Transport of launched cold atoms with a laser guide and pulsed magnetic fields

Pritchard, Matthew J; Arnold, Aidan S.; Cornish, Simon L.; Hallwood, David W.; Pleasant, Chris V S; Hughes, Ifan G.

doi:10.1088/1367-2630/8/12/309

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…The controlled transport of atoms is a key ingredient in many experimental platforms dedicated to quantum engineering. Neutral atoms have been transported as thermal atomic clouds [9][10][11], condensates [12,13], or individually [14,15], using magnetic or optical traps. Transport of ions with electromagnetic traps has also been achieved recently [16,17].…”

Section: Introductionmentioning

confidence: 99%

Fast manipulation of Bose–Einstein condensates with an atom chip

et al. 2018

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We present a detailed theoretical analysis of the implementation of shortcut-to-adiabaticity protocols for the fast transport of neutral atoms with atom chips. The objective is to engineer transport ramps with durations not exceeding a few hundred milliseconds to provide metrologically relevant input states for an atomic sensor. Aided by numerical simulations of the classical and quantum dynamics, we study the behavior of a Bose-Einstein condensate in an atom chip setup with realistic anharmonic trapping. We detail the implementation of fast and controlled transports over large distances of several millimeters, i.e. distances 1000 times larger than the size of the atomic cloud. A subsequent optimized release and collimation step demonstrates the capability of our transport method to generate ensembles of quantum gases with expansion speeds in the picokelvin regime. The performance of this procedure is analyzed in terms of collective excitations reflected in residual center of mass and size oscillations of the condensate. We further evaluate the robustness of the protocol against experimental imperfections.

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Section: Introductionmentioning

confidence: 99%

Fast manipulation of Bose–Einstein condensates with an atom chip

et al. 2018

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“…However, in contrast to this work, there is no significant increase in cloud size with the two magnetic transport schemes described above. The combination of pulsed magnetic focusing combined with laser guiding also looks promising [32].…”

Section: Discussionmentioning

confidence: 99%

Experimental single-impulse magnetic focusing of launched cold atoms

Smith¹,

Arnold²,

Pritchard³

et al. 2008

J. Phys. B: At. Mol. Opt. Phys.

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Single-impulse three-dimensional magnetic focusing of vertically launched cold atoms has been observed. Four different configurations of the lens were used to vary the relative radial and axial focusing properties. Compact focused clouds of 85 Rb were seen for all four configurations. It is shown that an atom-optical ray matrix approach for describing the lensing action is insufficient. Numerical simulation using a full approximation to the lens's magnetic field shows very good agreement with the radial focusing properties of the lens. However, the axial (vertical direction) focusing properties are less well described and the reasons for this are discussed.

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“…By combining the magneto-optical trap (MOT) with a far-off resonance potential trap, an atomic fountain was guided by a far-off resonance laser in 1999 [ 8 ]. In general, the process of atom guiding actually includes two steps; the first step involves transferring cold atoms from an MOT to a dipole trap, and the second consists of guiding the transferred atoms for certain distances [ 9 ]. The following studies were conducted to investigate the relative parameters to improve the efficiency of initially transferred atoms in the optical dipole potential, such as the intensity and detuning of the laser beam [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Influence of the Laser Beam Waist on Cold Atom Guiding Efficiency

Song

et al. 2018

Sensors

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The primary purpose of this study is to investigate the influence of the vertical guiding laser beam waist on cold atom guiding efficiency. In this study, a double magneto-optical trap (MOT) apparatus is used. With an unbalanced force in the horizontal direction, a cold atomic beam is generated by the first MOT. The cold atoms enter the second chamber and are then re-trapped and cooled by the second MOT. By releasing a second atom cloud, the process of transferring the cold atoms from MOT to the dipole trap, which is formed by a red-detuned converged 1064-nm laser, is experimentally demonstrated. And after releasing for 20 ms, the atom cloud is guided to a distance of approximately 3 mm. As indicated by the results, the guiding efficiency depends strongly on the laser beam waist; the efficiency reaches a maximum when the waist radius (w0) of the laser is in the range of 15 to 25 μm, while the initial atom cloud has a radius of 133 μm. Additionally, the properties of the atoms inside the dipole potential trap, such as the distribution profile and lifetime, are deduced from the fluorescence images.

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Transport of launched cold atoms with a laser guide and pulsed magnetic fields

Cited by 7 publications

References 41 publications

Fast manipulation of Bose–Einstein condensates with an atom chip

Fast manipulation of Bose–Einstein condensates with an atom chip

Experimental single-impulse magnetic focusing of launched cold atoms

Experimental Investigation of the Influence of the Laser Beam Waist on Cold Atom Guiding Efficiency

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