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SUMMARY:Cross-Kerr non-linearities for quantum non-demolition measurement 
 - Stace\, T (University of Queensland)
DTSTART:20140806T084500Z
DTEND:20140806T092500Z
UID:TALK53662@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Various proposals exist that exploit cross-Kerr non-linearitie
 s between electromagnetic fields\, for quantum non-demolition (QND) measur
 ements\, and other related protocols. Typically\, these proposals assume t
 he existence of such non-linearities\, based on a presumption that the int
 ernal dynamics of the medium can be eliminated from the problem. I will di
 scuss some recent work in which we explicitly include the medium. We show 
 that homodyne detection of a probe field\, plus classical signal processin
 g\, is sufficient to yield an itinerant microwave photon counter with fide
 lities above 90%. Our analysis has implications for the validity of a wide
 r range of proposed cross-Kerr based quantum information protocols\, which
  may need revision in consequence.\n
LOCATION:Seminar Room 1\, Newton Institute
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