Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 7: Superconductivity: Cryodetectors
TT 7.9: Vortrag
Montag, 31. März 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 Koelle1 — 1Physikalisches 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.