Efficient rapid production of a Bose-Einstein condensate by overcoming serious three-body loss

TL;DR

This paper demonstrates an efficient method to rapidly produce large Bose-Einstein condensates of rubidium-87 by optimizing radio-frequency sweeps during evaporative cooling, overcoming significant three-body loss.

Contribution

It introduces a rapid radio-frequency sweep technique that significantly improves condensate production efficiency and aligns experimental results with quantum kinetic theory predictions.

Findings

Achieved a condensate with over 2 million atoms.

Optimized the RF sweep rate to enhance cooling efficiency.

Experimental results agree with quantum kinetic theory calculations.

Abstract

We report the efficient production of a large Bose-Einstein condensate in $^{87}$Rb atoms. This is achieved by quickly reducing the radio-frequency of the magnetic field at a rate of -96.8 kHz/s during the final stage of evaporative cooling, and we have produced a condensate with ${(2.2 \pm 0.1) \times 10^{6}}$ atoms against a serious three-body recombination loss. We observed the dependence of the cooling efficiency on the rate at which the truncated energy changes by measuring the condensate growth for three kinds of radio-frequency sweep. The experimental results quantitatively agree with calculations based on the quantum kinetic theory of a Bose gas.