By using the two-mode approximation and SU(2) coherent-state representation, the macroscopic quantum coherent tunneling and Jophson tunneling are studied in the case where the rotating frequencies of the external perturbations are fixed.
In coherent-state representation, we introduce a concise approach to dealwith the Jaynes-Cummings(JC)model, in which the purely quantum mechanical problem is reduced to the solution of some differential equations.
In this paper we using the time evolution factor,have giren by that the initia state of single mode electromagnetic field is coherence state and another one is coherence of squeezing state, even coherence state,odd coherence state, respectiely, the influence of the interaction between the field and the atom to the atomic population evolution versus the time.
The time evolution of a quantum state of mesoscopic LC circuit are studied in detail by using thermo-field dynamics (TFD) at a finite temperature. The result indicates that the quantum state of a mesoscopic LC circuit evolves from the thermal vacuum state to coherence state and go on by the action of an external impulse functional signal on the circuit;
Simple estimate of the critical length of a quantum communication channel with attenuation for coherent-state quantum cryptograp
Entanglement fidelity of coherent-state teleportation with asymmetric quantum channel
Method of collective degrees of freedom in spin-coherent-state path integral
The resulting effective action turns out to be such that both the center position and the chirality can be formally described by a boson-coherent-state path integral.
In this program, some of the less traditional mathematical methods employed are (i) coherent-state representations, (ii) reproducing kernel Hilbert spaces, and (iii) functional-integral representations involving a continuous-time regularization.