Cooling a Bose gas by three-body losses

Abstract

We report the first demonstration of cooling by three-body losses in a Bose gas. We use a harmonically confined one-dimensional (1D) Bose gas in the quasi-condensate regime and, as the atom number decreases under the effect of three-body losses, the temperature $T$ drops up to a factor four. The ratio $k_{B}T/(m{c}^2)$ stays close to 0.64, where $m$ is the atomic mass and $c$ the sound speed in the trap center. The dimensionless 1D interaction parameter $\gamma$, evaluated at the trap center, spans more than two order of magnitudes over the different sets of data. We present a theoretical analysis for a homogeneous 1D gas in the quasi-condensate regime, which predicts that the ratio $k_{B}T/(m{c}^2)$ converges towards 0.6 under the effect of three-body losses. More sophisticated theoretical predictions that take into account the longitudinal harmonic confinement and transverse effects are in agreement within 30% with experimental data.

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• Asymptotic temperature of a lossy condensate
• Universality and two-body losses: lessons from the effective non-Hermitian dynamics of two particles
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• Cooling a Fermi gas with three-body recombination near a narrow Feshbach resonance
• Eightfold way to dark states in SU(3) cold gases with two-body losses
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• Multichromatic Floquet engineering of quantum dissipation
• Adiabatic Quantum Zeno Dynamics of Bosonic Atom Pairs with Large Inelastic Losses
• Emulating non-Hermitian dynamics in a finite non-dissipative quantum system
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