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SUMMARY:Quantum Limits on Noise in Linear Amplifiers - Carlton M. Caves (C
 enter for Quantum Information and Control\, University of New Mexico\; and
   Centre for Engineered Quantum Systems\, University of Queensland)
DTSTART:20120719T110000Z
DTEND:20120719T120000Z
UID:TALK38975@talks.cam.ac.uk
CONTACT:Richard Jozsa
DESCRIPTION:The approach of Josephson-effect linear amplifiers to the fund
 amental quantum limit on noise temperature has sparked renewed interest in
  low-noise linear amplifiers. The standard\, by now highly developed\, dis
 cussion of quantum limits on phase-preserving linear amplifiers characteri
 zes amplifier noise performance in terms of second moments of the added no
 ise\, i.e.\, in terms of noise temperature or noise power. We have general
 ized this standard discussion to provide a complete characterization of th
 e quantum-mechanical restrictions on the entire probability distribution o
 f added noise. Meanwhile\, there have been proposals for and experiments r
 elated to a different class of linear amplifiers\, so-called nondeterminis
 tic linear amplifiers\, which operate only part of the time\, but which\, 
 when they operate\, take an input coherent state to an amplified output co
 herent state. We discuss here what is known about quantum limits on the op
 eration of such amplifiers.\n\nThis work was carried out with Shashank Pan
 dey\, Zhang Jiang\, and Josh Combes\, all of UNM\, and parts were also don
 e with Marco Piani of the Perimeter Institute. 
LOCATION:MR14\, Centre for Mathematical Sciences
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