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Optica Publishing Group
  • International Quantum Electronics Conference
  • 1996 OSA Technical Digest Series (Optica Publishing Group, 1996),
  • paper TuL20

Squeezing in spontaneous emission from a three- level cascade system

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Abstract

The generation of squeezed states of the electromagnetic field (EM) relies on phase-dependent nonlinear optical processes, which are manifest in the non-zero atomic coherences. These processes can, in general, be quite complicated, with a number of damping and pumping terms to be taken into account. However, the squeezing process may be more easily understood by studying simpler systems where phase dependent effects are still important. Obviously since squeezing is intrinsically a phase dependent phenomenon some phase information must initially be present. For the cascade case with equal field contributions for each transition the best squeezing occurs when the system is in a coherent superposition of the top and bottom states [1]. These results apply independently of any specific process the system is subjected to. The question then arises: Can squeezed light be generted in an initially unsqueezed field via spontaneous emission alone? In Figure 1, we show the time dependence of the normally ordered variance FCA(τ) for the optimally chosen quadrature component of the EM field emitted by a three level atom in the cascade condfiguration. The atom is initially prepared in a linear superposition of its states for which FCA(0)=0.

© 1996 Optical Society of America

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