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CATEGORIES:CQIF Seminar
SUMMARY:Quantum Limits on Noise in Linear Amplifiers - Car
lton M. Caves (Center for Quantum Information and
Control\, University of New Mexico\; and Centre f
or Engineered Quantum Systems\, University of Quee
nsland)
DTSTART;TZID=Europe/London:20120719T120000
DTEND;TZID=Europe/London:20120719T130000
UID:TALK38975AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/38975
DESCRIPTION:The approach of Josephson-effect linear amplifiers
to the fundamental quantum limit on noise tempera
ture has sparked renewed interest in low-noise lin
ear amplifiers. The standard\, by now highly devel
oped\, discussion of quantum limits on phase-prese
rving linear amplifiers characterizes amplifier no
ise performance in terms of second moments of the
added noise\, i.e.\, in terms of noise temperature
or noise power. We have generalized this standard
discussion to provide a complete characterization
of the quantum-mechanical restrictions on the ent
ire probability distribution of added noise. Meanw
hile\, there have been proposals for and experimen
ts related to a different class of linear amplifie
rs\, so-called nondeterministic linear amplifiers\
, which operate only part of the time\, but which\
, when they operate\, take an input coherent state
to an amplified output coherent state. We discuss
here what is known about quantum limits on the op
eration of such amplifiers.\n\nThis work was carri
ed out with Shashank Pandey\, Zhang Jiang\, and Jo
sh Combes\, all of UNM\, and parts were also done
with Marco Piani of the Perimeter Institute.
LOCATION:MR14\, Centre for Mathematical Sciences
CONTACT:Richard Jozsa
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