| Autor: |
Hansen, Ingvild, Seedhouse, Amanda E., Chan, Kok Wai, Hudson, Fay, Itoh, Kohei M., Laucht, Arne, Saraiva, Andre, Yang, Chih Hwan, Dzurak, Andrew S. |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Applied Physics Reviews 9, 031409 (2022) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1063/5.0096467 |
| Popis: |
Quantum computing based on spins in the solid state allows for densely-packed arrays of quantum bits. While high-fidelity operation of single qubits has been demonstrated with individual control pulses, the operation of large-scale quantum processors requires a shift in paradigm towards global control solutions. Here we report the experimental implementation of a new type of qubit protocol - the SMART (Sinusoidally Modulated, Always Rotating and Tailored) protocol. As with a dressed qubit, we resonantly drive a two-level system with a continuous microwave field, but here we add a tailored modulation to the dressing field to achieve increased robustness to detuning noise and microwave amplitude fluctuations. We implement this new protocol to control a single spin confined in a silicon quantum dot and confirm the optimal modulation conditions predicted from theory. Universal control of a single qubit is demonstrated using modulated Stark shift control via the local gate electrodes. We measure an extended coherence time of $2$ ms and an average Clifford gate fidelity $>99$ $\%$ despite the relatively long qubit gate times ($>15$ $\unicode[serif]{x03BC}$s, $20$ times longer than a conventional square pulse gate), constituting a significant improvement over a conventional spin qubit and a dressed qubit. This work shows that future scalable spin qubit arrays could be operated using global microwave control and local gate addressability, while maintaining robustness to relevant experimental inhomogeneities. |
| Databáze: |
arXiv |
| Externí odkaz: |
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