Quantum coherence and entanglement control for atom-cavity systems

Zhi‐Rong Zhong

We study the dynamics of a coupled cavity system composed of three cavities, and propose a scheme for the coherent manipulation of two collective atomic modes by a control atom. In the scheme, the control atom and two atomic ensembles interact with the local cavity mode, while the control atom is externally driven by a laser field. We show that under certain conditions, the dynamics of the whole system are reduced to an effective coherent coupling between the control atom and two collective atomic modes, while the cavity fields are only virtually excited. We also study the dynamics of the entanglement generation of the two distant collective atomic modes. The scheme provides a potential application for quantum-state engineering and quantum control.

J. M. Raimond

Joerg Bochmann, B. Weber, Holger Specht +6 more

Yuying An

The physics system consisting of coherent coupled-atom interaction with coherent single-mode cavity-field is proposed. Using the complete quantum theory, the evolution process of the system is studied. It is found that the quantum atom entangled states and light field entangled states can be transferred into each other under a certain temporal condition. Otherwise, the initial state of the atom or the light field entangled states can be completely preserved by controlling the time of the atoms interaction with the light fields.

Han Feng, Xia Yun

We use quantum theory and numerical method to study the non-local three-atom system quantum characteristic.The initial state of the three-atom system is on the three-body entangled W state,and the two atoms A,B can interact resonantly with a single-mode field in the coherent state.During the course of Cavity-QED evolution of the total system,we make Bell measurements to the atoms A and B. Through operating the intensity of the coherent field and the dipole-dipole coupling interaction between atoms A and B,we can control the atomic occupancy of atom C outside of the cavity.After taking photon detection to the coherent field,we can control C atomic dipole squeezing through manipulating the evolution time,the number of the detected photons,the parameter of coherent field and the dipole-dipole coupling interaction between atoms A and B So we are easy to remotely control the quantum character of the atom outside of the coherent cavity.

Perry R. Rice, James Clemens, Nick Cummings +1 more