Quantum entanglement with cavities and atoms

Yang Zhi-yong

A physical system which consists of the multimode cavity fields and the coupling atoms was proposed.In this system,a novel way of translating quantum entangled information has been discovered.The atoms can get the quantum entangled information stored in the entangled state of the cavity field when the atoms,which all are initially in ground state,cross the cavities with a controlled speed.And the atoms can release the quantum entangled information into the vacuum state cavities when the entangled state atoms cross the cavities.By this means,one can realize the entangled information exchange between cavities and atoms.The quantum entangled information transferring between two sets cavities was also discussed using the atomic properties which the atoms can pick up and release quantum entangled information. Besides,the quantum information can be preserved under the different time conditions.

M. Brune

S. Haroche

Changyong Chen, Yan Yu

We propose a scheme for realizing quantum entanglement swapping between the atoms in cavity QED. With only virtual excitation of the cavity during the interaction between the atoms and cavity, the scheme is insensitive to the cavity mode states and the cavity decay. The ideas can also be utilized for realizing entanglement swapping between the atomic levels in a single atom and the atomic levels in the Bell states and between the atomic levels in the Bell states and the atomic levels in the W states.

H T Fung

Rong‐Can Yang, Pengfei Zhang, Yanqiang Guo +1 more

Quantum entanglement dynamics for two atoms trapped in two coupled cavities is investigated. Numerical results show that the present of the two atomic excitations is mainly accounted for the entanglement-sudden-death (ESD) effect with the two cavities initially in the vacuum. The entanglement can also be controlled by the hopping rate and the imbalances between the two atom-cavity coupling rates.