Circuit quantum electrodynamics with a spin qubit

K. D. Petersson, L. W. McFaul, M. D. Schroer, M. Jung, J. M. Taylor, A. A. Houck, J. R. Petta

Research output: Contribution to journalArticle

267 Scopus citations

Abstract

Electron spins trapped in quantum dots have been proposed as basic building blocks of a future quantum processor. Although fast, 180-picosecond, two-quantum-bit (two-qubit) operations can be realized using nearest-neighbour exchange coupling, a scalable, spin-based quantum computing architecture will almost certainly require long-range qubit interactions. Circuit quantum electrodynamics (cQED) allows spatially separated superconducting qubits to interact via a superconducting microwave cavity that acts as a 'quantum bus', making possible two-qubit entanglement and the implementation of simple quantum algorithms. Here we combine the cQED architecture with spin qubits by coupling an indium arsenide nanowire double quantum dot to a superconducting cavity. The architecture allows us to achieve a charge-cavity coupling rate of about 30megahertz, consistent with coupling rates obtained in gallium arsenide quantum dots. Furthermore, the strong spin-orbit interaction of indium arsenide allows us to drive spin rotations electrically with a local gate electrode, and the charge-cavity interaction provides a measurement of the resulting spin dynamics. Our results demonstrate how the cQED architecture can be used as a sensitive probe of single-spin physics and that a spin-cavity coupling rate of about one megahertz is feasible, presenting the possibility of long-range spin coupling via superconducting microwave cavities.

Original languageEnglish (US)
Pages (from-to)380-383
Number of pages4
JournalNature
Volume490
Issue number7420
DOIs
StatePublished - Oct 18 2012

All Science Journal Classification (ASJC) codes

  • General

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    Petersson, K. D., McFaul, L. W., Schroer, M. D., Jung, M., Taylor, J. M., Houck, A. A., & Petta, J. R. (2012). Circuit quantum electrodynamics with a spin qubit. Nature, 490(7420), 380-383. https://doi.org/10.1038/nature11559