Bayesian feedback control of a two-atom spin-state in an atom-cavity system.

  title={Bayesian feedback control of a two-atom spin-state in an atom-cavity system.},
  author={Stefan Brakhane and Wolfgang Alt and Tobias Kampschulte and Miguel Martinez-Dorantes and Ren{\'e} Reimann and Seokchan Yoon and Artur Widera and Dieter Meschede},
  journal={Physical review letters},
  volume={109 17},
We experimentally demonstrate real-time feedback control of the joint spin-state of two neutral cesium atoms inside a high finesse optical cavity. The quantum states are discriminated by their different cavity transmission levels. A Bayesian update formalism is used to estimate state occupation probabilities as well as transition rates. We stabilize the balanced two-atom mixed state, which is deterministically inaccessible, via feedback control and find very good agreement with Monte Carlo… 

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