Maria Spethmann

march, 2023

31mar2:00 pm3:30 pmMaria SpethmannUniversity of Basel2:00 pm - 3:30 pm KST

Event Details

Maria Spethmann

Affiliation: University of Basel

Title: High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits


Hybrid systems comprising superconducting and semiconducting materials are promising architectures for quantum computing. Superconductors induce interactions between the spin degrees of freedom of semiconducting quantum dots, based on crossed Andreev processes. In the talk I will present our theory where we show that these interactions are widely anisotropic when the semiconductor material has strong spin-orbit interactions. This anisotropy is tunable and enables fast and high-fidelity two-qubit gates between singlet-triplet spin qubits. The reason is that the design is immune to leakage into non-computational states and removes always-on  interactions between the qubits (crosstalk). We estimate two-qubit gate fidelities exceeding 99.9% without fine-tuning of parameters.


(Friday) 2:00 pm - 3:30 pm

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