High fidelity quantum control in solid-state magnetic resonance
Speaker: Prof. Jonathan Baugh, Institute for Quantum Computing, University of Waterloo, Canada
Series: Topical Seminars
Location: Bowen Hall Auditorium
Date/Time: Monday, March 7, 2011, 12:30 p.m. - 1:30 p.m.
Nuclear magnetic resonance has provided a fruitful testing ground for the ideas of quantum information processing, with universal control of up to 12 qubits demonstrated in the liquid state. The solid state, on the other hand, offers the prospect of dynamic nuclear polarization and heat-bath algorithmic cooling, longer spin coherence times, and faster quantum gates. In particular, we are interested in coupled electron-nuclear spin systems where the anisotropic hyperfine interaction plays a key role in allowing the electron spin to mediate fast nuclear-nuclear interactions, and electronic spin polarizations can approach unity at low temperatures. The first part of the talk will focus on recent solid-state NMR experiments in which we achieve very good control, sufficient to implement two rounds of a three-qubit quantum error correcting code, demonstrating a marked improvement over a single round. The second part will focus on ESR experiments on a 1-electron, 2-nuclear spin system where achieving good control experimentally is more challenging, and work is in progress to achieve fidelities comparable to NMR. Given good quantum control, the latter type of system will make it possible to reach nearly pure nuclear spin states and form an interesting testbed for quantum error correction and dynamic decoupling techniques.