Published in
American Physical Society, Physical Review Letters, 25(104), 2010
DOI: 10.1103/physrevlett.104.253604
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Spectroscopic Test of Bose-Einstein Statistics for Photons
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Abstract
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${}<4.0\ifmmode\times\else×\fi{}{10}^{$-${}11}$ 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.