Quantum control of spin qubits using magnetic skyrmions

Quantum control of individual qubits in a dense chip without cross-talk is a fundamental challenge in implementing scalable high-fidelity universal quantum gates [1-2]. Previously, we have shown the feasibility of scalable, small footprint, high-fidelity, and energy-efficient single-qubit quantum gates by tuning the frequency and phase of the nanomagnet’s electric field drive to the Larmor frequency of the spins confined to a nanoscale volume [3]. While the nanoscale magnets allow for energy-efficient and highly localized control field with minimal effect on neighboring qubits, the operating frequency is limited to few GHz. In this work, we show a technique of energy-efficient quantum control of spin qubits with topologically protected nanoscale magnetic skyrmions allowing high frequency control of spin qubits (nominally five times that with nanomagnets) which can potentially lead to high-speed, scalable, and high fidelities quantum computing [4].

1. Chatterjee, A. et al. Nature Reviews Physics 3, 157–177 (2021).

2. Nadj-Perge, S. Nature 468, 1084–1087 (2010).

3. Niknam, Mohamad et al. arXiv:2203.16720 (2022).

4. Gottesman, D. Phys. Rev. A 57, 127–137 (1998).