Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Magnonics 1
MA 13.6: Vortrag
Dienstag, 6. September 2022, 10:45–11:00, H43
Employing magnons for generating multi-qubit entangled states for quantum error correction — Ida Skogvoll1, Jonas Lidal1, Jeroen Danon1, and •Akashdeep Kamra2,1 — 1Center for Quantum Spintronics, Norwegian University of Science and Technology, Trondheim, Norway — 2Condensed Matter Physics Center (IFIMAC) and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain
The ongoing rapid progress towards quantum technologies relies on new hybrid platforms optimized for specific quantum computation and communication tasks, and researchers are striving to achieve such platforms. We study theoretically a spin qubit exchange-coupled to an anisotropic ferromagnet that hosts magnons with a controllable degree of intrinsic squeezing. We find this system to physically realize the quantum Rabi model from the isotropic to the Jaynes-Cummings limit with coupling strengths that can reach the deep-strong regime. We demonstrate that the composite nature of the squeezed magnon enables concurrent excitation of three spin qubits coupled to the same magnet. Thus, three-qubit Greenberger-Horne-Zeilinger and related states needed for implementing Shor’s quantum error-correction code can be robustly generated. Our analysis highlights some unique advantages offered by this hybrid platform, and we hope that it will motivate corresponding experimental efforts.
I. C. Skogvoll, J. Lidal, J. Danon, and A. Kamra, Phys. Rev. Applied 16, 064008 (2021).