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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-12@lptms.universite-paris-saclay.fr
DTSTART:20120118T143000Z
DTEND:20120118T143000Z
DTSTAMP:20130418T124712Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-fluides
 -quantiques-guilia-ferrini/
SUMMARY:Séminaire "fluides quantiques" : Guilia Ferrini - LPTMS\, salle 20
 1\, 2ème étage\, Bât 100\, Campus d'Orsay - 18 Jan 12 14:30
DESCRIPTION:Macroscopic superpositions in the presence of phase noise in a 
 Bose Josephson junction\nGuilia Ferrini\, LKB (CNRS - Université P. et M.
  Curie)\nA Bose Josephson Junction is a system composed of bosons which ca
 n occupy two modes which can be coupled. This system models either an ultr
 acold bosonic gas trapped in a double-well potential\, either a gas of ult
 racold bosons in two different hyperfine states\, trapped in the same harm
 onic potential. Both configurations have been experimentally realized\, an
 d found interesting applications\, e.g. in high-precision interferometry [
 1]. If the system is initially prepared in a coherent state and evolves af
 ter suppressing the coupling of the two modes\, at short time the state un
 dergoes squeezing [2]\, and at larger time macroscopic superpositions of c
 oherent states are formed [3]. One of the most relevant sources of noise i
 n such a system\, together with particle losses\, is phase noise\, resulti
 ng from stochastic fluctuations of the energies of the two modes. We addre
 ss the question how the presence of phase noise affects the formation of s
 queezed states and macroscopic superpositions\, showing in particular how 
 these latter display an unexpected robustness against decoherence induced 
 by the noise considered [4].\n[1] M. Albiez et al\, Phys. Rev. Lett. 95\, 
 010402 (2005)\; J. Esteve et al\, Nature 455\, 1216 (2008). [2] C. Gross e
 t al\, Nature 464\, 1165 (2010). M. Kitagawa and M. Ueda\, Phys. Rev. A 47
 \, 5138 (1993). [3] F. Piazza\, L. Pezze and A. Smerzi\, Phys. Rev. A 78\,
  051601 (2008)\; G. Ferrini\, A. Minguzzi and F.W.J. Hekking\, Phys. Rev. 
 A 78\, 023606 (2008). [4] G. Ferrini et al\, Phys. Rev. A 82\, 033621 (201
 0)\; Phys. Rev. A 84\, 043628 (2011).
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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