Chang Y.-CHuang IChen C.-YLin M.-JSHIH-YUAN CHENJIUN-YUN LI2022-04-252022-04-25202100036951https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121964899&doi=10.1063%2f5.0072414&partnerID=40&md5=3989862850d81dbc2ff043c442c08e6bhttps://scholars.lib.ntu.edu.tw/handle/123456789/607226Coherent control of electron spins in multiple quantum dots (QDs) is critical for realizing large-scale spin qubits. The manipulation of electron spins in Si QDs can be achieved by electron spin resonance (ESR). While the effective spin control over a single qubit has been demonstrated, the architecture of ESR lines for large-scale spin qubits has yet to be demonstrated. In this paper, we propose an ESR meanderline for large-scale Si QDs. Simulation results show that magnetic fields can be effectively enhanced with low electric fields using a meanderline, enabling high-fidelity and low-noise control over electron spins in a 50-qubit system. Reflection coefficients of ESR meanderlines by on-wafer microwave measurements show low loss (-7 dB) for a 3-qubit device at a frequency range of 10 to 50 GHz. ? 2021 Author(s).Electric fieldsElectron spin resonance spectroscopyElectronsElectrospinningMagnetic momentsNanocrystalsQuantum opticsQubitsSemiconductor quantum dotsSilicon wafersCoherent controlElectron-spin resonanceLarge-scalesMeander lineMultiple quantum dotsResonance lineSi quantum dotSingle qubitsSpin controlSpin qubitSpin dynamicsjournal article10.1063/5.00724142-s2.0-85121964899