Space-time descriptions of quantum fields interacting with optical cavities

作者：Gea Banacloche Julio^*

来源：Physical Review A, 2013, 87(2): 023832.

DOI：10.1103/PhysRevA.87.023832

The purpose of this paper is to compare two unitary, deterministic approaches to the study of the interaction of quantized fields with atomic systems in optical cavities. In particular it is shown that the "modes of the universe" approach, in which each mode has both an intracavity and an outside part, is formally equivalent, in an appropriate limit, to the better known "input-output" formalism in its unitary (i.e., Hermitian-Hamiltonian based) form; the latter may be called a "quasimode" theory, since it treats the field inside the cavity as a separate degree of freedom. Differences that arise between the two approaches for numerical calculations involving a finite set of discrete modes are also pointed out. The formalism is illustrated with an in-depth discussion of the explicit solution for a single-photon pulse, of arbitrary shape and detuning, incident on a cavity containing a two-level atom. DOI: 10.1103/PhysRevA.87.023832

• 出版日期2013-2-22