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Journal of Modern Optics

Three-level Atom in a Squeezed Vacuum I

S. Smart, S. Swain

Published Oct 1, 1993• 17 citations
Publisher

Abstract

We consider a three-level atom in any of its possible configurations, ladder, lambda or vee, which interacts with two classical, resonant, monochromatic electromagnetic fields. We suppose the levels
DOI
10.1080/09500349314551961

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The authors consider a three-level atom in the ladder configuration, which interacts with two classical, monochromatic electromagnetic fields. The laser driving the mod 0) to mod 1) transition is intense, whilst the laser connecting the mod 1) to mod 2) transition is weak. In addition, a squeezed vacuum field is centered on the mod 0) to mod 1) transition. They calculate the optical double resonance spectrum for this system, and show that it depends very sensitively on the squeezing phase and degree of squeezing. Normally the ODR spectrum consists of two peaks, but when the population trapping condition of Courty and Reynaud (1989) is satisfied, one of the peaks disappears. The observation of the ODR spectrum could provide a means of detecting a squeezed field.
We present the results of a theoretical study of the output amplitude noises of a four-level atomic system in vee + ladder configuration. The difference and connection of electromagnetically induced transparency and Autler–Townes splitting effects are investigated theoretically. The output amplitude noise of the probe field of two effects were compared, the quantum properties of the input field of the thin medium and the thick medium under Autler–Townes splitting or electromagnetically induced transparency (EIT) condition are maintained, the higher fidelity is obtained in the storage of the thick medium under the condition of EIT in non-classical states. The noise characteristics of the squeezed vacuum field after four-level coherent medium are studied; the noise of the output field is lowest when the detection light is far away from detuning. The double split of EIT window was made by the dynamic Stark splitting on the ground state of control field, the quantum properties of the input field in the strong-control field and strong-coupling field were maintained. The output noise spectrum is divided with the increase in the field strength, the maximum output squeezing is far away from the resonance.