Circuit quantum electrodynamics with a spin qubit

By K. Petersson, L. W. McFaul, M. D. Schroer, M. Jung, Jacob M. Taylor, Andrew A. Houck, Jason R. Petta. Nature, 2012

425 citations recorded by the source corpus.

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 30 megahertz, 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.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/132dbcf101591f72038184eeee2dcdf8eca8dd58

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Citations in the corpus

Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, methodology): “In another experiment (Petersson et al., 2012), a spin qubit in a double quantum dot was manipulated via a classical microwave signal applied through the CPW resonator, with the spin-charge interface provided by the spin-orbit interaction.”
New perspectives for Rashba spin-orbit coupling. (2015, background): “The demonstration of SO qubits coupled to superconducting resonators paves way for a scalable quantum computing architecture [50].”
Silicon quantum electronics (2012, methodology): “Among solid-state qubits, great success in multi-qubit coupling has been obtained by combining superconducting qubits and microwave cavities (You and Nori, 2011), and similar methods are being applied to semiconductor quantum dots (Frey et al., 2012; Petersson et al., 2012).”
Materials challenges and opportunities for quantum computing hardware (2021, background): “Hybrid quantum systems with superconducting cavities integrated with semiconductor quantum dots (157, 158) also show promising results for realizing longrange qubit interactions (159–161), but we focus on materials issues in spin qubit arrays using nearest-neighbor interactions.”
Circuit quantum electrodynamics (2020, background): “…double quantum dots in nanotubes (Delbecq et al., 2011), GaAs (Frey et al., 2012; Toida et al., 2013; Wallraff et al., 2013), and InAs nanowires (Petersson et al., 2012) have demonstrated dispersive coupling and its use for characterizing charge states of quantum dots (Burkard et al., 2020).”