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SUMMARY:Scott Lecture II : Counting and controlling photons non-destructiv
 ely. - Professor Serge Haroche\, Collège de France and Ecole Normale Sup
 érieure\, Paris
DTSTART:20140507T150000Z
DTEND:20140507T160000Z
UID:TALK51988@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:Usually photons are destroyed when they are detected. Photon d
 emolition is however not a fate required by quantum principles.  An atomic
  clock operating with Rydberg atoms counts photons non destructively\, dir
 ectly revealing the quantum jumps of the electromagnetic field. By impleme
 nting quantum feedback methods\, radiation states with well defined photon
  numbers can be prepared and maintained in a cavity for an arbitrary time.
  These atomic physics experiments are now extended in the domain of conden
 sed matter physics\, the Rydberg atoms being replaced by artificial atoms 
 made of Josephson junction circuits. Applications to quantum information s
 cience will be discussed.  
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory\, Department of Ph
 ysics
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