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arXiv:1109.4375 · Physical Review A

External-field effect on quantum features of radiation emitted by a quantum well in a microcavity

Eyob Alebachew Sete, Sumanta Das, Hichem Eleuch

Published Feb 25, 2011• 19 citations
arXivHTMLPDF

Abstract

We consider a semiconductor quantum well in a microcavity driven by coherent light and coupled to a squeezed vacuum reservoir. By systematically solving the pertinent quantum Langevin equations in the strong-coupling and low-excitation regimes, we study the effect of exciton-photon detuning, external coherent light, and the squeezed vacuum reservoir on vacuum Rabi splitting and on quantum statistical properties of the light emitted by the quantum well. We show that the exciton-photon detuning leads to a shift in polariton resonance frequencies and a decrease in fluorescence intensity. We also show that the fluorescent light exhibits quadrature squeezing, which predominately depends on the exciton-photon detuning and the degree of the squeezing of the input field.

DOI
10.1103/physreva.83.023822

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Abstract In this paper we present a theoretical analysis of a scheme to enhance quantum statistical features of fluorescent light generated by a quantum well coupled to a degenerate optical parametric oscillator (DOPO) in a microcavity with an input squeezed field. We derive the quantum Langevin equations and solve them using Laplace transform method in the strong coupling regime. It is found that the intensity of the light is significantly enhanced while the normalized intensity spectrum remains largely unaffected by the external squeezed field. Additionally, the emitted light exhibits photon bunching, and the squeezing is notably improved, with the quadrature variance asymptotically approaching zero as the squeezing parameter increases. We also study the quadrature squeezing of the cavity mode and we show that a semiconductor microcavity can serve as a typical source of cavity mode squeezing, with the amount of squeezing significantly enhanced by the DOPO and the external squeezed field.
We investigate the quantum statistical properties of the light emitted by a quantum well interacting with squeezed light from a degenerate subthreshold optical parametric oscillator. We obtain analytical solutions for the pertinent quantum Langevin equations in the strong-coupling and low-excitation regimes. Using these solutions we calculate the intensity spectrum, autocorrelation function, and quadrature squeezing for the fluorescent light. We show that the fluorescent light exhibits bunching and quadrature squeezing. We also show that the squeezed light leads to narrowing of the width of the spectrum of the fluorescent light.
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The interaction between a squeezed vacuum and a semiconductor quantum dot microcavity is studied. The influence of this interaction on the photon statistics, one measurable quantity, is investigated in the presence of the electron–phonon interaction. When the system interacts with the squeezed vacuum, the non-classical features of the emitted photons are studied. It turns out that the photon counting statistics depend on the detuning and temperature. The emitted photons also exhibit non-classical features such as anti-bunching, and their non-classical features depend on the degree of squeezing. Moreover, it is found that the stronger the squeezed vacuum, the weaker the non-classical features in the photon counting statistics.