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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2347
DTSTART:20120206T223000Z
DURATION:PT1H0M0S
DTSTAMP:20260313T050858Z
LAST-MODIFIED:20120130T141148Z
LOCATION:5310 Chamberlin
SUMMARY:Quantum efficiency of a microwave photon detector based on a c
 urrent-biased Josephson junction\, Condensed Matter Theory Group Semin
 ar\, Amrit Poudel\, UW-Madison
DESCRIPTION: We analyze the quantum efficiency of a microwave photon d
 etector based on a current-biased Josephson junction. We consider the 
 Jaynes-Cummings Hamiltonian to describe coupling between the photon fi
 eld and the junction. We then take into account coupling of the juncti
 on and the resonator to the environment. We solve the equation of moti
 on of the density matrix of the resonator-junction system to compute t
 he quantum efficiency of the detector as a function of detection time\
 , bias current\, and energy relaxation time. Our results indicate that
  junctions with modest coherence properties can provide efficient dete
 ction of single microwave photons\, with quantum efficiency in excess 
 of 80%.  
URL:https://www.physics.wisc.edu/events/?id=2347
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