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Title: Optimization of a solid-state electron spin qubit using gate set tomography

Abstract

Here, 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 31P atom in 28Si. 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.

Authors:
ORCiD logo; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1328807
Alternate Identifier(s):
OSTI ID: 1325155; OSTI ID: 1328808
Report Number(s):
SAND-2016-4786J
Journal ID: ISSN 1367-2630
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 18 Journal Issue: 10; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; quantum computing; silicon; tomography

Citation Formats

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., and Morello, Andrea. Optimization of a solid-state electron spin qubit using gate set tomography. United Kingdom: N. p., 2016. Web. doi:10.1088/1367-2630/18/10/103018.
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. Optimization of a solid-state electron spin qubit using gate set tomography. United Kingdom. doi:10.1088/1367-2630/18/10/103018.
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., and Morello, Andrea. Sat . "Optimization of a solid-state electron spin qubit using gate set tomography". United Kingdom. doi:10.1088/1367-2630/18/10/103018.
@article{osti_1328807,
title = {Optimization of a solid-state electron spin qubit using gate set tomography},
author = {Dehollain, Juan P. and Muhonen, Juha T. and Blume-Kohout, Robin and Rudinger, Kenneth M. and Gamble, John King and Nielsen, Erik and Laucht, Arne and Simmons, Stephanie and Kalra, Rachpon and Dzurak, Andrew S. and Morello, Andrea},
abstractNote = {Here, 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 31P atom in 28Si. 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.},
doi = {10.1088/1367-2630/18/10/103018},
journal = {New Journal of Physics},
number = 10,
volume = 18,
place = {United Kingdom},
year = {2016},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1088/1367-2630/18/10/103018

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Cited by: 3 works
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