Feedback control of a single atom in an optical cavity

Kubanek, Alexander; Koch, Markus; Sames, Christian; Ourjoumtsev, Alexei; Wilk, Tatjana; Pinkse, Pepijn W. H.; Rempe, Gerhard

doi:10.1007/s00340-011-4410-x

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…These experiments set the stage to include the atomic center-of-mass degrees of freedom and the optical forces in the cavity QED theory. In the following decade, the theoretical and experimental efforts resulted in an extension of the interaction time from the transit-time range of microseconds to the range of minutes (Figueroa et al, 2011;Kubanek et al, 2011).…”

Section: Single Atoms In a Cavitymentioning

confidence: 99%

“…The cavity field both provides particle detection and mediates the feedback force. This method has been successfully refined by several groups and resulted in an increase of singleparticle trapping times by several orders of magnitude (Kubanek et al, 2009(Kubanek et al, , 2011. By applying controlled and delayed feedback forces on the particle, its kinetic energy can be reduced as well.…”

Section: Monitoring and Feedback Controlmentioning

confidence: 99%

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Cold atoms in cavity-generated dynamical optical potentials

et al. 2013

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We review state-of-the-art theory and experiment of the motion of cold and ultracold atoms coupled to the radiation field within a high-finesse optical resonator in the dispersive regime of the atom-field interaction with small internal excitation. The optical dipole force on the atoms together with the back-action of atomic motion onto the light field gives rise to a complex nonlinear coupled dynamics. As the resonator constitutes an open driven and damped system, the dynamics is non-conservative and in general enables cooling and confining the motion of polarizable particles. In addition, the emitted cavity field allows for real-time monitoring of the particle's position with minimal perturbation up to sub-wavelength accuracy. For many-body systems, the resonator field mediates controllable long-range atom-atom interactions, which set the stage for collective phenomena. Besides correlated motion of distant particles, one finds critical behavior and non-equilibrium phase transitions between states of different atomic order in conjunction with superradiant light scattering. Quantum degenerate gases inside optical resonators can be used to emulate opto-mechanics as well as novel quantum phases like supersolids and spin glasses. Non-equilibrium quantum phase transitions, as predicted by e.g. the Dicke Hamiltonian, can be controlled and explored in real-time via monitoring the cavity field. In combination with optical lattices, the cavity field can be utilized for non-destructive probing Hubbard physics and tailoring long-range interactions for ultracold quantum systems.Comment: 55 page review pape

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Section: Single Atoms In a Cavitymentioning

confidence: 99%

Section: Monitoring and Feedback Controlmentioning

confidence: 99%

Cold atoms in cavity-generated dynamical optical potentials

et al. 2013

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“…56 122401:4 (a) An ultracold atom is entrained in an orbital motion before escaping[41]. In the past decades, the transittime is extended from the range of microseconds to the range of minutes with theoretical and experimental efforts[44,45]; (b) a schematic diagram of a 2.5 μm diameter pillar with 33 (26) bottom (top) mirror pairs, containing a single QD (left), and scanning electron microscope (SEM) image of a pillar microcavity (right)[46].…”

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confidence: 99%

On the developments and applications of optical microcavities: an overview

Wang

Cao

Wang

2013

Sci. China Inf. Sci.

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Devices based on the optical microcavities which confine light to small volumes by resonant recirculation are already indispensable for a wide range of studies and applications. This article provides an overview of the development and application of optical microcavities. We first give a pedagogical introduction to the interaction between a two-level system and a quantized electromagnetic field in the cavity, based on the so-called Jaynes-Cummings model, which is basic and important theory model in the cavity quantum electrodynamics, and various quantum phenomena and applications of it. Then, we overview three basic types of the microcavity structures, and also highlight the progress achieved so far in these systems. Based on these three structures, we give an account of three representative applications of optical microcavities, and explain their microcavity requirements and the state of the art for these devices, before outlining the challenges for the future.

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“…Feedback control leading to cooling was recently realized [11,12] with atoms strongly coupled to a high-finesse optical resonator. The method is successful at the single particle level in the strong coupling limit of cavity QED: The transmission of the optical resonator allows real-time monitoring of the atomic position and motional control via modulation of a trapping potential.…”

mentioning

confidence: 99%

“…A proposal by Balykin and Lethokhov [4] called a feedback method "information cooling" for motional control of atoms, emphasizing the close connection of information and control. Feedback control leading to cooling was recently realized [5,6] with atoms strongly coupled to a high-finesse optical resonator. The method is successful at the single particle level in the strong coupling limit of cavity-QED: The transmission of the optical resonator allows real-time monitoring of the atomic position and motional control via modulation of a trapping potential.…”

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confidence: 99%

Bayesian Feedback Control of a Two-Atom Spin-State in an Atom-Cavity System

et al. 2012

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We experimentally demonstrate real-time feedback control of the joint spin-state of two neutral cesium 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 loop achieves near optimal conditions by steering the system to the target state marginally exceeding the time to retrieve information about its state.

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Feedback control of a single atom in an optical cavity

Cited by 11 publications

References 24 publications

Cold atoms in cavity-generated dynamical optical potentials

Cold atoms in cavity-generated dynamical optical potentials

On the developments and applications of optical microcavities: an overview

Bayesian Feedback Control of a Two-Atom Spin-State in an Atom-Cavity System

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