An ideal probe should be as small as possible so it doesn't interfere with the observation. When measuring the distribution of a light field, it seems that a single atom is up to the job.
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27 March 2018
This article was initially published with an incorrect DOI. A new DOI has been assigned and registered at Crossref, and has been corrected in the article.
References
Guthöhrlein, G. R., Keller, M., Hayasaka, H., Lange, W. & Walther, H. Nature 414, 49–51 (2001).
Eschner, J., Raab, Ch., Schmidt-Kaler, F. & Blatt, R. Nature 413, 495–498 (2001).
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Steane, A. The atomic nanoscope. Nature 414, 24–25 (2001). https://doi.org/10.1038/35102129z
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DOI: https://doi.org/10.1038/35102129z