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This article is cited in 1 scientific paper (total in 1 paper)
QUANTUM INFORMATION SCIENCE
Effective Hamiltonian of topologically protected qubit in a helical crystal
R. A. Niyazovab, D. N. Aristovabc, V. Yu. Kachorovskiib a Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, 188300 Russia
b Ioffe Institute, St. Petersburg, 194021 Russia
c Faculty of Physics, St. Petersburg State University, St. Petersburg, 199034 Russia
Abstract:
We study a superlattice formed by tunnel-coupled identical antidots periodically situated in a two-dimensional topological insulator placed in a magnetic field. The superlattice spectrum can be controlled by gate electrodes or by changing the magnetic flux through the antidots. We demonstrate that a topologically protected qubit appears at the boundary between two regions with different fluxes. The qubit properties depend on the value of the flux jump on the boundary and can be controlled by the gate voltage. We derive the effective Hamiltonian of such a qubit and analyze the dependence of its properties on the main parameters of the superlattice: the tunnel coupling between antidots, and the probability of jumps with the spin flip.
Received: 20.07.2023 Revised: 25.07.2023 Accepted: 25.07.2023
Citation:
R. A. Niyazov, D. N. Aristov, V. Yu. Kachorovskii, “Effective Hamiltonian of topologically protected qubit in a helical crystal”, Pis'ma v Zh. Èksper. Teoret. Fiz., 118:5 (2023), 376–383; JETP Letters, 118:5 (2023), 376–383
Linking options:
https://www.mathnet.ru/eng/jetpl7034 https://www.mathnet.ru/eng/jetpl/v118/i5/p376
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Abstract page: | 47 | References: | 14 | First page: | 6 |
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