利用V-型三能级原子与双模腔场双光子大失谐相互作用制备W纠缠态

本文提出利用V-型三能级原子与双模腔场的双光子大失谐相互作用制备W纠缠态,该方案要求三个三能级原子和一个双模腔场,第一个与腔场作用的原子最初处于激发态,第二个和第三个原子均处于基态,腔场最初处于真空态,合适地选择原子与腔场之间的相互作用时间即可获得三原子W纠缠态.并且此方案可以推广至多原子W纠缠态和多腔场W纠缠态的制备;通过计算共生纠缠度研究系统中态的纠缠演化以及热纠缠现象.

Generation of W entangled states via two-photon large-detuned interaction of V-type three-level atoms and two-mode cavity-field

In this paper we present a scheme for generation of W entangled state by means of large-detuned interaction between V-type three-level atoms and two-mode cavity-field via two-photon process. The scheme requires three three-level atoms and one two-mode cavity. The atom is the first sent to interact with cavity previously prepared in excited state, the second atom and the third atom initially prepared in ground states and the cavity- field in the vacuum state. An appropriate choice of the atom-field interaction time allows one to obtain three-atom W entangled state. The scheme plays a significant role in preparation of multi-atom and multi-cavity W entangled states. The evolution of the entanglement and thermal entanglement are discussed by concurrence.