T W Lynn et al 2005 J. Opt. B: Quantum Semiclass. Opt. 7 S215 doi:10.1088/1464-4266/7/10/004
T W Lynn, K Birnbaum and H J Kimble
Show affiliationsRecent 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 favourably to open loop 'switching' analogues, 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.
42.50.Pq Cavity quantum electrodynamics; micromasers
42.50.Lc Quantum fluctuations, quantum noise, and quantum jumps
Issue 10 (October 2005)
Received 11 March 2005, accepted for publication 2 August 2005
Published 14 September 2005
T W Lynn et al 2005 J. Opt. B: Quantum Semiclass. Opt. 7 S215
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