Optical levitation of a microdroplet containing a single quantum dot.

  title={Optical levitation of a microdroplet containing a single quantum dot.},
  author={Yosuke Minowa and Ryoichi Kawai and Masaaki Ashida},
  journal={Optics letters},
  volume={40 6},
We demonstrate the optical levitation or trapping in helium gas of a single quantum dot (QD) within a liquid droplet. Bright single photon emission from the levitated QD in the droplet was observed for more than 200 s. The observed photon count rates are consistent with the value theoretically estimated from the two-photon-action cross section. This Letter presents the realization of an optically levitated solid-state quantum emitter. 

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