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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: Superconductivity: Cryodetectors

TT 7.9: Talk

Monday, March 31, 2014, 12:00–12:15, HSZ 03

Dc SQUIDs for the detection of Bose-Einstein-Condensates — •Matthias Rudolph1, Michael Merker2, Johannes Maximilian Meckbach2, Martin Knufinke1, Petra Vergien1, Florian Jessen1, Simon Bell1, Patrizia Weiß1, Helge Hattermann1, Konstantin Ilin2, Michael Siegel2, József Fortágh1, Reinhold Kleiner1, and Dieter Koelle11Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, Auf der Morgenstelle 14,D-72076 Tübingen, Germany — 2Institut für Mikro- und Nanoelektronische Systeme, Karlsruhe Institute of Technology, Hertzstr. 16, D-76187 Karlsruhe, Germany

One example of an exciting quantum hybrid system is created by coupling a SQUID with an ensemble of ultra cold atoms. Here we suggest using a gradiometric dc SQUID to non-destructively detect the center of mass motion of Bose-Einstein Condensates (BECs) which are confined in a magnetic trap. The Gradiometer, fabricated using a self-aligning Nb/AlOx/Nb process, has been characterized with respect to its transport and noise properties at a temperature of T=4.2 K, revealing an equivalent density of flux noise SΦ1/2≈ 350 nΦ0/Hz1/2 in a magnetically unshielded environment. Numerical simulations based on the London equations suggest that with these noise properties we can expect to detect a rubidium BEC with 105 atoms at a distance of 10 µm from the SQUID with a signal-to-noise ratio SNR ≈ 10.

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