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TZID:Europe/Vienna
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DTSTART:20180325T030000
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DTSTART:20171029T020000
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BEGIN:VEVENT
DTSTAMP:20260424T125200Z
UID:5a2006dec9233898158952@ist.ac.at
DTSTART:20171205T110000
DTEND:20171205T123000
DESCRIPTION:Speaker: Lisa Arndt\nhosted by Johannes Fink\nAbstract: Measure
 ment of Bloch oscillations in a single Josephson junction in the phase sli
 p regime is a crucial element of metrology that links the current to the f
 requency standard. Bloch oscillations can be measured by applying a period
 ic drive to a DC-biased Josephson junction. Phase-locking between the two 
 oscillations then gives rise to dual Shapiro steps. Unlike the normal Shap
 iro steps\, a measurement of these dual Shapiro steps is impeded by parasi
 tic capacitances. These parasitic capacitances can be screened by an on-ch
 ip superinductance. However\, as the system is constantly driven\, the ene
 rgy has to be dissipated. To that end\, we propose to add an additional la
 rge off-chip resistance. We investigate the resulting system by a set of a
 nalytical and numerical methods. We show that even in the presence of para
 sitic capacitances\, it is possible to observe Bloch oscillations with rea
 l- istic system parameters. In particular\, we show that the leading effec
 t of the parasitic capacitance is a reduction of the critical voltage of t
 he phase slip junction by a factor of exp(-10kO/Z) where Z is the characte
 ristic impedance formed by the parasitic capacitance and the superinductan
 ce.
LOCATION:Seminar Room\, Lab Building East\, ISTA
ORGANIZER:jdeanton@ist.ac.at
SUMMARY:Lisa Arndt: Effect of parasitic capacitances on Bloch oscillations 
 measured via dual Shapiro steps
URL:https://talks-calendar.ista.ac.at/events/983
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