@article{2012-brakhane-meschede-phys-rev-lett-v109-p173601, Abstract = {

We experimentally demonstrate real-time feedback control of the joint spin-state of two neutral Caesium 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 simulations. On average, the feedback loops achieves near optimal conditions by steering the system to the target state marginally exceeding the time to retrieve information about its state.

}, Author = {Brakhane, S. AND Alt, W. AND Kampschulte, T. AND Martinez-Dorantes, M. AND Reimann, R. AND Yoon, S. AND Widera, A. AND Meschede, D.}, Journal = {Phys. Rev. Lett.}, Pages = {173601}, Title = {{Bayesian Feedback Control of a Two-Atom Spin-State in an Atom-Cavity System}}, Volume = {109}, Year = {2012} }