Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

QI: Fachverband Quanteninformation

QI 3: Semiconductor Spin Qubits I: Silicon

QI 3.4: Vortrag

Montag, 10. März 2025, 12:00–12:15, HS II

Landau Zener Stückelberg Majorana Interferometry for valley states in conveyor-mode spin-shuttler — •Priyanka Yashwantrao^1,2, Alessandro David¹, Tommaso Calarco^1,3,4, and Felix Motzoi^1,3 — ¹PGI-8, FZJ, Jülich, Germany — ²Universität Bonn, Bonn, Germany — ³THP, Universität Köln, Köln, Germany — ⁴University of Bologna, Bologna, Italy

Spin-shuttling devices coherently transport the spin state of a solid-state charge carrier for tens of micrometers, enabling the scalability of semiconductor quantum processors as in the proposed SpinBus architecture [1]. In Si/SiGe heterostructure the transport fidelity is deteriorated by the presence of valley [2] which depends on the atomic arrangement. The information about spacial distribution of valley splitting and eigenstate orientation would help to perform better transport experiments. Although it is currently possible to measure the valley splitting [3], this information is not complete as valley models [4] predict the orientation of the eigenstates to be a sequence of non-linear avoided crossings. In this work, we simulate numerically the technique of ’LZSM Interferometry’ [5] to predict the valley behavior along a spin-shuttler. The excited valley population is studied as a function of position, amplitude and frequency. We elaborate on techniques to characterize and extract information about the valley Hamiltonian.

[1] Künne et al., Nat Commun 15, 4977 (2024) [2] Zwanenburg et al., Rev. Mod. Phys. 85, 961 (2013) [3] Volmer et al., npj Quantum Inf 10, 61 (2024) [4] Wuetz et al., Nat Commun 13, 7730 (2022) [5] Shevchenko, et al., Phys. Rept. 492, 1 (2010)

Keywords: spin transport; scalability; valley states characterization; quantum dots