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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Dynamics of an oscillator bounded in energy by a Z
 eno-like effect - Huard\, B (cole Normale Suprieur
 e)
DTSTART;TZID=Europe/London:20140808T103000
DTEND;TZID=Europe/London:20140808T111000
UID:TALK53674AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/53674
DESCRIPTION:Co-authors: Landry Bretheau (Ecole Normale Superie
 ure\, Paris\, France)\, Philippe Campagne-Ibarcq (
 Ecole Normale Superieure\, Paris\, France)\, Emman
 uel Flurin (Ecole Normale Superieure\, Paris\, Fra
 nce)\, Francois Mallet (Ecole Normale Superieure\,
  Paris\, France) \n\nIn the strong coupling regime
  of circuit-QED\, a qubit can be used as a photoco
 unter. Leading to a binary response only\, it is p
 ossible to probe whether or not the cavity has N p
 hotons for any number N we choose. By repeatedly a
 sking 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 drivin
 g and starting from the ground state of the cavity
 \, this Zeno blockade is thus similar to a transfo
 rmation of the oscillator into an N/2 spin. Intere
 stingly\, one can also produce the same blockade w
 ithout any dissipation or readout by driving the q
 ubit at the resonance frequency it exhibits when t
 he cavity is in state |N>. We have realized this b
 lockade using superconducting circuits and measure
 d the photon number distribution and Wigner functi
 on of the cavity mode as a function of time\, whil
 e driving the effective N/2 spin. Interesting non-
 classical s tates develop during the evolution.\n
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:Mustapha Amrani
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