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Closed-loop control of a GaAs-based singlet-triplet spin qubit with 99.5% gate fidelity and low leakage

Cerfontaine, Pascal ; Botzem, Tim ; Ritzmann, Julian ; Humpohl, Simon Sebastian ; Ludwig, Arne ; Schuh, Dieter ; Bougeard, Dominique ; Wieck, Andreas D. ; Bluhm, Hendrik



Abstract

Semiconductor spin qubits have recently seen major advances in coherence time and control fidelities, leading to a single-qubit performance that is on par with other leading qubit platforms. Most of this progress is based on microwave control of single spins in devices made of isotopically purified silicon. For controlling spins, the exchange interaction is an additional key ingredient which ...

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