Single Cs atoms as collisional probes in a large Rb magneto-optical trap

Weber, C.; John, Shincy; Spethmann, Nicolas; Meschede, Dieter; Widera, Artur

doi:10.1103/physreva.82.042722

Cited by 19 publications

(21 citation statements)

References 24 publications

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“…After it has been sufficiently cooled down to be well localized in the dipole trap crossing region, the Cs MOT is switched on. To avoid immediate losses of the single Cs atoms due to light-induced collisions [38][39][40], both species are trapped in different traps with a displacement of 110 µm. Figure II As an initial step towards immersing the Cs atoms into the Rb BEC, we immerse them into a thermal Rb gas.…”

Section: Combining Single Atoms With the Quantum Gasmentioning

confidence: 99%

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Hohmann

Kindermann

Gänger

et al. 2015

EPJ Quantum Technol.

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We present an experimental system to study the Bose polaron by immersion of single, wellcontrollable neutral Cs impurities into a Rb Bose-Einstein condensate (BEC). We show that, by proper optical traps, independent control over impurity and BEC allows for precision relative positioning of the two sub-systems as well as for independent read-out. We furthermore estimate that measuring the polaron binding energy of Fröhlich-type Bose polarons in the low and intermediate coupling regime is feasible with our experimental constraints and limitations discussed.

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Section: Combining Single Atoms With the Quantum Gasmentioning

confidence: 99%

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Hohmann

Kindermann

Gänger

et al. 2015

EPJ Quantum Technol.

Self Cite

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“…In these, two separate, ultracold atomic systems are combined in such a way that their coupling can be externally controlled and their states independently measured, thus allowing detailed investigations into the theory of quantum interactions and decoherence. Existing examples of such systems are single spin impurities embedded in ultracold Fermi gases [2,3] and the combination of neutral [4][5][6][7][8] or charged single atoms [9,10] with Bose-Einstein condensates. These experiments offer the possibility for controlled simulation of many different system-environment models synonymous with condensedmatter physics and nonequilibrium statistical physics [11].…”

Section: Introductionmentioning

confidence: 99%

Orthogonality catastrophe as a consequence of qubit embedding in an ultracold Fermi gas

et al. 2011

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We investigate the behavior of a two-level atom coupled to a one dimensional, ultra-cold Fermi gas. The sudden switching on of the impurity-gas scattering leads to the loss of any coherence in the initial state of the impurity and we show that the exact dynamics of this process is strongly influenced by the effect of the orthogonality catastrophe within the gas. We highlight the relationship between the Loschmidt echo and the retarded Green's function -typically used to formulate the dynamical theory of the catastrophe -and demonstrate that the effect is reflected in the impurity dynamics. The expected broadening of the spectral function can be observed using Ramsey interferometry on the two level atom.

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“…Studying the transport of a Bose gas after imparting a momentum on it using a magnetic field [18] or tilting the lattice [21] has allowed experimentalists to successfully reveal signatures of phase transitions or determine excitation spectra, respectively. Recently an impurity has been used in experiments as a coherent probe for large quantum systems in order to extract impurity-boson collision parameters [22] and interaction strengths [23].…”

Section: Introductionmentioning

confidence: 99%

Impurity transport through a strongly interacting bosonic quantum gas

et al. 2011

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Using near-exact numerical simulations we study the propagation of an impurity through a onedimensional Bose lattice gas for varying bosonic interaction strengths and filling factors at zero temperature. The impurity is coupled to the Bose gas and confined to a separate tilted lattice. The precise nature of the transport of the impurity is specific to the excitation spectrum of the Bose gas which allows one to measure properties of the Bose gas non-destructively, in principle, by observing the impurity; here we focus on the spatial and momentum distributions of the impurity as well as its reduced density matrix. For instance we show it is possible to determine whether the Bose gas is commensurately filled as well as the bandwidth and gap in its excitation spectrum. Moreover, we show that the impurity acts as a witness to the cross-over of its environment from the weakly to the strongly interacting regime, i.e., from a superfluid to a Mott insulator or TonksGirardeau lattice gas and the effects on the impurity in both of these strongly-interacting regimes are clearly distinguishable. Finally, we find that the spatial coherence of the impurity is related to its propagation through the Bose gas, giving an experimentally controllable example of noise-enhanced quantum transport.

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Single Cs atoms as collisional probes in a large Rb magneto-optical trap

Cited by 19 publications

References 24 publications

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Orthogonality catastrophe as a consequence of qubit embedding in an ultracold Fermi gas

Impurity transport through a strongly interacting bosonic quantum gas

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