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Quantum control of hybrid nuclear–electronic qubits

14 December 2012

G.W. Morley, P. Lueders, M.H. Mohammady, S.J. Balian, G. Aeppli, C.W.M. Kay, W.M. Witzel, G. Jeschke, T.S. Monteiro

Nature Materials (2012)
Quantum control of hybrid nuclear–electronic qubits

Members of the UCL AMO group and their collaborators have demonstrated quantum control of a hybridised nuclear-electronic spin system. The group has been investigating the magnetic resonance properties of bismuth-doped silicon, and the potential of such a system as a platform for quantum computing.

Their research has built upon previous work whereby interesting possibilities in the hybrid regime were identified when the nuclear and electronic spins are strongly entangled. (Mohammady, Morley, Monteiro, Physical Review Letters, 105, 067602 (2010))

For example, operating on a nuclear spin typically takes about 1000 times longer than an electronic spin i.e. microseconds, rather than nanoseconds. This is due to the substantially smaller magnetic moment. However this paper demonstrates that in the hybrid regime, the required pulse times equalise; allowing a considerable increase in speed of quantum operations.