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The enigmatic 5/2 state and its potential use of topological quantum computation

Speaker: Robert Willett, Bell Labs
Date & Time: April 17, 2007 - 1:30pm
Location: Serin Physics 385E


The enigmatic 5/2 state and its potential use of topological quantum computation
Physics and Astronomy


Robert Willett, Bell Labs
1:30pm, Serin Physics 385E

Since its discovery over twenty years ago, the anomalous quantum Hall state at 5/2 filling factor has remained enigmatic in its theoretical description. Although materials advancements have allowed for improved experimental probing of the state's properties, the question remains open whether a picture of composite fermion d-wave or p-wave pairing best describes its origin. If the state proves to be p-wave paired, or consistent with the Moore-Read state, its proposed non-Abelian quasiparticle statistics may offer the opportunity to use the system for topological quantum computation (TQC). We will review experimental findings that address the origin of the state, describe theoretical models for using the state to perform rudimentary quantum computational operations, and present recent experimental efforts aimed at 5/2 state confinement and manipulation of its quasiparticles as proposed for TQC.

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