期刊
NEW JOURNAL OF PHYSICS
卷 18, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/18/10/103018
关键词
quantum computing; silicon; tomography
资金
- Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology [CE110001027]
- US Army Research Office [W911NF-13-1-0024]
- Australian National Fabrication Facility
- US Department of Energys National Nuclear Security Administration [DE-AC04-94AL85000]
- Sandia National Laboratories Truman Fellowship Program - Laboratory Directed Research and Development (LDRD) program
State of the art qubit systems are reaching the gate fidelities required for scalable quantum computation architectures. Further improvements in the fidelity of quantum gates demands characterization and benchmarking protocols that are efficient, reliable and extremely accurate. Ideally, a benchmarking protocol should also provide information on how to rectify residual errors. Gate set tomography (GST) is one such protocol designed to give detailed characterization of as-built qubits. Weimplemented GST on a high-fidelity electron-spin qubit confined by a single P-31 atom in Si-28. The results reveal systematic errors that a randomized benchmarking analysis could measure but not identify, whereas GST indicated the need for improved calibration of the length of the control pulses. After introducing this modification, we measured a new benchmark average gate fidelity of 99.942(8)%, an improvement on the previous value of 99.90(2)%. Furthermore, GST revealed high levels of non-Markovian noise in the system, which will need to be understood and addressed when the qubit is used within a fault-tolerant quantum computation scheme.
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