Bose-Einstein-condensate interferometer with macroscopic arm separation

Garcia, Oscar Viyuela; Deissler, B.; Hughes, K. J.; Reeves, J. M.; Sackett, C. A.

doi:10.1103/physreva.74.031601

Cited by 79 publications

(99 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recent experiments using Bose condensates [8] have shown that the external state coherence can be preserved for approximately 200 ms, where the decoherence is dominated by atom-atom interactions. Interferometry experiments using either condensed atoms in a weak trap or noncondensate atoms in a waveguide with precise angular alignments have been shown to have phase-stable interrogation times of ≈50 ms, where the dephasing is induced by inhomogeneities in the confining potential [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Atom interferometry using wave packets with constant spatial displacements

Prentiss

2010

Phys. Rev. A

View full text Add to dashboard Cite

A standing-wave light-pulse sequence is demonstrated that places atoms into a superposition of wave packets with precisely controlled displacements that remain constant for times as long as 1 s. The separated wave packets are subsequently recombined, resulting in atom interference patterns that probe energy differences of ≈10 −34 J and can provide acceleration measurements that are insensitive to platform vibrations.

show abstract

Section: Introductionmentioning

confidence: 99%

Atom interferometry using wave packets with constant spatial displacements

Prentiss

2010

Phys. Rev. A

View full text Add to dashboard Cite

show abstract

“…If the gas is cooled below the recoil temperature and is split using a laser pulse, a large relative separation between each arm of the interferometer can be achieved [6]. By exposing the atoms in each arm to a different environment, precision measurements of localized phenomena can be performed.…”

Section: Introductionmentioning

confidence: 99%

“…Several groups have built trapped atom interferometers using atomic gases that are both above and below the recoil temperature [4,5,6,7,8,9]. To date, all interferomters that use gases below the recoil temperature have utilized atoms in a nearly pure Bose-Einstein condensate (BEC).…”

Section: Introductionmentioning

confidence: 99%

Collisional decoherence in trapped-atom interferometers that use nondegenerate sources

Stickney¹,

Squires²,

Scoville³

et al. 2009

Phys. Rev. A

View full text Add to dashboard Cite

The coherence time, and thus sensitivity, of trapped atom interferometers that use nondegenerate gases are limited by the collisions between the atoms. An analytic model that describes the effects of collisions between atoms in an interferometer is developed. It is then applied to an interferometer using a harmonically trapped non-degenerate atomic gas that is manipulated with a single set of standing wave laser pulses. The model is used to find the optimal operating conditions of the interferometer and direct Monte-Carlo simulation of the interferometer is used to verify the analytic model.

show abstract

“…Seminal examples of atom interferometry followed soon after the first BEC was produced [33,34], including Ketterle's two-condensate experiment, followed more recently by a compact realisation on an atom chip [35]. Large-area interferometers with BEC have also been realised [36], with atom interferometer sensitivities to phase shifts scaling linearly with the enclosed area.…”

Section: Bose-condensed Gasesmentioning

confidence: 99%

Creation and applications of large toroidal time-averaged optical potentials for BECs

Glidden¹

View full text Add to dashboard Cite

This thesis reports the final stages of construction and performance of a high atom number rubidium-87 Bose-Einstein condensate (BEC) apparatus, and the generation of timeaveraged optical potentials geared towards interferometric applications. A detailed description of the hybrid trap used in our experiment is given, which comprises magnetic confinement from a quadrupole field, and optical trapping from a focussed 1064 nm laser beam. We present the typical temperatures of atom clouds at all stages of cooling, from the 3D magneto-optical trap, through to the onset of condensation in the hybrid trap.Our trap typically realises nearly-pure BECs of 1.5-2.0 × 10 6 atoms, at temperatures of (217 ± 6) nK, over duty cycles of 16-25 s.The implementation of a time-averaged optical potential is also discussed, as a means of generating versatile, planar potentials for BECs. In this work, we focus on the generation of large, ring-shaped potentials, which have trapping frequencies in the ranges 2π × (110-140, 35-55) Hz vertically and radially, respectively. The details of a feedforward algorithm are presented, which allows for the realisation of smooth ring structures up to 150 µm in radius, which enclose areas ten times larger than optical ring traps created previously. These larger rings are promising candidates for interferometric measurements of the rotation-induced Sagnac phase, with the device sensitivity proportional to the enclosed area. We typically retain 2.5-3.0 × 10 6 atoms in these large traps, after evaporatively cooling to temperatures of (44 ± 9) nK. The measured lifetimes in the trap are on the order of 16 s.These ring condensates are expected to be fully phase coherent, despite their reduced dimensionality, as a result of high atom numbers, weak confinement, and low temperatures. We present preliminary data demonstrating these coherence properties, and outlay future plans for a comprehensive study of this coherence, probing both fully coherent rings, and those expected to fall within the phase-fluctuating regime.The control afforded using our time-averaged optical potentials is demonstrated through the generation of acoustic waves propagating around the ring condensates. The dispersion is linear for low driving frequencies, and allows for a determination of the speed of Publications included in this thesisNo publications included. Contributions by others to this thesisThe experimental data presented in Figure 5.18 were collected and analysed by ThomasBell. In addition, a number of CAD renderings of the apparatus shown in chapter 4 were also his work. Appropriate mention has been made in the captions of relevant figures. Statement of parts of thesis submitted to qualify for the award of another degreeNone. To the other experimentalists in the lab, both on my experiment, and on the other side:Guillaume Gauthier, and Nick McKay Parry -thanks for your input and advice along the way. To Tom Bell, who has spent many a late night fixing electronics, upgrading essential components of the experiment, as well...

show abstract

Bose-Einstein-condensate interferometer with macroscopic arm separation

Cited by 79 publications

References 28 publications

Atom interferometry using wave packets with constant spatial displacements

Atom interferometry using wave packets with constant spatial displacements

Collisional decoherence in trapped-atom interferometers that use nondegenerate sources

Creation and applications of large toroidal time-averaged optical potentials for BECs

Contact Info

Product

Resources

About