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Quantum correlation among photons from a single quantum dot at room temperature

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Abstract

Maxwell's equations successfully describe the statistical properties1,2 of fluorescence from an ensemble of atoms or semiconductors in one or more dimensions. But quantization of the radiation field is required to explain the correlations of light generated by a single two-level quantum emitter, such as an atom, ion or single molecule3,4,5,6. The observation of photon antibunching in resonance fluorescence from a single atom unequivocally demonstrated the non-classical nature of radiation3. Here we report the experimental observation of photon antibunching from an artificial system—a single cadmium selenide quantum dot at room temperature. Apart from providing direct evidence for a solid-state non-classical light source, this result proves that a single quantum dot acts like an artificial atom, with a discrete anharmonic spectrum. In contrast, we find the photon-emission events from a cluster of several dots to be uncorrelated.

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Figure 1: Photoluminescence image of CdSe/ZnS nanocrystals on a glass plate.
Figure 2: Measured distribution n(τ) of photon pair separation times τ for a CdSe/ZnS cluster and a single quantum dot.
Figure 3: Time trace of photoluminescence intensity of a single CdSe/ZnS quantum dot on two different timescales.
Figure 4

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References

  1. Walls, D. F. & Milburn, G. J. Quantum Optics (Springer, Berlin, 1994).

    Book  Google Scholar 

  2. Hanbury-Brown, R. & Twiss, R. Q. Correlation between photons in two coherent beams of light. Nature 177, 27–29 (1956).

    Article  ADS  Google Scholar 

  3. Kimble, H. J., Dagenais, M. & Mandel, L. Photon antibunching in resonance fluorescence. Phys. Rev. Lett. 39, 691–694 (1977).

    Article  ADS  CAS  Google Scholar 

  4. Diedrich, F. & Walther, H. Nonclassical radiation of a single stored ion. Phys. Rev. Lett. 58, 203– 206 (1987).

    Article  ADS  CAS  Google Scholar 

  5. Basché, Th., Moerner, W. E., Orrit, M. & Talon, H. Photon antibunching in the fluorescence of a single dye molecule trapped in a solid. Phys. Rev. Lett. 69, 1516– 1519 (1992).

    Article  ADS  Google Scholar 

  6. Fleury, L., Segura, J.-M., Zumofen, G., Hecht, B., Wild, U. P. Nonclassical photon statistics in single-molecule fluorescence at room temperature. Phys. Rev. Lett. 84, 1148–1151 ( 2000).

    Article  ADS  CAS  Google Scholar 

  7. Nirmal, M. et al. Fluorescence intermittency in single cadmium selenide nanocrystals. Nature 383, 802–804 (1996).

    Article  ADS  CAS  Google Scholar 

  8. Empedocles, S. & Bawendi, M. G. Spectroscopy of single CdSe nanocrystallites. Acc. Chem. Res. 32, 389– 396 (1999).

    Article  CAS  Google Scholar 

  9. Klimov, V. I. & McBranch, D. W. Femtosecond 1P-to-1S electron relaxation in strongly confined semiconductor nanocrystals. Phys. Rev. Lett. 98, 4028–4031 (1998).

    Article  ADS  Google Scholar 

  10. Efros, Al. L. & Rosen, M. Random telegraph signal in the photoluminescence intensity of a single quantum dot. Phys. Rev. Lett. 78, 1110–1113 (1997).

    Article  ADS  CAS  Google Scholar 

  11. Murray, C. B., Norris, D. J. & Bawendi, M. G. Synthesis and characterization of nearly monodisperse CdE (E = S, Se, Te) semiconductor nanocrystallites. J. Am. Chem. Soc. 115, 8706–8715 ( 1993).

    Article  CAS  Google Scholar 

  12. Hines, M. A. & Guyot-Sionnest, P. Synthesis and characterization of strongly luminescing ZnS-capped CdSe nanocrystals. J. Phys. Chem. 100, 468–571 ( 1996).

    Article  CAS  Google Scholar 

  13. Dabbousi, B. O. et al. (CdSe)ZuS core shell quantum dots: synthesis and characterization of a size series of highly luminescent nanocrystallites. J. Phys. Chem. 101, 9463–9475 ( 1997).

    Article  CAS  Google Scholar 

  14. Nirmal, M. & Brus, L. Luminescence photophysics in semiconductor nanocrystals. Acc. Chem. Res. 32, 407– 414 (1999).

    Article  CAS  Google Scholar 

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Acknowledgements

This work is supported by the David and Lucile Packard Fellowship (A.I. and S.K.B.). P.M. acknowledges the financial support of the Max Kade Foundation.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, and Department of Physics, University of California, Santa Barbara, 93106, California, USA

    P. Michler & A. Imamoğlu

  2. Department of Chemistry and Biochemistry University of California, Santa Barbara, 93106, California, USA

    M. D. Mason, P. J. Carson, G. F. Strouse & S. K. Buratto

Authors
  1. P. Michler
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  2. A. Imamoğlu
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  3. M. D. Mason
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  4. P. J. Carson
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  5. G. F. Strouse
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  6. S. K. Buratto
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Correspondence to A. Imamoğlu.

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Michler, P., Imamoğlu, A., Mason, M. et al. Quantum correlation among photons from a single quantum dot at room temperature . Nature 406, 968–970 (2000). https://doi.org/10.1038/35023100

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