Skyrmion twist to quantum computing

In this talk, I will introduce a new class of primitive building blocks for realizing quantum logic elements based on nanoscale topological solitons called skyrmions [1]. In a skyrmion qubit, information is stored in the quantum degree of helicity, and the logical states can be adjusted by electric and magnetic fields, offering a rich operation regime. I will discuss appropriate microwave pulses required to generate single-qubit gates for quantum computing, and skyrmion multiqubit schemes for a scalable architecture with tailored couplings. Scalability, controllability by microwave fields, operation time scales, and readout by nonvolatile techniques converge to make the skyrmion qubit highly attractive as a logical element of a quantum processor.

The applicability to quantum operations, however, depends on the viability of macroscopic quantum tunneling, a precondition for a quantum computer. We predict quantum tunneling processes for a typical skyrmion spin texture of 5 nm radius to occur with an inverse escape rate within seconds below 100 mK [2]. In the absence of an energy bias, quantum tunneling effects give rise to an energy tunnel splitting in the MHz regime. Our studies offer the parameter space for a practical recipe in device architectures to explore magnetic helicity in the solid-state for qubit operations.

[1] C. Psaroudaki and C. Panagopoulos, Phys. Rev. Lett. 127, 067201 (2021).
[2] C. Psaroudaki and C. Panagopoulos, arXiv:2205.15155 (2022).

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