Topological qubits in Silicon?

While FQHE ground states are exotic states of matter observed only in extreme conditions (typically at temperatures T<1 K and in magnetic fields B>1 Tesla), there are indications that these states may have applications as topological qubits for quantum information processing.  Although the fractional state at 5/2, so far observed only in very high mobility GaAs heterostructures, is the most likely candidate FQHE state for topological qubits, it is possible that multicomponent systems (like the multivalley silicon electrons we have measured) will also have the properties necessary for topological quantum computation.  The silicon surface devices we have developed may be the best system available for probing the topological properties of FQHE states in a multicomponent system.