Strategies for Real-Time Position Control of a Single Atom in Cavity QED

Details Strategies for Real-Time Position Control of a Single Atom in Cavity QED Strategies for Real-Time Position Control of a Single Atom in Cavity QED

2005-07-07

arxiv.org/abs/quant-ph/0507064v1

Physics

Quantum Physics

12 pages, 10 figures, submitted to J. Opt. B Quant. Semiclass. Opt

Scientific paper

10.1088/1464-4266/7/10/004

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.

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