Microtrap arrays on magnetic film atom chips for quantum information science

Leung, Vanessa; Tauschinsky, Atreju; Druten, N. J. van; Spreeuw, R. J. C.

doi:10.1007/s11128-011-0295-1

Cited by 36 publications

(53 citation statements)

References 59 publications

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“…Nevertheless, we estimated in previous work that the microtraps will easily overcome the Van der Waals attraction to the surface. 24 While no longer compatible with Rydberg excitation, these lattices would push Hubbard models that are now studied in optical lattices into novel parameter regimes. 25,26 In particular, the tunneling rates and interaction energies will be greatly increased compared to optical lattices.…”

Section: Discussionmentioning

confidence: 99%

“…[21][22][23] a) Electronic mail: r.j.c.spreeuw@uva.nl They can be used to extend the range of length scales to both larger and smaller lattice parameters, each giving access to very different regimes of quantum simulation. 24 While smaller (∼100 nm) length scales could push Hubbard models into parameter regimes beyond what is now achievable using optical lattices, 25,26 in this paper we concentrate on the longer length scale.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

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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“…[7]. Moreover, magnetic nanopattern structures are promising candidates for a qubit realization in quantum informatics [8].…”

Section: )mentioning

confidence: 99%

CoPt/TiN films nanopatterned by RF plasma etching towards dot-patterned magnetic media

Szívós

Pothorszky

Šoltýs

et al. 2018

Applied Surface Science

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Applied Surface Science, because a novel and general (applicable to wide variety of material surfaces and thin films) nanopatterning technique proposed by the authors eariler, is applied here to successfully fabricate dot-patterned CoPt thin films exhibiting perpendicular magnetism. The manuscript topic fits nicely to the accommodated topics as it deals with 2D assembly and nanopatterning of sputter deposited magnetic CoPt thin films. Our results can be considered as a possibility to realize Bit Patterned Media (BPM). Thus, our paper should be of service for researchers interested in fabricating ordered nanopatterns, in particular perpendicular magnetic dot-patterned thin films. Moreover, the technique applied in this paper can easily be scaled to industrial throughput and it is relatively cheap.Cover Letter A C C E P T E D M A N U S C R I P T Highlights  A novel nanopatterning technique proposed recently is applied to CoPt thin films  CoPt films are transformed to L1 0 structure both before and after nanopatterning  Dot-patterned CoPt films with surface-perpendicular magnetic easy axis were obtained  Feature size can be reduced to <20nm and possible to scale to industrial throughput  Our work can be considered as a possibility to realize Bit Patterned Media (BPM) *Highlights (for review) Responses to the Editor and ReviewersEditor:The authors thank to Editor for the remarks. The format of the citations is changed to show all the authors and some more citations towards Applied Surface Science are added to the manuscript. The XRD scales in Figure 4 are corrected as well.Reviewer #1:The authors are thankful to Reviewer #1 for the useful comments and remarks. Here are our answers point-by-point: 1) Magnetic properties of the continues film is missing in current manuscript. I suggest add the in-plane and out-of-plane M-H loop to Fig. 8(a). So that the effect of dot geometry can be clearly observed.The magnetic properties of the annealed but non-patterned CoPt films are described in the authors' previous paper [1]. However, this fact was not mentioned in the in the "magnetic properties" section of the current manuscript. The previous paper was only cited in other sections of the current manuscript. For comparison, the VSM result of an annealed but nonpatterned CoPt film from our previous paper [1] is shown here together with the VSM Fig. 8(a) from the current manuscript. *Response to ReviewersAs it is seen, the two perpendicular measurements are very similar (besides the noise). The coercive force of the patterned sample seems to be somewhat larger, but this can't be stated due to the noise of the measurement. On the other hand, the in-plane hysteresis loop is way smaller in the case of the patterned sample. A few words about this comparison are added to the "magnetic properties section" of the current manuscript together with a citation to our previous paper.2) It will be good also compare the M-H loop before and after annealing. For both dot array and continuous film.For comparison, the Fig 8(a) of the manusc...

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“…The use of atom chips is also widespread for the study of Bose-Einstein condensates [9,28], degenerate Fermi gases [29] and gases in low dimensions [30,31]. Other experiments strive for the realization of quantum information processors [32][33][34]. The high sensitivity and micron-scale position control have been used for probing static magnetic [35] and electric [36] fields as well as microwaves [37].…”

Section: Introductionmentioning

confidence: 99%

Stability of a trapped-atom clock on a chip

et al. 2015

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We present a compact atomic clock interrogating ultracold 87 Rb magnetically trapped on an atom chip. Very long coherence times sustained by spin self-rephasing allow us to interrogate the atomic transition with 85% contrast at 5 s Ramsey time. The clock exhibits a fractional frequency stability of 5.8 × 10 −13 at 1 s and is likely to integrate into the 10 −15 range in less than a day. A detailed analysis of 7 noise sources explains the measured frequency stability. Fluctuations in the atom temperature (0.4 nK shot-to-shot) and in the offset magnetic field (5 × 10 −6 relative fluctuations shot-to-shot) are the main noise sources together with the local oscillator, which is degraded by the 30% duty cycle. The analysis suggests technical improvements to be implemented in a future second generation set-up. The results demonstrate the remarkable degree of technical control that can be reached in an atom chip experiment.

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Microtrap arrays on magnetic film atom chips for quantum information science

Cited by 36 publications

References 59 publications

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

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

CoPt/TiN films nanopatterned by RF plasma etching towards dot-patterned magnetic media

Stability of a trapped-atom clock on a chip

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