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International Journal of Modern Physics B

DIPOLE SQUEEZING OF THE ATOM IN A TWO-ATOM SYSTEM: EFFECTS OF THE SUPERPOSITION STATES

Mubeen A. Mir

Published Aug 15, 1994• 1 citation
Publisher

Abstract

Dipole squeezing of the atom in the presence of another atom is investigated for the one-photon and two-photon transition mechanism with the initial atoms in the two-atom squeezed state and the field in a vacuum, a coherent, or a squeezed state. For a vacuum input, the degree of squeezing is shown to depend on the photon multiplicity 'm' and the superposition angles of the atoms, θ1 and θ2. One of the quadratures of the atomic polarization is found to exhibit permanent squeezing only for some nonzero values of θ1, as well as θ2. The effect of θ2 on the dipole squeezing, however, is found to be negligible for the initial field in a coherent or a squeezed state. A comparison with the dipole squeezing of a single atom is also presented.

DOI
10.1142/s0217979294001019

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This paper studied the atomic dipole amplitude squared squeezing in the system of a three level atom interacting with a single mode radiation vacuum field. Numerical method is adopted to discuss the influence of the relative value of atom field coupling constants and the atomic initial coherence on the squeezing effect. It is found that no squeezing is produced in the process of interaction if the atom is initially most excited or in its ground state. However, if the atom is initially in a coherent superposition state of the ground state and the most excited state, there will be dipole amplitude squared squeezing effect in the process of interaction; the squeezing degree depends on the phase factor relating to atomic initial coherence; when other conditions are fixed, the atom will produced optimum squeezing effect if the probability of atom initially in the most excited state is 1/4 and the probability of it initially in the ground state is 3/4. If none of the atom field coupling constants are zero, the quantities of squeezing vary periodically; the change period of the quantities of squeezing depends on the relative value of two atom field coupling constants.