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SUMMARY:Collective qubits and hybrid schemes for quantum computing - Klaus
  Moelmer (University of Aarhus\, Denmark)
DTSTART:20100513T150000Z
DTEND:20100513T160000Z
UID:TALK24772@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:In conventional registers for quantum information processing\,
  quantum bits are associated with individual two-level quantum systems. Se
 parate addressing and interaction with these systems permit one-bit gates\
 , while an interaction between systems is needed to accomplish two-bit gat
 es. I will review a recent proposal to implement quantum computing in coll
 ective\nexcitation degrees of freedom in ensembles of identical quantum sy
 stems.\nIn this proposal one does not need to address individual particles
 \, but one needs an interaction between all particles in the system. Such 
 interactions exist in hybrid systems where large spin-ensembles are couple
 d to superconducting qubit elements via a resonant single mode of the quan
 tized radiation field. We will review the main ideas of ensemble encoding 
 and we will discuss recent results on the effects of unwanted interactions
  and inhomogeneities in such systems\n
LOCATION:Rutherford building\, Seminar Room B
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