Quantum phase properties of a state driven by a classical field. (English) Zbl 07880118
Summary: We consider a nonclassical state generated by an atom-cavity field interaction in presence of a driven field. In the scheme, the two-level atom is moved through the cavity and driven by a classical field. The atom interacts dispersively with the cavity field, which results in a photon-number-dependent Stark shift. Assuming that the atom enters the cavity in the excited state \(|{a} \rangle\), the obtained output cavity field is taken into account. The state vector \(|\psi (t)\rangle\) describes the entire atom-field system but in our work we deal with the statistical aspects of the cavity field only. The quantum state that corresponds to the output cavity field is obtained by tracing out the atom part from \(|{\psi (t)} \rangle \langle{\psi (t)} |\). Different quantum phase properties such as quantum phase distribution, angular \(Q\) phase function, phase dispersion are evaluated for the obtained radiation field. The second-order correlation function \(g^2(0)\), an indirect phase characteristic is also considered.
MSC:
| 81Pxx | Foundations, quantum information and its processing, quantum axioms, and philosophy |
| 81-XX | Quantum theory |
| 81Vxx | Applications of quantum theory to specific physical systems |
Keywords:
atom-cavity interaction; driven classical field; quantum phase distribution; angular Q phase function; phase dispersionReferences:
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