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 sig...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(g_(x))and longitudinal(g_(z))components,each offering distinct advantages for operation and readout,respectively.In practical scenarios,g_(x) and g_(z) 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 g_(x)and g_(z).Furthermore,within this SOT scheme,we demonstrate that the dynamic longitudinal coupling(g_(z)^(dy))can also be fully decoupled from g_(x) through applying appropriate parametric driving.Our results thus pave the way toward scalable silicon spin qubit architectures.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12304560,92265113,12074368,and 12034018)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302300)China Postdoctoral Science Foundation(Grant Nos.BX20220281,and 2023M733408).
文摘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(g_(x))and longitudinal(g_(z))components,each offering distinct advantages for operation and readout,respectively.In practical scenarios,g_(x) and g_(z) 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 g_(x)and g_(z).Furthermore,within this SOT scheme,we demonstrate that the dynamic longitudinal coupling(g_(z)^(dy))can also be fully decoupled from g_(x) through applying appropriate parametric driving.Our results thus pave the way toward scalable silicon spin qubit architectures.
基金supported by National Natural Science Foundation of China(NSFC)under Grant No.61370090the Key Project of Chinese Ministry of Education under Grant No.211080+2 种基金the Talent Project of the Anhui Province for Outstanding Youth under Grant:2013SQRL064ZDthe Natural Science Foundation of Anhui Province under Grant No.1408085MA20the Key Program of Research Base of Hefei Normal University under Grant No.2012jd13
