Condensed Matter Physics Seminar
2 p.m., Thursday, October 9, 2003
Room 1201, Physics Building
Pseudospin quantum computation in semiconductor
nanostructures
Kwon Park
(Condensed Matter Theory Center, University of Maryland)
Abstract: We study vertically coupled double quantum dots under an
strong external magnetic field in the quantum Hall regime. We predict a novel
evenodd effect in the Coulombblockade spectra which is a direct manifestation
of spontaneous interlayer phase coherence, and is the precise quantum Hall
analog of the Josephson effect in the Cooper pair box problem. Coherent
fluctuations in the number of Cooper pairs in mesoscopic superconducting grains
are analogous to the fluctuations in the relative number difference between the
two layers in quantum Hall droplets. Finally, it is shown that this
spontaneously interlayercoherent bilayer quantum Hall droplets should allow
robust pseudospin quantum computation in semiconductor nanostructures with
voltagetuned external gates providing qubit control and a quantum Ising
Hamiltonian providing qubit entanglement.

Host: Das Sarma
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