Extended Data Fig. 1: Time-of-flight (TOF) data of the atomic cloud after release from the dipole trap. | Nature Physics

Extended Data Fig. 1: Time-of-flight (TOF) data of the atomic cloud after release from the dipole trap.

From: Buffer gas cooling of a trapped ion to the quantum regime

Extended Data Fig. 1

We plot \({\sigma }_{{\rm{x}}}\) (blue) and \({\sigma }_{{\rm{y}}}\) (yellow). We average the temperature \({T}_{{\rm{x}}}\) and \({T}_{{\rm{y}}}\) to determine the atom temperature \({T}_{{\rm{a}}}\) a, TOF data for cold atoms after a buffer gas cooling time of 1 s. We determine an average atom temperature of \({T}_{{\rm{a}}}\) = 2.0(0.8) μK. The error bars are quite large for this measurement as the atomic density is at the lower limit of what we can reliably measure in our system. b, TOF data for cold atoms before the buffer gas cooling. We determine \({T}_{{\rm{a}}}\) = 2.6(0.3) μK. c, TOF data for the atomic cloud used for the spin-exchange rate measurement, we determine a temperature of \({T}_{{\rm{a}}}\) = 11.6(0.5) μK. Error bars denote standard deviations of fitted cloud sizes.

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