant interaction between one three-level Rydberg atom and four cavities via two-photon process. The scheme requires the four cavities initially prepared in the vacuum state and the atom in the excited state. We ob-tain desired W state by choosing proper the atom-field interaction time. Numerical calculation demonstrates that our scheme is experimentally feasible and has higher fidelity.%本文基于腔QED提出了一种制备双光子四粒子体系W纠缠态的新方案。该方案通过双光子过程，利用一个三能级原子与四个腔场发生非共振相互作用制备出具有最大保真度的W纠缠态。要求四个腔场最初处于真空态，原子最初处于激发态，通过合适选择原子与腔场之间的相互作用时间可以获得该态的最大保真度以及成功几率。并且通过讨论表明该方案具有一定的实验可行性。