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Two-color photon correlations of the light scattered by a quantum dot

M. Peiris, B. Petrak, K. Konthasinghe, Y. Yu, Z. C. Niu, and A. Muller
Phys. Rev. B 91, 195125 – Published 18 May 2015
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  • INTRODUCTION
  • EXPERIMENTAL SETUP
  • TWO-PHOTON SPECTRUM
  • THEORETICAL BACKGROUND
  • EFFECT OF DETUNING
  • INFLUENCE OF FILTER BANDWIDTH
  • CAUCHY-SCHWARZ INEQUALITY
  • CONCLUSION
  • ACKNOWLEDGMENTS
    • References

    Abstract

    Two-color second-order correlations of the light scattered near-resonantly by a quantum dot were measured by means of spectrally filtered coincidence detection. The effects of filter frequency and bandwidth were studied under monochromatic laser excitation, and a complete two-photon spectrum was reconstructed. The two-photon spectrum exhibits a rich structure associated with both real and virtual two-photon transitions down the “dressed states” ladder. Photon pairs generated via virtual transitions are found to violate the Cauchy-Schwarz inequality by a factor of 60. Our experiments are well described by the theoretical expressions obtained by del Valle et al. [Phys. Rev. Lett. 109, 183601 (2012)] via time- and normally-ordered correlation functions.

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    • Received 15 September 2014
    • Revised 24 April 2015

    DOI:https://doi.org/10.1103/PhysRevB.91.195125

    ©2015 American Physical Society

    Authors & Affiliations

    M. Peiris1, B. Petrak1, K. Konthasinghe1, Y. Yu2,3, Z. C. Niu2,3, and A. Muller1,*

    • 1Physics Department, University of South Florida, Tampa, Florida
    • 2State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China
    • 3Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, China

    • *mullera@usf.edu

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    Vol. 91, Iss. 19 — 15 May 2015

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    Images

    • Figure 1
      Figure 1

      (a) Experimental setup. (b) Unfiltered Mollow triplet for Ω/2π=1.3 GHz. (c) From top to bottom: isolated central peak, blue sideband, and red sideband (Γ/2π=0.5 GHz). (d) Experimental and theoretical TPS for the Rabi frequencies indicated, with filter bandwidths of Γ1/2π=Γ2/2π=0.5 GHz. (e) Experimental correlations for Ω/2π=2.2 GHz labeled by (ω1−ωL2π,ω2−ωL2π) in units of GHz. (f) Dressed-state diagram illustrating the transitions labeled in the middle theory panel of part (d).

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    • Figure 2
      Figure 2

      (a) Experimental and theoretical TPS under detuning δ/2π=1.0 GHz, with Ω/2π=1.6 GHz. (b) Experimental (black) and theoretical (red) photon correlations between red and blue sidebands (Ω/2π = 1.6 GHz) for different laser detunings (δ/2π=1.65,1.40,0.85,0.70,0.30, 0, −0.15,−0.45,−0.75,−1.20, and −1.50 GHz), offset for clarity with the shaded region indicating the zero. Inset: corresponding photon correlation measurements on both Mollow triplet sidebands for a range of detunings as indicated. (c) Experimental (black) and theoretical (red) photon correlations on the central Mollow triplet peak for a range of filter bandwidths (Γ1=Γ2=Γ) as indicated.

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    • Figure 3
      Figure 3

      (a) Map of the Cauchy-Schwarz criteria R with no laser detuning. (b) Same as in (a) but with a laser detuning of δ/2π=1.0 GHz.

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