Strong coupling of a spin qubit to a superconducting stripline cavity

Xuedong Hu, Yu-xi Liu, and Franco Nori

Phys. Rev. B 86, 035314 – Published 16 July 2012

Abstract

We study electron-spin-photon coupling in a single-spin double quantum dot embedded in a superconducting stripline cavity. With an external magnetic field, we show that either a spin-orbit interaction (for InAs) or an inhomogeneous magnetic field (for Si and GaAs) could produce a strong spin-photon coupling, with a coupling strength of the order of 1 MHz. With an isotopically purified Si double dot, which has a very long spin coherence time for the electron, it is possible to reach the strong-coupling limit between the spin and the cavity photon, as in cavity quantum electrodynamics. The coupling strength and relaxation rates are calculated based on parameters of existing devices, making this proposal experimentally feasible.

Received 2 May 2012

DOI:https://doi.org/10.1103/PhysRevB.86.035314

Authors & Affiliations

Xuedong Hu

Department of Physics, University at Buffalo, SUNY, Buffalo, New York 14260-1500, USA

Yu-xi Liu

Institute of Microelectronics, Tsinghua University, Beijing 100084, China, Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China, and Advanced Science Institute, RIKEN, Wako, Saitama 351-0918, Japan

Franco Nori