Squeezing effect in a driven coupled-oscillator system: A dual role of damping

Journal Article · Sat Feb 01 04:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.67.023801· OSTI ID:20633758

Nha, Hyunchul ^[1]

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1. School of Physics, Seoul National University, 151-742 Seoul (Korea, Republic of)

We investigate in detail the role of a reservoir concerning the squeezing effect in a driven coupled-oscillator system. In our model, a harmonic oscillator (single cavity mode) is coupled to a two-state oscillator (two-level atom) driven by a classical field. The oscillators are coupled to their respective reservoirs, by which the oscillators are damped. The degree of squeezing in the short-time limit is found to be independent of the damping rate of the harmonic oscillator in a perturbative regime. More remarkably, the harmonic oscillator, which is in a coherent state in the absence of its reservoir, gets squeezed in the steady state when it is coupled to the reservoir. The reservoir assumes two competing roles of assisting and suppressing the squeezing effect induced by the nonlinear interaction of the coupled oscillators. As a result, the squeezing effect is increased to some extent with the damping rate of the harmonic oscillator. In addition, the 'matching condition' for the optimal squeezing is obtained such that the pumping field intensity should be inversely proportional to the damping rate.

• OSTI ID: 20633758
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 67; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANNIHILATION OPERATORS
ATOMS
BASIC INTERACTIONS
DAMPING
EIGENSTATES
HARMONIC OSCILLATORS
NONLINEAR PROBLEMS
OPTICS
QUANTUM MECHANICS