BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3362
DTSTART:20140612T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T175348Z
LAST-MODIFIED:20140610T193943Z
LOCATION:Chamberlin 5310
SUMMARY:Efficient Qubit Readout Using Josephson Photomultipliers\, R. 
 G. Herb Condensed Matter Seminar\, Luke C.G. Govia\, Univ des Saarland
 es
DESCRIPTION:A Josephson photomultplier (JPM) can absorb and detect wea
 k microwave signals with high sensitivity (PRL 107\, 217401 (2011)). W
 hen strongly coupled to a microwave cavity\, the JPM can detect single
  microwave photons with large bandwidth and with near unit efficiency 
 (PRB 86\, 174506 (2012)). The switching of a JPM into its measured sta
 te acts on the adjacent cavity via the back action of photon subtracti
 on (PRA 86\, 032311 (2012)). While a destructive measurement of the mi
 crowave cavity\, this switching can perform a binary non-demolition me
 asurement of a quantum system coupled to the cavity. We present a prot
 ocol by which the presence and subsequent detection of a cavity photon
  by a JPM conveys information about the state of a qubit coupled to th
 e cavity without destroying it\, thus performing a quantum non-demolit
 ion measurement of the qubit's state. Multi-qubit generalizations of t
 his protocol are discussed.
URL:https://www.physics.wisc.edu/events/?id=3362
END:VEVENT
END:VCALENDAR