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 even-odd effect in the Coulomb-blockade 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 interlayer-coherent bilayer quantum Hall droplets should allow robust pseudospin quantum computation in semiconductor nanostructures with voltage-tuned external gates providing qubit control and a quantum Ising Hamiltonian providing qubit entanglement.
Host:  Das Sarma
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