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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3831
DTSTART:20151106T170000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T110838Z
LAST-MODIFIED:20151029T200817Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Meissner qubit - characterization and vortex-probing applicati
 ons\, R. G. Herb Condensed Matter Seminar\, Jaseung Ku \, University o
 f Illinois- Urbana Champaign
DESCRIPTION:I will present a new type of transmon split-junction qubit
  which can be tuned by Meissner screening currents in the adjacent sup
 erconducting film electrodes. The best detected relaxation time (T1) w
 as of the order of 50 us and the dephasing time (T2) about 40 us. The 
 achieved period of oscillation with magnetic field was much smaller th
 an in usual SQUID-based transmon qubits\, thus a strong effective fiel
 d amplification has been realized. This Meissner qubit allows an effic
 ient coupling to superconducting vortices. I will present a quantitati
 ve analysis of the radiation-free energy relaxation in qubits coupled 
 to Abrikosov vortices. The observation of coherent quantum oscillation
 s provides evidence that vortices can exist in coherent quantum superp
 ositions of different position states. According to our suggested mode
 l\, the wave function collapse is defined by Caldeira-Leggett dissipat
 ion associated with viscous motion of the vortex cores.
URL:https://www.physics.wisc.edu/events/?id=3831
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