Spin-orbit qubit on a multiferroic insulator in a superconducting resonator

P. Zhang; Ze-Liang Xiang; Franco Nori

doi:10.1103/PhysRevB.89.115417

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Spin-orbit qubit on a multiferroic insulator in a superconducting resonator

P. Zhang, Ze-Liang Xiang, Franco Nori

DOI 10.1103/PhysRevB.89.115417 · Physical Review B

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Abstract

We propose a spin-orbit qubit in a nanowire quantum dot on the surface of a multiferroic insulator with a cycloidal spiral magnetic order. The spiral exchange field from the multiferroic insulator causes an inhomogeneous Zeeman-like interaction on the electron spin in the quantum dot, producing a spin-orbit qubit. The absence of an external magnetic field benefits the integration of such a spin-orbit qubit into high-quality superconducting resonators. By exploiting the Rashba spin-orbit coupling in the quantum dot via a gate voltage, one can obtain an effective spin-photon coupling with an efficient on-off switching. This makes the proposed device controllable and promising for hybrid quantum circuits.