Dissipative Distillation of Supercritical Quantum Gases

Muñoz, Jorge Mellado; Xi, Wang; Hewitt, Thomas E.; Kowalczyk, Anna; Sawant, Rahul; Barontini, Giovanni

doi:10.1103/physrevlett.125.020403

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…For the simulations, we consider bath temperatures in the range 0.1 µK-10 µK, and the atomic density in the bath to be ∼10 12 cm −3 . These parameters can be produced in current experimental setups [13]. For the interspecies scattering length that sets the strength of the interaction between the trapped atom and the bath, we have chosen a = 160a 0 , which can be achieved exploiting one of the KRb heteronuclear Feshbach resonances [14].…”

Section: Resultsmentioning

confidence: 99%

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Thermalization of a Trapped Single Atom with an Atomic Thermal Bath

2021

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We studied a single atom trapped in an optical tweezer interacting with a thermal bath of ultracold atoms of a different species. Because of the collisions between the trapped atom and the bath atoms, the trapped atom undergoes changes in its vibrational states occupation to reach thermal equilibrium with the bath. By using Monte Carlo simulations, we characterized the single atom’s thermalization process, and we studied how this can be used for cooling. Our simulations demonstrate that, within known experimental limitations, it is feasible to cool a trapped single atom with a thermal bath.

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Section: Resultsmentioning

confidence: 99%

“…Besides the implementation of single atom quantum engines, this kind of system is a promising approach to studying out-of-equilibrium physics [13]. The system studied here could be modified to obtain a pristine realization of several instances of the spin-boson model or other open quantum system models like the Caldeira-Leggett model [16].…”

Section: Discussionmentioning

confidence: 99%

Thermalization of a Trapped Single Atom with an Atomic Thermal Bath

2021

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“…Our experimental sequence starts by loading Rb atoms from a dark magneto-optical trap (MOT) in a crossed dipole trap [42]. The atoms are initially pumped in the |F = 1⟩ ground state manifold.…”

Section: Realization Of a K Quantum Impurity In A Rb Thermal Bathmentioning

confidence: 99%

Controlling the interactions in a cold atom quantum impurity system

Hewitt,

Bertheas,

Jain

et al. 2024

Quantum Sci. Technol.

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We implement an experimental architecture in which a single atom of K is trapped in an optical tweezer, and is immersed in a bath of Rb atoms at ultralow temperatures. In this regime, the motion of the single trapped atom is confined to the lowest quantum vibrational levels. This realizes an elementary and fully controllable quantum impurity system. For the trapping of the K atom, we use a species-selective dipole potential, that allows us to independently manipulate the quantum impurity and the bath. We concentrate on the characterization and control of the interactions between the two subsystems. To this end, we perform Feshbach spectroscopy, detecting several inter-dimensional confinement-induced Feshbach resonances for the KRb interspecies scattering length, that parametrizes the strength of the interactions. We compare our data to a theory for inter-dimensional scattering, finding good agreement. Notably, we also detect a series of p-wave resonances stemming from the underlying free-space s-wave interactions. We further determine how the resonances behave as the temperature of the bath and the dimensionality of the interactions change. Additionally, we are able to screen the quantum impurity from the bath by finely tuning the wavelength of the light that produces the optical tweezer, providing us with a new effective tool to control and minimize the interactions. Our results open a range of new possibilities in quantum simulations of quantum impurity models, quantum information, and quantum thermodynamics, where the interactions between a quantized system and the bath is a powerful yet largely underutilized resource.

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“…We now apply our Bayesian framework on actual experimental data. Details on our experimental setup can be found in [54]. In this work, 41 K atoms are loaded into an optical tweezer from a dark magneto-optical trap.…”

Section: Experimental Realisation a The Experimental Setupmentioning

confidence: 99%

Optimal cold atom thermometry using adaptive Bayesian strategies

Glatthard¹,

Rubio²,

Sawant³

et al. 2022

Preprint

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Precise temperature measurements on systems of few ultracold atoms is of paramount importance in quantum technology, but can be very resource-intensive. Here, we put forward an adaptive Bayesian framework that substantially boosts the performance of cold atom temperature estimation. Specifically, we process data from release-recapture thermometry experiments on few potassium atoms cooled down to the microkelvin range in an optical tweezer. We demonstrate that adaptively choosing the release-recapture times to maximise information gain does substantially reduce the number of measurements needed for the estimate to converge to a final reading. Unlike conventional methods, our proposal systematically avoids capturing and processing uninformative measurements. Furthermore, we are able to produce much more reliable estimates, especially when the measured data are scarce and noisy. Likewise, the resulting estimates converge faster to the real temperature in the asymptotic limit. Our method can be adapted to enhance the precision and resource-efficiency of many other techniques running on different experimental setups, thus opening new avenues in quantum thermometry.

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Dissipative Distillation of Supercritical Quantum Gases

Cited by 5 publications

References 36 publications

Thermalization of a Trapped Single Atom with an Atomic Thermal Bath

Thermalization of a Trapped Single Atom with an Atomic Thermal Bath

Controlling the interactions in a cold atom quantum impurity system

Optimal cold atom thermometry using adaptive Bayesian strategies

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