Enhancement of Atom-Field Transfer of Coherence in a Two-Photon Micromaser Assisted by a Classical Field

Abstract

We investigate the transfer of coherence from atoms to a cavity field initially in a statistical mixture in a two-photon micromaser arrangement. The field is progressively modified from a maximum entropy state (thermal state) towards an almost pure state (entropy close to zero) due to its interaction with atoms sent across the cavity. We trace over the atomic variables, i.e., the atomic states are not collapsed by a detector after they leave the cavity. We find that by applying an external classical driving field it is possible to substantially increase the field purity without the need of previously preparing the atoms in a superposition of their energy eigenstates. We also discuss some of the nonclassical features of the resulting field.

Rabi Oscillations, Entanglement and Teleportation in the Anti-Jaynes-Cummings Model

“…Let us start by considering the entanglement properties of the initial state is a pure state. Next, we substitute the matrix form of ˆA ρ and ˆF ρ from Equation 24cinto Equation 23 as a pure separable state, agreeing with the definition in Equation (16).…”

“…Noting that fundamental features namely: collapses and revivals in the atomic inversion [13], generation of Schrdinger cat states of the quantized field [14] [15], transfer of atomic coherence to the quantized field [16], vacuum-field Rabi oscillations in a cavity [17] and many more have been extensively studied in the JC model in both theory and experiment in quantum optics, we now focus attention on the AJC model which has not received much attention over the years due to the erroneously assumed lack of a conserved excitation number operator.…”

Several Ways to Solve the Jaynes-Cummings Model

“…Its simplicity, however, does not affect the amount of phenomena arising from it. Among the many products we may think about, we may count: collapses and revivals in the atomic inversion [7], generation of Schrödinger cat states [3,4] of the quantized field, squeezing [5], transfer of atomic coherence to the quantized field [6], etc. Moreover, because of entanglement, the process of measuring atoms as they leave the cavity gives information about the field state, because while the atoms spend time in the cavity, they acquire knowledge of the field and as they leave the cavity and are measured, knowledge about the quantized field may be retrieved.…”