<p>Silicon spin qubits have emerged as one of the most promising platforms for quantum computing. To achieve scalability, the spin-photon coupling in the frame of circuit-QED offers a reliable architecture that garners significant attention. Depending on the coupling mechanisms, spin-photon coupling is categorized into transverse (<i>g</i><sub><i>x</i></sub>) and longitudinal (<i>g</i><sub><i>z</i></sub>) components, each offering distinct advantages for operation and readout, respectively. In practical scenarios, <i>g</i><sub><i>x</i></sub> and <i>g</i><sub><i>z</i></sub> often coexist and interfere with each other. To enable on-demand separation of these two couplings, we propose an alternative scheme based on spin-orbit torque (SOT). By employing SOT to switch the magnetization of micromagnets, the symmetry of the stray fields surrounding the spin qubit is modified, naturally isolating <i>g</i><sub><i>x</i></sub> and <i>g</i><sub><i>z</i></sub>. Furthermore, within this SOT scheme, we demonstrate that the dynamic longitudinal coupling (<i>g</i><Stack> <sub><i>z</i></sub> <sup>dy</sup> </Stack>) can also be fully decoupled from <i>g</i><sub><i>x</i></sub> through applying appropriate parametric driving. Our results thus pave the way toward scalable silicon spin qubit architectures.</p>

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Complete switching of transverse and longitudinal spin-photon coupling in silicon

  • Fang-Ge Li,
  • Ranran Cai,
  • Ze-Cheng Wei,
  • Bao-Chuan Wang,
  • Hai-Ou Li,
  • Gang Cao,
  • Guo-Ping Guo

摘要

Silicon spin qubits have emerged as one of the most promising platforms for quantum computing. To achieve scalability, the spin-photon coupling in the frame of circuit-QED offers a reliable architecture that garners significant attention. Depending on the coupling mechanisms, spin-photon coupling is categorized into transverse (gx) and longitudinal (gz) components, each offering distinct advantages for operation and readout, respectively. In practical scenarios, gx and gz often coexist and interfere with each other. To enable on-demand separation of these two couplings, we propose an alternative scheme based on spin-orbit torque (SOT). By employing SOT to switch the magnetization of micromagnets, the symmetry of the stray fields surrounding the spin qubit is modified, naturally isolating gx and gz. Furthermore, within this SOT scheme, we demonstrate that the dynamic longitudinal coupling (g z dy ) can also be fully decoupled from gx through applying appropriate parametric driving. Our results thus pave the way toward scalable silicon spin qubit architectures.