تقرير
Optimization of a solid-state electron spin qubit using Gate Set Tomography
| العنوان: | Optimization of a solid-state electron spin qubit using Gate Set Tomography |
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| المؤلفون: | Dehollain, Juan P., Muhonen, Juha T., Blume-Kohout, Robin, Rudinger, Kenneth M., Gamble, John King, Nielsen, Erik, Laucht, Arne, Simmons, Stephanie, Kalra, Rachpon, Dzurak, Andrew S., Morello, Andrea |
| المصدر: | New Journal of Physics 18, 103018 (2016) |
| سنة النشر: | 2016 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Quantum Physics |
| الوصف: | 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. We implemented GST on a high-fidelity electron-spin qubit confined by a single $^{31}$P atom in $^{28}$Si. 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. Comment: 14 pages, 4 figures. v2: Updated references and included ancillary files |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/1367-2630/18/10/103018 |
| URL الوصول: | http://arxiv.org/abs/1606.02856 |
| رقم الأكسشن: | edsarx.1606.02856 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/1367-2630/18/10/103018 |
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