Coherence of a driven electron spin qubit actively decoupled from quasi-static noise
| Autor: | Tomohiro Otsuka, Giles Allison, Jun Yoneda, Matthieu R. Delbecq, Andreas D. Wieck, Daniel Loss, Takashi Nakajima, Shinichi Amaha, Akito Noiri, Kento Kawasaki, Peter Stano, Kenta Takeda, Arne Ludwig, Seigo Tarucha |
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| Přispěvatelé: | RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Tokyo University of Science [Tokyo], Slovak Academy of Sciences (SAS), Physique Mésoscopique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Ruhr University Bochum (RUB), Ruhr-Universität Bochum [Bochum], University of Basel (Unibas), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) |
| Rok vydání: | 2020 |
| Předmět: |
Coherence time
Boosting (machine learning) III-V semiconductors QC1-999 media_common.quotation_subject Feedback control General Physics and Astronomy Fidelity FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Quantum mechanics Electron spin resonance 0103 physical sciences Quantum computation Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Quantum information with solid state qubits Hardware_ARITHMETICANDLOGICSTRUCTURES [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 010306 general physics media_common Physics Quantum Physics Hardware_MEMORYSTRUCTURES Condensed Matter - Mesoscale and Nanoscale Physics Quantum dots Lithography Quantum Information Dilution refrigerator Quantum control Spintronics Condensed Matter Physics 3. Good health Spin coherence Qubit Quantum Information Quantum Physics (quant-ph) Quasistatic process Coherence (physics) |
| Zdroj: | Physical Review X Physical Review X, American Physical Society, 2020, 10, pp.011060. ⟨10.1103/PhysRevX.10.011060⟩ Physical Review X, Vol 10, Iss 1, p 011060 (2020) |
| ISSN: | 2160-3308 |
| DOI: | 10.48550/arxiv.2001.02884 |
| Popis: | The coherence of electron spin qubits in semiconductor quantum dots suffers mostly from low-frequency noise. During the last decade, efforts have been devoted to mitigate such noise by material engineering, leading to substantial enhancement of the spin dephasing time for an idling qubit. However, the role of the environmental noise during spin manipulation, which determines the control fidelity, is less understood. We demonstrate an electron spin qubit whose coherence in the driven evolution is limited by high-frequency charge noise rather than the quasi-static noise inherent to any semiconductor device. We employed a feedback control technique to actively suppress the latter, demonstrating a $\pi$-flip gate fidelity as high as $99.04\pm 0.23\,\%$ in a gallium arsenide quantum dot. We show that the driven-evolution coherence is limited by the longitudinal noise at the Rabi frequency, whose spectrum resembles the $1/f$ noise observed in isotopically purified silicon qubits. Comment: 10 pages, 7 figures |
| Databáze: | OpenAIRE |
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