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Feedback control of a single atom in an optical cavity

Alexander Kubanek, M. Koch, Christian Sames +4 more

Applied Physics BFeb 11, 201112 citations

Ground-state cooling of a single atom at the center of an optical cavity

Stephan Ritter, Andreas Reiserer, Christian N olleke +1 more

Bulletin of the American Physical SocietyJun 4, 20136 citations

Parametric feedback cooling of a single atom inside an optical cavity

Tatjana Wilk, Christian Sames, Haytham Chibani +4 more

This paper demonstrates an efficient parametric feedback cooling of a single atom held in an intra-cavity standing wave dipole trap. In contrast to previous feedback strategies, this scheme cools the fast axial oscillation of the atom as well as the slower radial motion. In order to cool the system with this method, the modulation of the trap depth must be adjusted in amplitude and phase with respect to the atomic motion in real time to counteract it.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)May 1, 20130 citations

Continuous parametric feedback cooling of a single atom in an optical cavity

Christian Sames, Christoph Hamsen, Haytham Chibani +3 more

We demonstrate a feedback algorithm to cool a single neutral atom trapped inside a standing-wave optical cavity. The algorithm is based on parametric modulation of the confining potential at twice the natural oscillation frequency of the atom, in combination with fast and repetitive atomic position measurements. The latter serve to continuously adjust the modulation phase to a value for which parametric excitation of the atomic motion is avoided. Cooling is limited by the measurement backaction which decoheres the atomic motion after only a few oscillations. Nonetheless, applying this feedback scheme to an $\ensuremath{\sim}5$-kHz oscillation mode increases the average storage time of a single atom in the cavity by a factor of 60 to more than 2 s. In contrast to previous feedback schemes, our algorithm is also capable of cooling a much faster $\ensuremath{\sim}500$-kHz oscillation mode within just microseconds. This demonstrates that parametric cooling is a powerful technique that can be applied in all experiments where optical access is limited.We demonstrate a feedback algorithm to cool a single neutral atom trapped inside a standing-wave optical cavity. The algorithm is based on parametric modulation of the confining potential at twice the natural oscillation frequency of the atom, in combination with fast and repetitive atomic position measurements. The latter serve to continuously adjust the modulation phase to a value for which parametric excitation of the atomic motion is avoided. Cooling is limited by the measurement backaction which decoheres the atomic motion after only a few oscillations. Nonetheless, applying this feedback scheme to an $\ensuremath{\sim}5$-kHz oscillation mode increases the average storage time of a single atom in the cavity by a factor of 60 to more than 2 s. In contrast to previous feedback schemes, our algorithm is also capable of cooling a much faster $\ensuremath{\sim}500$-kHz oscillation mode within just microseconds. This demonstrates that parametric cooling is a powerful technique that can be applied in all experiments where optical access is limited.

arXiv:1805.00241Physical Review AMay 8, 20185 citations

Cooling and Cooperative Coupling of Single Atoms in an Optical Cavity

Mathematisch-naturwissenschaftlichen Fakultät I, Rheinischen Friedrich-Wilhelms-Universität Bonn

Jan 1, 20140 citations

Cavity cooling of atoms: Within and without a cavity

André Xuereb, P. Domokos, Péter Horák +1 more

We compare the efficiencies of two optical cooling schemes, where a single particle is either inside or outside an optical cavity, under experimentally-realisable conditions. We evaluate the cooling forces using the general solution of a transfer matrix method for a moving scatterer inside a general one-dimensional system composed of immobile optical elements. Assuming the same atomic saturation parameter, we find that the two cooling schemes provide cooling forces and equilibrium temperatures of comparable magnitude.We compare the efficiencies of two optical cooling schemes, where a single particle is either inside or outside an optical cavity, under experimentally-realisable conditions. We evaluate the cooling forces using the general solution of a transfer matrix method for a moving scatterer inside a general one-dimensional system composed of immobile optical elements. Assuming the same atomic saturation parameter, we find that the two cooling schemes provide cooling forces and equilibrium temperatures of comparable magnitude.

Jan 5, 20113 citations

Parametric feedback cooling of a single atom inside an optical cavity

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