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UID:0-596@lptms.universite-paris-saclay.fr
DTSTART:20180329T113000Z
DTEND:20180329T120000Z
DTSTAMP:20180316T084333Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-alexandru-petrescu-seminaire-exceptionnel-2/
SUMMARY:Séminaire du LPTMS: Alexandru Petrescu *** séminaire exceptionnel
  *** - LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay - 29 M
 ar 18 11:30
DESCRIPTION:\n\n\nFluxon-based quantum simulation in circuit QED\n\n\n\nAle
 xandru Petrescu (Department of electrical engineering\, Princeton Universi
 ty\, USA)\n\n\n\n\nLong-lived fluxon excitations can be trapped inside a s
 uperinductor ring\, which can be realized with a long array of Josephson j
 unctions\, one of which offers the input/output path for the magnetic flux
  [1]. The superinductor ring can be separated into smaller loops by a peri
 odic sequence of Josephson junctions in the quantum regime\, thereby allow
 ing fluxons to tunnel between neighboring loops [2]. This model is dual to
  that of two-leg ladder bosons\, which have a rich phase diagram depending
  on flux and density [3–6]. By tuning the Josephson coupling\, and impli
 citly the tunneling probability amplitude of fluxons\, a wide class of 1D 
 tight-binding lattice models may be implemented and populated with a stabl
 e number of fluxons. In this context\, fluxons are lattice bosons with rep
 ulsive interactions. We illustrate this quantum simulation platform by dis
 cussing the Su-Schrieffer-Heeger model in the 1-fluxon subspace\, which ho
 sts a symmetry-protected topological phase with fractionally charged bound
  states at the edges [7\,8]. This pair of localized edge states could be u
 sed to implement a superconducting qubit increasingly decoupled from decoh
 erence mechanisms.\n\n\n\n\n 	[1]  N. A. Masluk\, I. M. Pop\, A. Kamal\, 
 Z. K. Minev\, and M. H. Devoret\, Phys. Rev. Lett. 109\, 137002 (2012).\n 
 	[2]  A. Petrescu\, H. E. Türeci\, A. V. Ustinov\, and I. M. Pop\, ArXiv
  e-prints (2017)\, arXiv:1712.08630 [cond-mat.mes-hall].\n 	[3]  E. Orign
 ac and T. Giamarchi\, Phys. Rev. B 64\, 144515 (2001).\n 	[4]  A. Petresc
 u and K. Le Hur\, Phys. Rev. Lett. 111\, 150601 (2013).\n 	[5]  M. Piraud
 \, F. Heidrich-Meisner\, I. P. McCulloch\, S. Greschner\, T. Vekua\, and U
 . Schollwöck\, Phys. Rev. B 91\, 140406 (2015).\n\n\n\n\n\n\n\n\n 	[6]  
 A. Petrescu\, M. Piraud\, G. Roux\, I. P. McCulloch\, and K. Le Hur\, Phys
 . Rev. B 96\, 014524(2017).\n 	[7]  R. Jackiw and C. Rebbi\, Phys. Rev. D
  13\, 3398 (1976).\n 	[8]  W. P. Su\, J. R. Schrieffer\, and A. J. Heeger
 \, Phys. Rev. Lett. 42\, 1698 (1979).\n\n\n\n\n\n\n
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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