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SUMMARY:Time-reversal-symmetry breaking in circuit-QED-based photon lattic
 es - Felix Nissen (Cavendish Lab (TCM) / Churchill College)
DTSTART:20101119T160000Z
DTEND:20101119T163000Z
UID:TALK27262@talks.cam.ac.uk
CONTACT:Daniel Cole
DESCRIPTION:"J. Koch\, A. A. Houck\, K. Le Hur\, and S. M. Girvin\, Phys. 
 Rev. A 82\, 043811 (2010) ":http://pra.aps.org/abstract/PRA/v82/i4/e043811
 \n\nBreaking time-reversal symmetry is a prerequisite for accessing certai
 n interesting many-body states such as fractional quantum Hall states. For
  polaritons\, charge neutrality prevents magnetic fields from providing a 
 direct symmetry-breaking mechanism and\, similar to the situation in ultra
 cold atomic gases\, an effective magnetic field has to be synthesized. We 
 show that in the circuit-QED architecture\, this can be achieved by insert
 ing simple superconducting circuits into the resonator junctions. In the p
 resence of such coupling elements\, constant parallel magnetic and electri
 c fields suffice to break time-reversal symmetry. We support these theoret
 ical predictions with numerical simulations for realistic sample parameter
 s\, specify general conditions under which time reversal is broken\, and d
 iscuss the application to chiral Fock-state transfer\, an on-chip circulat
 or\, and tunable band structure for the Kagome lattice.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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