Artículos de revistas
Numerical investigation of the quantum fluctuations of optical fields transmitted through an atomic medium
Fecha
2008Registro en:
PHYSICAL REVIEW A, v.77, n.1, 2008
1050-2947
10.1103/PhysRevA.77.013806
Autor
LEZAMA, A.
VALENTE, P.
FAILACHE, H.
Martinelli, Marcelo
Nussenzveig, Paulo Alberto
Institución
Resumen
We have numerically solved the Heisenberg-Langevin equations describing the propagation of quantized fields through an optically thick sample of atoms. Two orthogonal polarization components are considered for the field, and the complete Zeeman sublevel structure of the atomic transition is taken into account. Quantum fluctuations of atomic operators are included through appropriate Langevin forces. We have considered an incident field in a linearly polarized coherent state (driving field) and vacuum in the perpendicular polarization and calculated the noise spectra of the amplitude and phase quadratures of the output field for two orthogonal polarizations. We analyze different configurations depending on the total angular momentum of the ground and excited atomic states. We examine the generation of squeezing for the driving-field polarization component and vacuum squeezing of the orthogonal polarization. Entanglement of orthogonally polarized modes is predicted. Noise spectral features specific to (Zeeman) multilevel configurations are identified.