Observation of intensity squeezing in resonance fluorescence from a solid-state device
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Intensity squeezing i.e. photon number fluctuations below the shot noise limit is a fundamental aspect of quantum optics and has wide applications in quantum metrology. It was predicted in 1979 that the intensity squeezing could be observed in resonance fluorescence from a two-level quantum system. Yet, its experimental observation in solid states was hindered by inefficiencies in generating, collecting and detecting resonance fluorescence. Here, we report the intensity squeezing in a single-mode fibre-coupled resonance fluorescence single-photon source based on a quantum dot-micropillar system. We detect pulsed single-photon streams with 22.6% system efficiency, which show subshot-noise intensity fluctuation with an intensity squeezing of . We estimate a corrected squeezing of at the first lens. The observed intensity squeezing provides the last piece of the fundamental picture of resonance fluorescence; which can be used as a new standard for optical radiation and in scalable quantum metrology with indistinguishable single photons.
Wang , H , Qin , J , Chen , S , Chen , M-C , You , X , Ding , X , Huo , Y-H , Yu , Y , Schneider , C , Höfling , S , Sully , M , Lu , C-Y & Pan , J-W 2020 , ' Observation of intensity squeezing in resonance fluorescence from a solid-state device ' , Physical Review Letters , vol. 125 , no. 15 . https://doi.org/10.1103/PhysRevLett.125.153601
Physical Review Letters
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