Dresden 2026 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 6: Implementations II
QI 6.6: Vortrag
Dienstag, 10. März 2026, 11:30–11:45, BEY/0245
The flopping-mode exchange-only spin qubit — •Simon Stastny1 and Guido Burkard2 — 1Universität Konstanz, Konstanz, Germany — 2Universität Konstanz, Konstanz, Germany
Electron or hole spin qubits in quantum dots coupled to a microwave cavity are an established platform to realize spin qubits. One promising qubit is the exchange-only spin qubit, that allows for full baseband control, without magnetic fields. In this work we propose a spin qubit, that couples exchange-only qubit states to a cavity by adding a charge degree of freedom to the established three dot exchange-only qubit. The proposed qubit is a generalized flopping mode qubit: It comprises four quantum dots with three electrons, operating near the (0,1,1,1)↔ (1,0,1,1)↔(1,1,0,1) charge transition. The qubit as well as its resulting transversal and longitudinal spin photon couplings allow for full baseband control. the couplings and quasi static noise of the qubit are analyzed. We find dephasing times exceeding the estimated gates times, thus the proposed qubit is a promising system to realize baseband-controlled resonator-mediated (longitudinal) two qubit gates.
Keywords: Spin photon coupling; Exchange-only; Singlet-triplet; microwave cavity