Journal
SCIENCE
Volume 325, Issue 5938, Pages 297-300Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1174488
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Funding
- Deutsche Forschungsgemeinschaft research group
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Quantum mechanically indistinguishable particles such as photons may show collective behavior. Therefore, an appropriate description of a light field must consider the properties of an assembly of photons instead of independent particles. We have studied multiphoton correlations up to fourth order in the single-mode emission of a semiconductor microcavity in the weak and strong coupling regimes. The counting statistics of single photons were recorded with picosecond time resolution, allowing quantitative measurement of the few-photon bunching inside light pulses. Our results show bunching behavior in the strong coupling case, which vanishes in the weak coupling regime as the cavity starts lasing. In particular, we verify the n factorial prediction for the zero-delay correlation function of n thermal light photons.
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