2022. 10. 07. 10:15
BME building F, seminar room of the Dept. of Theoretical Physics
Zoltán György (ELTE)
The spin degree of freedom of an electron confined in a quantum dot naturally defines a qubit. Spin qubits in semiconductors, such as silicon or germanium, are promising candidates for the building block of a future scalable fault-tolerant quantum computer. Electrically driven spin resonance (EDSR) is an established tool for controlling semiconductor spin qubits. In our work  we theoretically study a frequency-mixing variant of EDSR, where two driving tones with different drive frequencies are applied, and the resonance condition connects the spin Larmor frequency with the sum of the two drive frequencies. Focusing on flopping-mode operation of a single electron in a double quantum dot with spin-orbit interaction, we calculate the parameter dependence of the Rabi frequency and the Bloch-Siegert shift. A shared-control spin qubit architecture could benefit from this bichromatic EDSR scheme, as it enables simultaneous single-qubit gates.
 György, Z., Pályi, A., & Széchenyi, G. (2022). Electrically driven spin resonance with bichromatic driving. arXiv preprint arXiv:2206.00399.