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Journal of Physics Conference Series

Nonlinear polarization optical response to entangled state of biexciton

TETSUYA TSUJI, Goro Oohata, K Mizoguchi

Published May 1, 2019• 0 citations
Publisher

Abstract

Abstract We have investigated the nonlinear optical responses of biexcitons which show the polarization entanglement by using pump-probe spectroscopy. Measuring all polarization combinations of pump-probe signals and precise analysis using the idea of quantum tomography enable us to extract the specific property of the entanglement. The obtained results indicate the two kinds of the third-order nonlinear response, namely the photo-induced absorption and the optical Kerr effect. From the analysis with the optical Kerr effect signals, the polarization correlations of the optical responses are clearly derived.

DOI
10.1088/1742-6596/1220/1/012032

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Abstract We have investigated the nonlinear optical responses of biexcitons which show the polarization entanglement by using pump-probe spectroscopy. Measuring all polarization combinations of pump-probe signals and precise analysis using the idea of quantum tomography enable us to extract the specific property of the entanglement. The obtained results indicate the two kinds of the third-order nonlinear response, namely the photo-induced absorption and the optical Kerr effect. From the analysis with the optical Kerr effect signals, the polarization correlations of the optical responses are clearly derived.
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We report on large optical nonlinear effects induced by coherent interactions between excitons and biexcitons in quantum dots. The absorption spectra in an exciton–biexciton system are measured in InGaAs quantum dots by using single dot spectroscopy. The spectra exhibit unusual shapes that have a transparent region under a strong excitation condition. A pump–probe measurement ensures that the exciton state is erased by a quantum interference effect with exciton and biexciton photoabsorption processes. These results suggest that optical functions such as electromagnetically induced transparency are feasible with excitons and biexcitons in quantum dots.
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Abstract Based on the light-induced polarization ellipse rotation effect, we propose an optical Kerr gate (OKG) in which elliptically polarized probe light is used by introducing a pair of crossed quarter-wave plates into the conventional OKG arrangement, placed just before and after the Kerr medium. Transient birefringence induced by the pump beam in the Kerr medium leads to a rotation of the polarization ellipse of the probe beam, hence part of the probe beam would pass through the OKG. Theoretical calculations and experimental results both indicate that the OKG signal intensity would reach the optimum value independent of the pump polarization direction when the probe beam is circularly polarized. This modified OKG measurement is suitable to detect the third-order nonlinearities induced in anisotropic materials.