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SUMMARY:Dynamics of an oscillator bounded in energy by a Zeno-like effect 
 - Huard\, B (cole Normale Suprieure)
DTSTART:20140808T093000Z
DTEND:20140808T101000Z
UID:TALK53674@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-authors: Landry Bretheau (Ecole Normale Superieure\, Paris\
 , France)\, Philippe Campagne-Ibarcq (Ecole Normale Superieure\, Paris\, F
 rance)\, Emmanuel Flurin (Ecole Normale Superieure\, Paris\, France)\, Fra
 ncois Mallet (Ecole Normale Superieure\, Paris\, France) \n\nIn the strong
  coupling regime of circuit-QED\, a qubit can be used as a photocounter. L
 eading to a binary response only\, it is possible to probe whether or not 
 the cavity has N photons for any number N we choose. By repeatedly asking 
 this question\, it is possible to freeze the evolution of the cavity mode 
 by Zeno effect into either the number state |N> or the space generated by 
 all the other states. Allowing resonant driving and starting from the grou
 nd state of the cavity\, this Zeno blockade is thus similar to a transform
 ation of the oscillator into an N/2 spin. Interestingly\, one can also pro
 duce the same blockade without any dissipation or readout by driving the q
 ubit at the resonance frequency it exhibits when the cavity is in state |N
 >. We have realized this blockade using superconducting circuits and measu
 red the photon number distribution and Wigner function of the cavity mode 
 as a function of time\, while driving the effective N/2 spin. Interesting 
 non-classical s tates develop during the evolution.\n
LOCATION:Seminar Room 1\, Newton Institute
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