Kavli Affiliate: Menno Veldhorst
| First 5 Authors: Chien-An Wang, Valentin John, Hanifa Tidjani, Cécile X. Yu, Alexander S. Ivlev
| Summary:
Qubits that can be efficiently controlled are essential for the development
of scalable quantum hardware. While resonant control is used to execute
high-fidelity quantum gates, the scalability is challenged by the integration
of high-frequency oscillating signals, qubit crosstalk and heating. Here, we
show that by engineering the hopping of spins between quantum dots with
site-dependent spin quantization axis, quantum control can be established with
discrete signals. We demonstrate hopping-based quantum logic and obtain
single-qubit gate fidelities of 99.97%, coherent shuttling fidelities of
99.992% per hop, and a two-qubit gate fidelity of 99.3%, corresponding to
error rates that have been predicted to allow for quantum error correction. We
also show that hopping spins constitute a tuning method by statistically
mapping the coherence of a 10-quantum dot system. Our results show that dense
quantum dot arrays with sparse occupation could be developed for efficient and
high-connectivity qubit registers.
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