Reconstruction of a Cold Atom Cloud by Magnetic Focusing

Saba, C. V.; Barton, P. A.; Boshier, M. G.; Hughes, Ifan G.; Rosenbusch, P.; Sauer, B. E.; Hinds, E. A.

doi:10.1103/physrevlett.82.468

Cited by 77 publications

(57 citation statements)

References 22 publications

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“…The reflection of atoms with relatively high kinetic energy has been demonstrated using steep potentials realised with evanescent waves [282,283,284,285,286,287] and periodic magnetic surfaces [288,289,290,291,292,293,294,295,296,297,298]. These elements however critically depend on their surface roughness, which often hinders a purely specular reflection.…”

Section: Mirrors and Beamsplittersmentioning

confidence: 99%

Physics with coherent matter waves

Bongs¹,

Sengstock²

2004

Rep. Prog. Phys.

176

190

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Abstract. This review discusses progress in the new field of coherent matter waves, in particular with respect to Bose-Einstein condensates. We give a short introduction to Bose-Einstein condensation and the theoretical description of the condensate wavefunction. We concentrate on the coherence properties of this new type of matter wave as a basis for fundamental physics and applications. The main part of this review treats various measurements and concepts in the physics with coherent matter waves. In particular we present phase manipulation methods, atom lasers, nonlinear atom optics, optical elements, interferometry and physics in optical lattices. We give an overview of the state of the art in the respective fields and discuss achievements and challenges for the future. § To whom correspondence should be addressed (sengstock@physnet.uni-hamburg.de) Physics with coherent matter waves 2

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Section: Mirrors and Beamsplittersmentioning

confidence: 99%

Physics with coherent matter waves

Bongs¹,

Sengstock²

2004

Rep. Prog. Phys.

176

190

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“…This second idea is attractive because there is no power dissipation in a permanent magnet and because very tight atom traps with oscillation frequencies of ∼ 1 MHz (10 nm ground state size) are possible [7]. Previous studies have used audiotape [8], floppy disks [9,10], videotape [11], magnetic and magneto-optical films [7,12,13], and hard disks [14]. Until recently, permanently magnetized films were used only for mm-or cm-scale manipulation of atom clouds by reflection, but now cold atom clouds have been loaded into the microtraps [12,15].…”

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confidence: 99%

Bose-Einstein condensation on a permanent-magnet atom chip

et al. 2005

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We have produced a Bose-Einstein condensate on a permanent-magnet atom chip based on periodically magnetized videotape. We observe the expansion and dynamics of the condensate in one of the microscopic waveguides close to the surface. The lifetime for atoms to remain trapped near this dielectric material is significantly longer than above a metal surface of the same thickness. These results illustrate the suitability of microscopic permanent-magnet structures for quantum-coherent preparation and manipulation of cold atoms.PACS numbers: 03.75. Kk, 34.50.Dy, 39.25.+K, 03.75.Be Atom chips are making rapid progress in the quantumcoherent manipulation of microscopic cold atom clouds [1,2,3] with a view to fundamental studies of quantum gases [4], interferometry [5], and quantum information processing [6]. Small-scale magnetic field patterns for atom chips can be made using either microfabricated current-carrying wires or microscopic structures of permanent magnetization. This second idea is attractive because there is no power dissipation in a permanent magnet and because very tight atom traps with oscillation frequencies of ∼ 1 MHz (10 nm ground state size) are possible [7]. Previous studies have used audiotape [8], floppy disks [9, 10], videotape [11], magnetic and magneto-optical films [7,12,13], and hard disks [14]. Until recently, permanently magnetized films were used only for mm-or cm-scale manipulation of atom clouds by reflection, but now cold atom clouds have been loaded into the microtraps [12,15]. For many applications of these magnetic microtraps, the next significant step is to prepare a Bose-Einstein condensate (BEC) on the chip as a source of coherent matter waves for interferometry or as a low-entropy reservoir for quantum information processing.In this paper we describe the production of a BEC on a permanent-magnet atom chip made from videotape, which forms an array of waveguides. We have observed the propagation of the BEC along one of these guides. With the ends of the guide closed, we study center-ofmass and length oscillations of the trapped gas, demonstrating that the videotape chip is a practical way to manipulate cold atoms. We also show that the spin relaxation time of the trapped atoms is significantly longer above the dielectric surface of the videotape than above a metal surface of the same thickness. soidal pattern of magnetization written along the length of the videotape (x direction) with the form M 0 cos(kx)x, as illustrated in Fig. 1. This produces a field (B x , B y ) = B sur e −ky (− cos(kx), sin(kx)),where B sur is the field strength at the surface (y = 0). The waveguides appear, as shown at the top of Fig. 1, when a bias field B bias is added in the x-y plane. Near the center of each guide, the magnetic field has a quadrupole structure with a gradient of field strength given by B ′ = kB bias . An axial bias B z prevents the total field from going to zero at the center. For small-amplitude transverse oscillations this makes a harmonic trap with frequencywhere µ B g F m F is t...

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“…These include audiotape [1], floppy disks [2,3,4], videotape [5,6], magneto-optical films [7,8,9], and hard disks [10]. Using standard lithographic techniques, it is also possible to make small patterns of current carrying wires for the same purpose [11,12].…”

Section: Introductionmentioning

confidence: 99%

Cold atoms in videotape micro-traps

Sinclair¹,

Retter²,

Curtis³

et al. 2005

Eur. Phys. J. D

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We describe an array of microscopic atom traps formed by a pattern of magnetisation on a piece of videotape. We describe the way in which cold atoms are loaded into one of these micro-traps and how the trapped atom cloud is used to explore the properties of the trap. Evaporative cooling in the micro-trap down to a temperature of 1 µK allows us to probe the smoothness of the trapping potential and reveals some inhomogeneity produced by the magnetic film. We discuss future prospects for atom chips based on microscopic permanent-magnet structures.

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Reconstruction of a Cold Atom Cloud by Magnetic Focusing

Cited by 77 publications

References 22 publications

Physics with coherent matter waves

Physics with coherent matter waves

Bose-Einstein condensation on a permanent-magnet atom chip

Cold atoms in videotape micro-traps

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