Výsledky vyhledávání - "Obrecht, J. M."

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Field-sensitive addressing and control of field-insensitive neutral-atom qubits

Autor: Lundblad, N., Obrecht, J. M., Spielman, I. B., Porto, J. V.

The establishment of a scalable scheme for quantum computing with addressable and long-lived qubits would be a scientific watershed, harnessing the laws of quantum physics to solve classically intractable problems. The design of many proposed quantum

Externí odkaz: http://arxiv.org/abs/0902.3213

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Measuring Electric Fields From Surface Contaminants with Neutral Atoms

Autor: Obrecht, J. M., Wild, R. J., Cornell, E. A.

Publikováno v: Phys. Rev. A 75, 062903 (2007)

In this paper we demonstrate a technique of utilizing magnetically trapped neutral Rb-87 atoms to measure the magnitude and direction of stray electric fields emanating from surface contaminants. We apply an alternating external electric field that a

Externí odkaz: http://arxiv.org/abs/0705.2027

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Measurement of the Temperature Dependence of the Casimir-Polder Force

Autor: Obrecht, J. M., Wild, R. J., Antezza, M., Pitaevskii, L. P., Stringari, S., Cornell, E. A.

Publikováno v: Phys. Rev. Lett. 98, 063201 (2007)

We report on the first measurement of a temperature dependence of the Casimir-Polder force. This measurement was obtained by positioning a nearly pure 87-Rb Bose-Einstein condensate a few microns from a dielectric substrate and exciting its dipole os

Externí odkaz: http://arxiv.org/abs/physics/0608074

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Measurement of the Casimir-Polder force through center-of-mass oscillations of a Bose-Einstein condensate

Autor: Harber, D. M., Obrecht, J. M., McGuirk, J. M., Cornell, E. A.

Publikováno v: Phys.Rev.A72:033610,2005

We have performed a measurement of the Casimir-Polder force using a magnetically trapped 87-Rb Bose-Einstein condensate. By detecting perturbations of the frequency of center-of-mass oscillations of the condensate perpendicular to the surface, we are

Externí odkaz: http://arxiv.org/abs/cond-mat/0506208

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Alkali adsorbate polarization on conducting and insulating surfaces probed with Bose-Einstein condensates

Autor: McGuirk, J. M., Harber, D. M., Obrecht, J. M., Cornell, E. A.

A magnetically trapped 87Rb Bose-Einstein condensate is used as a sensitive probe of short-range electrical forces. In particular, the electric polarization of, and the subsequent electric field generated by, 87Rb adsorbates on conducting and insulat

Externí odkaz: http://arxiv.org/abs/cond-mat/0403254

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Thermally Induced Losses in Ultra-Cold Atoms Magnetically Trapped Near Room-Temperature Surfaces

Autor: Harber, D. M., McGuirk, J. M., Obrecht, J. M., Cornell, E. A.

We have measured magnetic trap lifetimes of ultra-cold Rb87 atoms at distances of 5-1000 microns from surfaces of conducting metals with varying resistivity. Good agreement is found with a theoretical model for losses arising from near-field magnetic

Externí odkaz: http://arxiv.org/abs/cond-mat/0307546

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Einfluss von Betonzusatzmitteln auf die Energieund CO2-Bilanz von Beton

Autor: Obrecht, J.-M, Gälli, R., Zimmermann, P., Fallscheer, F.

The energy consumption and the C02 emissions during the production of two different concrete mixes with identical concrete properties were compared. The two concrete samples were prepared with and without the addition of a superplasticizer. Less ener

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od_______805::0a1bb1932b41947710d53038b6e2d810
http://doc.rero.ch/record/293676/files/rbm-1997-5208.pdf

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