arXiv:2012.01280 · Physical Review X

Tracking Evaporative Cooling of a Mesoscopic Atomic Quantum Gas in Real Time

Johannes Zeiher, Julian Wolf, Joshua Isaacs, Jonathan Kohler, Dan Stamper-Kurn

Published Oct 25, 2021• 21 citations

Abstract

Continuously tracking the number of atoms in an evaporating ultracold quantum gas uncovers stochastic fluctuations, providing a platform for exploring the interplay between randomness and nonlinear dynamics.

DOI: 10.1103/physrevx.11.041017

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arXiv:2012.01280 · Physical Review X

Tracking Evaporative Cooling of a Mesoscopic Atomic Quantum Gas in Real Time

Johannes Zeiher, Julian Wolf, Joshua Isaacs, Jonathan Kohler, Dan Stamper-Kurn

Published Oct 25, 2021• 21 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physrevx.11.041017

Related papers

Tracking evaporative cooling of an atomic quantum gas in real time

Johannes Zeiher

Bulletin of the American Physical SocietyMar 17, 20210 citations

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Ryan Wilkinson

The temperature dependence of so-called p-wave interactions in an ultracold atomic gas has been measured for the first time.

PhysicsJan 8, 20260 citations

Stabilization of the number of Bose-Einstein-condensed atoms in evaporative cooling via three-body recombination loss

Makoto Yamashita, T. Mukai

The dynamics of evaporative cooling of magnetically trapped ${}^{87}\mathrm{Rb}$ atoms is studied on the basis of the quantum kinetic theory of a Bose gas. We carried out the quantitative calculations of the time evolution of conventional evaporative cooling where the frequency of the radio-frequency magnetic field is swept exponentially. This ``exponential-sweep cooling'' is known to become inefficient at the final stage of the cooling process due to a serious three-body recombination loss. We precisely examine how the growth of a Bose-Einstein condensate depends on the experimental parameters of evaporative cooling, such as the initial number of trapped atoms, the initial temperature, and the bias field of a magnetic trap. It is shown that three-body recombination drastically depletes the trapped ${}^{87}\mathrm{Rb}$ atoms as the system approaches the quantum degenerate region and the number of condensed atoms finally becomes insensitive to these experimental parameters. This result indicates that the final number of condensed atoms is well stabilized by a large nonlinear three-body loss against the fluctuations of experimental conditions in evaporative cooling.The dynamics of evaporative cooling of magnetically trapped ${}^{87}\mathrm{Rb}$ atoms is studied on the basis of the quantum kinetic theory of a Bose gas. We carried out the quantitative calculations of the time evolution of conventional evaporative cooling where the frequency of the radio-frequency magnetic field is swept exponentially. This ``exponential-sweep cooling'' is known to become inefficient at the final stage of the cooling process due to a serious three-body recombination loss. We precisely examine how the growth of a Bose-Einstein condensate depends on the experimental parameters of evaporative cooling, such as the initial number of trapped atoms, the initial temperature, and the bias field of a magnetic trap. It is shown that three-body recombination drastically depletes the trapped ${}^{87}\mathrm{Rb}$ atoms as the system approaches the quantum degenerate region and the number of condensed atoms finally becomes insensitive to these experimental parameters. This result indicates that the final number of condensed atoms is well stabilized by a large nonlinear three-body loss against the fluctuations of experimental conditions in evaporative cooling.

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The dynamics of evaporative cooling of magnetically trapped 87 Rb atoms is studied on the basis of the quantum kinetic theory of a Bose gas. The theoretical optimization of the cooling trajectory clarifies that the acceleration of evaporative cooling around the transition point of Bose-Einstein condensation is very effective against serious three-body recombination loss. The number of condensed atoms is expected to be largely enhanced by the optimization as compared with the typical value produced by the conventional evaporative cooling, where the frequency of the radio-frequency magnetic field is swept exponentially. Next, we precisely examine how the growth of a condensate depends on the experimental parameters of evaporative cooling in this inefficient exponential-sweep cooling. We find that, due to large nonlinear three-body loss, the number of condensed atoms finally becomes insensitive to the initial number of trapped atoms, the initial temperature, and the bias field of a magnetic trap. This result opens up the experimental possibility that the final number of condensed atoms can be well stabilized against the shot-to-shot fluctuations of experimental conditions in evaporative cooling.The dynamics of evaporative cooling of magnetically trapped 87 Rb atoms is studied on the basis of the quantum kinetic theory of a Bose gas. The theoretical optimization of the cooling trajectory clarifies that the acceleration of evaporative cooling around the transition point of Bose-Einstein condensation is very effective against serious three-body recombination loss. The number of condensed atoms is expected to be largely enhanced by the optimization as compared with the typical value produced by the conventional evaporative cooling, where the frequency of the radio-frequency magnetic field is swept exponentially. Next, we precisely examine how the growth of a condensate depends on the experimental parameters of evaporative cooling in this inefficient exponential-sweep cooling. We find that, due to large nonlinear three-body loss, the number of condensed atoms finally becomes insensitive to the initial number of trapped atoms, the initial temperature, and the bias field of a magnetic trap. This result opens up the experimental possibility that the final number of condensed atoms can be well stabilized against the shot-to-shot fluctuations of experimental conditions in evaporative cooling.

Laser PhysicsJan 1, 20040 citations

The dynamics of evaporative cooling of magnetically trapped

{}^{87}\mathrm{Rb}

atoms is studied on the basis of the quantum kinetic theory of a Bose gas. We carried out the quantitative calculations of the time evolution of conventional evaporative cooling where the frequency of the radio-frequency magnetic field is swept exponentially. This ``exponential-sweep cooling'' is known to become inefficient at the final stage of the cooling process due to a serious three-body recombination loss. We precisely examine how the growth of a Bose-Einstein condensate depends on the experimental parameters of evaporative cooling, such as the initial number of trapped atoms, the initial temperature, and the bias field of a magnetic trap. It is shown that three-body recombination drastically depletes the trapped

{}^{87}\mathrm{Rb}

atoms as the system approaches the quantum degenerate region and the number of condensed atoms finally becomes insensitive to these experimental parameters. This result indicates that the final number of condensed atoms is well stabilized by a large nonlinear three-body loss against the fluctuations of experimental conditions in evaporative cooling.