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DTSTAMP:20260424T102111Z
UID:685d26af93a7d434745241@ist.ac.at
DTSTART:20250818T130000
DTEND:20250818T140000
DESCRIPTION:Speaker: Benjamin Huard\nhosted by Johannes Fink\nAbstract: Qub
 its are physical\, a quantum gate thus not only acts on the information ca
 rried by the qubit but also on its energy. What is then the corresponding 
 flow of energy between the qubit and the controller that implements the ga
 te? In this talk\, we exploit a superconducting platform to answer this qu
 estion in the case of a quantum gate realized by a resonant drive field. D
 uring the gate\, the superconducting qubit becomes entangled with the micr
 owave drive pulse so that there is a quantum superposition between energy 
 flows. We measure the energy change in the drive field conditioned on the 
 outcome of a projective qubit measurement. We demonstrate that the drive's
  energy change associated with the measurement backaction can exceed by fa
 r the energy that can be extracted by the qubit. This can be understood by
  considering the qubit as a weak measurement apparatus of the driving fiel
 d.  The second part of the talk discusses engines exploiting non-classical
  resources. While a handful of experiments have investigated the inner dyn
 amics of engines fueled by measurement backaction\, powering a useful task
  by such an engine is missing. Here we demonstrate the amplification of mi
 crowave signals by an engine fueled by repeated quantum measurements of a 
 superconducting transmon qubit. Using feedback\, the engine acts as a quan
 tum Maxwell demon operating without a hot thermal source. Measuring the ga
 in of this amplification constitutes a direct probing of the work output o
 f the engine\, in contrast with inferring the work by measuring the qubit 
 state along its evolution. Observing a good agreement between both work es
 timation methods\, our experiment validates the accuracy of the indirect m
 ethod.
LOCATION:Office Bldg West / Ground floor / Foyer seminar room (I21.EG.128)\
 , ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Benjamin Huard: Energetics of a resonantly driven transmon qubit: m
 easurement backaction and information fueled amplification
URL:https://talks-calendar.ista.ac.at/events/5906
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