Polytype control of spin qubits in silicon carbide

Abram L. Falk, Bob B. Buckley, Greg Calusine, William F. Koehl, Viatcheslav V. Dobrovitski, Alberto Politi, Christian A. Zorman, Philip X.-L. Feng and David D. Awschalom ()
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Abram L. Falk: Center for Spintronics and Quantum Computation, University of California, Santa Barbara
Bob B. Buckley: Center for Spintronics and Quantum Computation, University of California, Santa Barbara
Greg Calusine: Center for Spintronics and Quantum Computation, University of California, Santa Barbara
William F. Koehl: Center for Spintronics and Quantum Computation, University of California, Santa Barbara
Viatcheslav V. Dobrovitski: Ames Laboratory and Iowa State University
Alberto Politi: Center for Spintronics and Quantum Computation, University of California, Santa Barbara
Christian A. Zorman: Case School of Engineering, Case Western Reserve University
Philip X.-L. Feng: Case School of Engineering, Case Western Reserve University
David D. Awschalom: Center for Spintronics and Quantum Computation, University of California, Santa Barbara

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Crystal defects can confine isolated electronic spins and are promising candidates for solid-state quantum information. Alongside research focusing on nitrogen-vacancy centres in diamond, an alternative strategy seeks to identify new spin systems with an expanded set of technological capabilities, a materials-driven approach that could ultimately lead to ‘designer’ spins with tailored properties. Here we show that the 4H, 6H and 3C polytypes of SiC all host coherent and optically addressable defect spin states, including states in all three with room-temperature quantum coherence. The prevalence of this spin coherence shows that crystal polymorphism can be a degree of freedom for engineering spin qubits. Long spin coherence times allow us to use double electron–electron resonance to measure magnetic dipole interactions between spin ensembles in inequivalent lattice sites of the same crystal. Together with the distinct optical and spin transition energies of such inequivalent states, these interactions provide a route to dipole-coupled networks of separately addressable spins.

Date: 2013
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DOI: 10.1038/ncomms2854

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