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Photon Blocking

  1. Jul 8, 2005 #1
    Is here:http://arxiv.org/abs/quant-ph/0507065

    sister paper here:http://arxiv.org/abs/quant-ph/0507064

    Abstract:Recent realizations of single-atom trapping and tracking in cavity QED open the door for feedback schemes which actively stabilize the motion of a single atom in real time. We present feedback algorithms for cooling the radial component of motion for a single atom trapped by strong coupling to single-photon fields in an optical cavity. Performance of various algorithms is studied through simulations of single-atom trajectories, with full dynamical and measurement noise included. Closed loop feedback algorithms compare favorably to open-loop "switching" analogs, demonstrating the importance of applying actual position information in real time. The high optical information rate in current experiments enables real-time tracking that approaches the standard quantum limit for broadband position measurements, suggesting that realistic active feedback schemes may reach a regime where measurement backaction appreciably alters the motional dynamics.

    very..very interesting :rolleyes:
  2. jcsd
  3. Jul 11, 2005 #2
    Here is more from Nature:http://www.nature.com/nphys/journal/vaop/nprelaunch/full/nphys001.html
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