Optimized electrical control of a Si/SiGe spin qubit in the presence of an induced frequency shift
| Autor: | Giles Allison, Seigo Tarucha, Noritaka Usami, Jun Yoneda, Shunri Oda, Tetsuo Kodera, Tomohiro Otsuka, Takashi Nakajima, Kenta Takeda, Matthieu R. Delbecq, Kohei M. Itoh, Yusuke Hoshi |
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| Přispěvatelé: | RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Tohoku University [Sendai], Laboratoire Pierre Aigrain (LPA), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), 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)-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 Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Tokyo University of Science [Tokyo], Nagoya University, Keio University, Tokyo Institute of Technology [Tokyo] (TITECH), The University of Tokyo (UTokyo) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Coherence time
Quantum decoherence Computer Networks and Communications FOS: Physical sciences 02 engineering and technology Electron 01 natural sciences lcsh:QA75.5-76.95 [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Computer Science (miscellaneous) Hardware_ARITHMETICANDLOGICSTRUCTURES 010306 general physics Physics Condensed Matter - Mesoscale and Nanoscale Physics Spins Quantum dots business.industry Statistical and Nonlinear Physics Quantum Physics 021001 nanoscience & nanotechnology lcsh:QC1-999 Computational Theory and Mathematics Quantum dot Qubit Optoelectronics lcsh:Electronic computers. Computer science 0210 nano-technology Electric dipole spin resonance business Qubits Rabi frequency lcsh:Physics |
| Zdroj: | npj Quantum Information, Vol 4, Iss 1, Pp 1-6 (2018) npj Quantum Information npj Quantum Information, Nature, 2018, 4 (1), pp.54 (2018). ⟨10.1038/s41534-018-0105-z⟩ |
| ISSN: | 2056-6387 |
| DOI: | 10.1038/s41534-018-0105-z |
| Popis: | Electron spins confined in quantum dots are an attractive system to realize high-fidelity qubits owing to their long coherence time. With the prolonged spin coherence time, however, the control fidelity can be limited by systematic errors rather than decoherence, making characterization and suppression of their influence crucial for further improvement. Here we report that the control fidelity of Si/SiGe spin qubits can be limited by the microwave-induced frequency shift of electric dipole spin resonance and it can be improved by optimization of control pulses. As we increase the control microwave amplitude, we observe a shift of the qubit resonance frequency, in addition to the increasing Rabi frequency. We reveal that this limits control fidelity with a conventional amplitude-modulated microwave pulse below 99.8%. In order to achieve a gate fidelity >99.9%, we introduce a quadrature control method, and validate this approach experimentally by randomized benchmarking. Our finding facilitates realization of an ultra-high-fidelity qubit with electron spins in quantum dots. |
| Databáze: | OpenAIRE |
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