Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.47: Poster

Montag, 18. März 2024, 15:00–18:00, Poster C

Hybrid Qubits in Kitaev Chains — •Tobias Kuhn, Raffael L. Klees, and Mónica Benito — Universität Augsburg

The goal of this project is to investigate superconducting quantum dot arrays integrated with superconducting circuits as possible platforms for hybrid qubits. Under the appropriate magnetic fields, the effective mechanism of superconducting pairing along such arrays was predicted to be a spinless p-wave type, leading to the realization of a Kitaev chain with Majorana zero modes. When two such chains are embedded in a transmon circuit, hybrid qubits are formed [2] that could harness the controllability of transmon qubits and the topological protection of Majorana modes. In particular, we derive an effective low-energy Hamiltonian of the minimal Kitaev model [3], study extensions to longer chains as well as embeddings into circuit QED architectures [4]. As a future goal, the ability to perform single-qubit operations will be a first step towards quantum computing in such hybrid devices [5,6].

[1] A. Y. Kitaev, Phys.-Usp. 44, 131 (2001)

[2] D. M. Pino, R. S. Souto, R. Aguado, arXiv:2309.12313 (2023)

[3] M. Leijnse and K. Flensberg, Phys. Rev. B 86, 134528 (2012)

[4] A. Blais, A. L. Grimsmo, S. M. Girvin, and A. Wallraff, Rev. Mod. Phys. 93, 025005 (2021)

[5] A. Bargerbos et al., Phys. Rev. Lett. 131, 097001 (2023)

[6] M. Geier et al., arXiv:2307.05678 (2023)

Keywords: hybrid qubit; Kitaev chain; transmon qubit; circuit QED; Majorana