Tunable axial potentials for atom-chip waveguides

Stickney, James; Imhof, Eric; Kasch, Brian; Kroese, Bethany; Crow, Jonathon; Olson, Spencer E.; Squires, Matthew B.

doi:10.1103/physreva.96.053606

Cited by 7 publications

(14 citation statements)

References 42 publications

(120 reference statements)

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“…The new atom chip experiments are described in Ref. [8]. These experiments do not require BEC but rather atoms evaporatively cooled to 1 − 4 µK.…”

Section: Resultsmentioning

confidence: 99%

“…b.) The top layer (black) of the cross wire trap chip consists of wire pairs used to make a controllable polynomial magnetic potential [8]. The wire pattern on the front side of the chip (dark gray) was used for making a four wire waveguide.…”

Section: Constructionmentioning

confidence: 99%

“…trap frequencies > 2 kHz) were still possible, while external mounting of the chips enabled rapid and simple switching of atom chips without impacting the UHV environment. Production of a Bose-Einstein condensate (BEC) using ex vacuo atom chips, as well as trapping atoms in precision atom-chip magnetic potentials [8] were demonstrated. In comparison to other atom-chip systems [3,[9][10][11][12], the atom chips were switched multiple times without breaking vacuum.…”

Section: Introductionmentioning

confidence: 99%

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Ex vacuo atom chip Bose-Einstein condensate

Squires

Olson

Kasch

et al. 2016

Applied Physics Letters

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Ex vacuo atom chips, used in conjunction with a custom thin walled vacuum chamber, have enabled the rapid replacement of atom chips for magnetically trapped cold atom experiments. Atoms were trapped in > 2 kHz magnetic traps created using high power atom chips. The thin walled vacuum chamber allowed the atoms to be trapped < ∼ 1 mm from the atom chip conductors which were located outside of the vacuum system. Placing the atom chip outside of the vacuum simplified the electrical connections and improved thermal management. Using a multi-lead Z-wire chip design, a Bose-Einstein condensate was produced with an external atom chip. Vacuum and optical conditions were maintained while replacing the Z-wire chip with a newly designed cross-wire chip. The atom chips were exchanged and an initial magnetic trap was achieved in less than three hours.

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“…The new atom chip experiments are described in Ref. [8]. These experiments do not require BEC but rather atoms evaporatively cooled to 1 − 4 µK.…”

Section: Resultsmentioning

confidence: 99%

Section: Constructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ex vacuo atom chip Bose-Einstein condensate

Squires

Olson

Kasch

et al. 2016

Applied Physics Letters

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“…Following the prescription of [19], we assume that the potential is separable, i.e., V(r r r) = V(x) + V ⊥ (r ⊥ ), and the k-vectors of the laser beams point in the x-direction. Collisions are neglected as we have previously analyzed the effects of collisions in a similar interferometer and do not expect atom-atom collisions to have a significant impact on the results [20].…”

Section: The Modelmentioning

confidence: 99%

“…Recent research has demonstrated a high degree of control over the residual field [19]. Here, we analyze the effect of a controlled residual potential in a Talbot-Lau interferometer with a gas of cold, thermal atoms using a Wigner function approach.…”

Section: Introductionmentioning

confidence: 99%

A Wigner Function Approach to Coherence in a Talbot-Lau Interferometer

Imhof

Stickney

Squires

2016

Atoms

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Abstract:Using a thermal gas, we model the signal of a trapped interferometer. This interferometer uses two short laser pulses, separated by time T, which act as a phase grating for the matter waves. Near time 2T, there is an echo in the cloud's density due to the Talbot-Lau effect. Our model uses the Wigner function approach and includes a weak residual harmonic trap. The analysis shows that the residual potential limits the interferometer's visibility, shifts the echo time of the interferometer, and alters its time dependence. Loss of visibility can be mitigated by optimizing the initial trap frequency just before the interferometer cycle begins.

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Interference properties of a trapped atom interferometer in two asymmetric optical dipole traps*

Wang¹,

Li²,

Wang³

et al. 2020

Chinese Phys. B

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We investigate interference properties of a trapped atom interferometer where two symmetric optical dipole traps (ODTs) act as the atomic wave-packets splitter and combiner with internal state labelling. After the preparation of initial superposition states, the atomic wave-packet is adiabatically split and moves into two spatially separate asymmetric ODTs. The atomic wave-packets in two ODTs are then adiabatically recombined after a duration of free evolving in traps, completing the interference cycle of this atom interferometer. We show that the interferogram exhibits a series of periodic revivals in interference visibility. Furthermore, the revival period decreases as the asymmetry of two dipole potentials increases. By introducing an echo sequence to the interferometer, we show that while the echo effect is not influenced by the asymmetry of the two ODTs, the onset of periodic revivals changes by the echo sequence. Our study provides an effective method to cancel or compensate the phase shift caused by position and time correlated force.

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Tunable axial potentials for atom-chip waveguides

Cited by 7 publications

References 42 publications

Ex vacuo atom chip Bose-Einstein condensate

Ex vacuo atom chip Bose-Einstein condensate

A Wigner Function Approach to Coherence in a Talbot-Lau Interferometer

Interference properties of a trapped atom interferometer in two asymmetric optical dipole traps*

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