Single photon emission from a single molecule
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- 作者：Treussart ; Franç ; ois ; Allé ; aume ; Romain ; Le Floc'h ; Vé ; ronique ; Roch ; Jean-Franç ; ois
- 关键词：single molecule spectroscopy ; nonclassical electromagnetic field state ; quantum cryptography ; dé ; tection de molé ; cules uniques ; é ; tat non classique du champ é ; lectromagné ; tique ; cryptographie quantique
- 刊名：Comptes Rendus Physique
- 出版年：2002
- 出版时间：2002
- 年：2002
- 卷：3
- 期：4
- 页码：501-508
- 全文大小：205 K
文摘
Photon emission from a single molecule at room temperature exhibits nonclassical features. Continuous wave fluorescence excitation provides antibunching in the emitted photons sequence as a signature of the property to only emit one photon at a time. A short pulsed excitation can then produce single photons on demand, with an overall quantum efficiency up to 4.5 % in our experimental setup. Direct measurement of the Mandel parameter Q(T) for an observation period of duration T follows a subpoissonian statistics on short time scale and superpoissonian statistics on longer time scale. The latter is attributed to blinking in the fluorescence due to the occurence of a metastable molecular triplet state. To cite this article: F. Treussart et al., C. R. Physique 3 (2002) 501–508.