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DTSTART:20260329T030000
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DTSTAMP:20260308T212000Z
UID:6993268eef1f6760206996@ist.ac.at
DTSTART:20260311T110000
DTEND:20260311T120000
DESCRIPTION:Speaker: Matthijs de Jong\nhosted by Johannes Fink\nAbstract: T
 he Casimir force follows from quantum fluctuations of the electromagnetic 
 field and yields a nonlinear attractive force between closely spaced condu
 ctive objects. Its magnitude depends on the conductivity of the objects up
  to optical frequencies. Measuring the Casimir force between superconducto
 rs should allow to isolate frequency-specific contributions to the Casimir
  effect\, as frequencies below the superconducting gap energy are expected
  to contribute differently than those above it. There is significant inter
 est in this contribution as it is suspected to contribute to an unexplaine
 d discrepancy between predictions and measurements of the Casimir force be
 tween normal metals\, which questions the basic principles on which estima
 tes of the magnitude are based. We have observed the Casimir force between
  superconducting objects through the nonlinear dynamics it imparts to a su
 perconducting drum resonator in a microwave optomechanical system. There i
 s excellent agreement between the experiment and Casimir force magnitude f
 or this device across three orders of magnitude of displacement. Furthermo
 re\, the Casimir nonlinearity is intense enough that\, with a modified des
 ign\, this device type should operate in the single-phonon nonlinear regim
 e. Accessing this regime has been a long-standing goal that would greatly 
 facilitate quantum operations of mechanical resonators.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Matthijs de Jong: Measurement of the Casimir force between supercon
 ductors
URL:https://talks-calendar.ista.ac.at/events/6294
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