Spectroscopic test of bose-einstein statistics for photons.
Using Bose-Einstein-statistics-forbidden two-photon excitation in atomic barium, we have limited the rate of statistics-violating transitions, as a fraction ν of an equivalent statistics-allowed transition rate, to ν<4.0×10{-11} at the 90% confidence level. This is an improvement of more than 3 orders of magnitude over the best previous result. Additionally, hyperfine-interaction enabling of the forbidden transition has been observed, to our knowledge, for the first time.
English
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Department of Physics, University of California, Berkeley, California 94720-7300, USA. denglish@berkeley.edu
Yashchuk
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Budker
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