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QI: Fachverband Quanteninformation

QI 6: Implementations II

QI 6.8: Vortrag

Dienstag, 10. März 2026, 12:00–12:15, BEY/0245

Spin Qubit Leapfrogging: Dynamics of shuttling electrons on top of another — •Nicklas Meineke and Guido Burkard — Faculty of Physics, University of Konstanz, 78464 Konstanz, Germany

In recent years spin shuttling has distinguished itself as a promising candidate for achieving high fidelity medium range interactions between spin qubits and presents a powerful tool for enabling scalable semiconductor spin quantum computing architectures in the future.

Modelling the process of a shuttled spin qubit encountering a stationary quantum dot, we investigate the dynamics of the (1,1)-(0,2) charge transition in a silicon double quantum dot with non-vanishing inter-valley coupling. This enables us to describe the process of the mobile electron leapfrogging over the stationary one i.e. transitioning from a (1,1,0)- to a (0,1,1)-charge state, occupying a (0,2,0) state inbetween. Here the triplets will occupy a valley excited state to circumvent Pauli-Spin-Blockade leading to a S*T0 splitting approximately equal to the valley splitting in the stationary dot. Consequently this protocol will implement an entangling gate, which can be tuned by waiting in this configuration. For the gate to be noise-resistant and controllable the valley splitting at the location of the middle dot needs to be very low. Therefore this opens up the possibility to make practical use and isolate low-valley splitting hotspots on a wafer, which would otherwise act as error sources.

Keywords: Spin qubits; Spin Shuttling; Valley Physics