Lattice of microtraps for ultracold atoms based on patterned magnetic films

Gerritsma, R.; Whitlock, S.; Fernholz, T.; Schlatter, H.; Luigjes, J.A.; Thiele, Jan-Ulrich; Goedkoop, J. B.; Spreeuw, R. J. C.

doi:10.1103/physreva.76.033408

Cited by 55 publications

(78 citation statements)

References 30 publications

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“…The surface is coated with a 100-nm gold layer and electrically isolated from the rest of the chip. The chip also features a permanent-magnet FePt layer that has been used to create arrays of microtraps [23,24], but this does not significantly influence the experiments discussed here. The atoms are cooled to temperatures of a few µK by forced evaporative cooling.…”

Section: Methodsmentioning

confidence: 99%

“…Interactions can be further enhanced and controlled in the presence of modest electric fields via Förster resonances [19] over distances of tens of micrometers [20][21][22]. We aim to employ Rydberg blockade to optically control interactions between atomic ensembles prepared in separate magnetic microtraps on a magnetic lattice atom chip [23,24]. Here, an unknown factor is the influence of the nearby metallic surface on the lifetime and coherence properties of the excited Rydberg atoms.…”

Section: Introductionmentioning

confidence: 99%

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Spatially resolved excitation of Rydberg atoms and surface effects on an atom chip

et al. 2010

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We demonstrate spatially resolved, coherent excitation of Rydberg atoms on an atom chip. Electromagnetically induced transparency (EIT) is used to investigate the properties of the Rydberg atoms near the gold-coated chip surface. We measure distance-dependent shifts (∼10 MHz) of the Rydberg energy levels caused by a spatially inhomogeneous electric field. The measured field strength and distance dependence is in agreement with a simple model for the electric field produced by a localized patch of Rb adsorbates deposited on the chip surface during experiments. The EIT resonances remain narrow (<4 MHz) and the observed widths are independent of atom-surface distance down to ∼20 µm, indicating relatively long lifetime of the Rydberg states. Our results open the way to studies of dipolar physics, collective excitations, quantum metrology, and quantum information processing involving interacting Rydberg excited atoms on atom chips.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatially resolved excitation of Rydberg atoms and surface effects on an atom chip

et al. 2010

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“…[13][14][15][16][17][18] We recently demonstrated an alternative technique to create two-dimensional neutral-atom lattices, based on a patterned film of magnetic iron-platinum (FePt) alloy on an atom chip. 19,20 This hybrid system combines the advantages of lithography techniques with cold atom experiments. Magnetic lattices offer unique opportunities that are in many ways complementary to those offered by the optical variety.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-film atom chip with 10 μm period lattices of microtraps for quantum information science with Rydberg atoms

Leung

Pijn

Schlatter

et al. 2014

Review of Scientific Instruments

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We describe the fabrication and construction of a setup for creating lattices of magnetic microtraps for ultracold atoms on an atom chip. The lattice is defined by lithographic patterning of a permanent magnetic film. Patterned magnetic-film atom chips enable a large variety of trapping geometries over a wide range of length scales. We demonstrate an atom chip with a lattice constant of 10 μm, suitable for experiments in quantum information science employing the interaction between atoms in highly excited Rydberg energy levels. The active trapping region contains lattice regions with square and hexagonal symmetry, with the two regions joined at an interface. A structure of macroscopic wires, cutout of a silver foil, was mounted under the atom chip in order to load ultracold 87 Rb atoms into the microtraps. We demonstrate loading of atoms into the square and hexagonal lattice sections simultaneously and show resolved imaging of individual lattice sites. Magnetic-film lattices on atom chips provide a versatile platform for experiments with ultracold atoms, in particular for quantum information science and quantum simulation. © 2014 AIP Publishing LLC.

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“…They are also well suited for tightly confining trapping potentials without the technical problems associated with high current densities. Furthermore, patterned permanent magnetic materials provide greater design freedom, allowing complex magnetic potentials to be realized such as ringshaped waveguides or large two-dimensional arrays of microtraps [15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Fully permanent magnet atom chip for Bose-Einstein condensation

et al. 2008

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We describe a proof-of-principle experiment on a fully permanent magnet atom chip. We study ultracold atoms and produce a Bose-Einstein condensate (BEC). The magnetic trap is loaded efficiently by adiabatic transport of a magnetic trap via the application of uniform external fields. Radio frequency spectroscopy is used for in-trap analysis and to determine the temperature of the atomic cloud. The formation of a Bose-Einstein condensate is observed in time-of-flight images and as a narrow peak appearing in the radio frequency spectrum.

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Lattice of microtraps for ultracold atoms based on patterned magnetic films

Cited by 55 publications

References 30 publications

Spatially resolved excitation of Rydberg atoms and surface effects on an atom chip

Spatially resolved excitation of Rydberg atoms and surface effects on an atom chip

Magnetic-film atom chip with 10 μm period lattices of microtraps for quantum information science with Rydberg atoms

Fully permanent magnet atom chip for Bose-Einstein condensation

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