TL;DR
This paper demonstrates that complex absorption spectra can enhance quantum squeezing in resonance fluorescence by acting as a spectral filter and improving phase matching, contrary to typical expectations of absorption's detrimental effects.
Contribution
It reveals that absorption can improve quantum coherence effects, specifically squeezing, in semiconductor quantum wells, a novel insight into the role of absorption in quantum optics.
Findings
Absorption spectra can enhance quantum squeezing.
Absorption acts as a spectral filter improving phase matching.
Surprising positive role of absorption in quantum coherence.
Abstract
Absorption is usually expected to be detrimental to quantum coherence effects. However, the situation for complex absorption spectra has been little studied yet. We consider the resonance fluorescence of excitons in a semiconductor quantum well. The creation of excitons requires absorption of the incoming pump-laser light. Thus, the absorption spectrum of the medium acts as a spectral filter for the emitted light. Surprisingly, absorption can even improve quantum effects, as is demonstrated for the squeezing of the resonance fluorescence of the quantum-well system. This effect can be explained by an improved phase matching due to absorption.
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