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SUMMARY:The Part is Greater than the Sum of the Wholes: How to Spin Light 
 Into Anyons - Eliot Kapit\, Oxford University
DTSTART:20131114T141500Z
DTEND:20131114T151500Z
UID:TALK48769@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:Recent progress in microwave quantum optics and superconductin
 g qubits has made the creation of strongly correlated--and even topologica
 lly ordered--states of photons a real possibility. Many of these states ar
 e gapped and exhibit anyon excitations\, which could be used for a robust 
 form of quantum information processing. In this talk\, I present the three
  key concepts necessary for generating a fractional quantum Hall state of 
 photons in a superconducting qubit array. I first review how the exact low
 est Landau level of the continuum can be reconstructed in a lattice with n
 ext nearest neighbor hopping. Following that\, I describe a proposal for i
 mplementing the complex hopping necessary to simulate an artificial gauge 
 field. Schemes of this type are not based on the quantization of 2e and ar
 e thus free of charge noise effects. Finally\, I show that an auxiliary "s
 hadow" lattice of qubits with a rapid decay rate can protect the quantum s
 tate of the primary quantum simulator through a form of passive error corr
 ection\, holding it in or near the Laughlin state for arbitrarily long tim
 es without action from an external observer. All the mechanisms I describe
  here are within reach of current technology\, suggesting that fractional 
 quantum Hall states of light could be close at hand.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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