期刊
SCIENCE ADVANCES
卷 8, 期 36, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abq0455
关键词
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资金
- Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology [CE170100012]
- Silicon Quantum Computing Pty Ltd.
- Australian Research Council Laureate Fellowship
This research demonstrates an initialization and measurement technique based on voltage ramps, which enables high-fidelity electron spin readout at higher temperatures. This technique requires lower energy and offers practical benefits such as real-time dynamic feedback and minimal alignment procedures.
State preparation and measurement of single-electron spin qubits typically rely on spin-to-charge conversion where a spin-dependent charge transition of the electron is detected by a coupled charge sensor. For high-fidelity, fast readout, this process requires that the qubit energy is much larger than the temperature of the system limiting the temperature range for measurements. Here, we demonstrate an initialization and measurement technique that involves voltage ramps rather than static voltages allowing us to achieve state-to-charge readout fidelities above 99% for qubit energies almost half that required by traditional methods. This previously unidentified measurement technique is highly relevant for achieving high-fidelity electron spin readout at higher temperature operation and offers a number of pragmatic benefits compared to traditional energy-selective readout such as real-time dynamic feedback and minimal alignment procedures.
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