Regular events
Titel Referent Datum Ort

Garst, Mirlin, Rockstuhl, Schmalian, Shnirman

Mo 14.00-15.30

10-01

Garst, Rockstuhl

Di 13.00-14.00

10-01

Fr 15.45-17.15

Lehmann HS

Do 17.15-18.45

Skyrmion Twist to Quantum Computing

TFP Institutsseminar

Speaker:

Christina Psaroudaki

Date:

18/10/2022 12:30

Where:

Room 10.01, Bldg. 30.23 CS and Zoom

Affiliation:

Universität zu Köln

Host:

Maria Azhar

Abstract

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 a 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, Phys. Rev. B 106, 104422 (2022).