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Abstract
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.
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1 RIKEN, Center for Emergent Matter Science (CEMS), Saitama, Japan
2 RIKEN, Center for Emergent Matter Science (CEMS), Saitama, Japan; JST, PRESTO, Saitama, Japan; Research Institute of Electrical Communication, Tohoku University, Sendai, Japan
3 RIKEN, Center for Emergent Matter Science (CEMS), Saitama, Japan; Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, Paris Cedex 05, France
4 Advanced Research Laboratories, Tokyo City University, Tokyo, Japan
5 Graduate School of Engineering, Nagoya University, Nagoya, Japan
6 Department of Applied Physics and Physico-Informatics, Keio University, Yokohama, Japan
7 Department of Physical Electronics and Quantum Nanoelectronics Research Center, Tokyo Institute of Technology, Tokyo, Japan
8 Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, Tokyo, Japan
9 RIKEN, Center for Emergent Matter Science (CEMS), Saitama, Japan; Department of Applied Physics, The University of Tokyo, Tokyo, Japan