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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1994
DTSTART:20101209T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T092249Z
LAST-MODIFIED:20101129T135122Z
LOCATION:5310 Chamberlin
SUMMARY:Theory of Josephson photomultipliers: current biased Josephson
  junctions as microwave photon counters\, R. G. Herb Condensed Matter 
 Seminar\, Emily Pritchett\, Institute for Quantum Computing\, Universi
 ty of Waterloo
DESCRIPTION:Superconducting devices have enabled many experimental dem
 onstrations of on-chip quantum optics in the microwave regime.  While 
 microwave fields are usually detected by linear amplification\, detect
 ion of single low-energy microwave photons remains a challenge to expe
 rimental reproduction of quantum optical effects that require photon c
 ounting.  We analyze the use of single current biased Josephson juncti
 ons as Josephson photomultipliers (JPMs) for microwave photon counting
 .  By analyzing the backaction of a switching event in the junction\, 
 we show that JPMs are close to binary detectors responding only to the
  presence or absence of resonant photons.  We discuss applications of 
 a microwave photon counter\, including on-chip demonstration of the Ha
 nbury-Brown Twiss effect and efficient state tomography.
URL:https://www.physics.wisc.edu/events/?id=1994
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