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Seminars
IQC Colloquium
Electron spin qubits: nanowire devices and robust control
Jonathan Baugh
Institute for Quantum Computing
I will present an overview of our efforts to realize and control single electron spins as qubits in nanowire-based quantum dots. The InAs double-dot devices under study are designed to allow all-electrical, universal quantum control via pulsed gate electrode voltages. Sub-nanosecond control of the exchange interaction between neighboring dots implements fast two-qubit logic. Spin-orbit mediated magnetic resonance will permit selective single qubit operations on the few nanosecond timescale. Strategies for high fidelity, single-shot read out of spin states on the microsecond timescale will also be discussed. Once these key control elements are in place, ideas borrowed from NMR can be used to improve the robustness of quantum control. I'll describe techniques for robust two-qubit gate operations and for dynamically preserving qubit coherence in the case that refocusing bandwidths are comparable to random nuclear hyperfine field strengths. Monday November 23rd, 2009 - 12:30 to 13:30 - RAC 2009
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