期刊
PHYSICAL REVIEW A
卷 99, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.99.042310
关键词
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资金
- Ministry of Science and Technology of Taiwan [MOST 106-2112-M-002-013-MY3, MOST 107-2622-8-002-018, MOST 107-2627-E-002-002]
- National Taiwan University [NTU-CC-107L892902, NTU-CC-108L893202]
- thematic group program of the National Center for Theoretical Sciences, Taiwan
- Australian Research Council [CE170100012]
- US Army Research Office [W911NF-17-1-0198]
A two-qubit controlled-NOT (CNOT) gate, realized by a controlled-phase (C-phase) gate combined with single-qubit gates, has been experimentally implemented recently for quantum-dot spin qubits in isotopically enriched silicon, a promising solid-state system for practical quantum computation. In the experiments, the single-qubit gates have been demonstrated with fault-tolerant control fidelity, but the infidelity of the two-qubit C-phase gate is, primarily due to the electrical noise, still higher than the required error threshold for fault-tolerant quantum computation (FTQC). Here, by taking the realistic system parameters and the experimental constraints on the control pulses into account, we construct experimentally realizable high-fidelity CNOT gates robust against electrical noise with the experimentally measured 1/f(1.01) noise spectrum and also against the uncertainty in the interdot tunnel coupling amplitude. Our fine-tuned optimal CNOT gate has about two orders of magnitude improvement in gate infidelity over the ideal C-phase gate constructed without considering any noise effect. Furthermore, within the same control framework, high-fidelity and robust single-qubit gates can also be constructed, paving the way for large-scale FTQC.
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