Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Optimization of a solid-state electron spin qubit using Gate Set Tomography

Journal Article · · New Journal of Physics
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [4];  [4]
  1. Univ. of New South Wales, Sydney, NSW (Australia); QuTech & Kavli Institute of Nanoscience, CJ Delft (The Netherlands)
  2. Univ. of New South Wales, Sydney, NSW (Australia); FOM Institute AMOLF, Amsterdam (The Netherlands)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. Univ. of New South Wales, Sydney, NSW (Australia)
  5. Univ. of New South Wales, Sydney, NSW (Australia); Simon Fraser Univ., Burnaby, BC (Canada)
+ Show Author Affiliations

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.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1325155
Alternate ID(s):
OSTI ID: 1328807; OSTI ID: 1328808; OSTI ID: 22871394
Report Number(s):
SAND--2016-4786J; {640506,"Journal ID: ISSN 1367-2630"}
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 10 Vol. 18; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

Similar Records

Related Subjects

97
quantum computing
silicon
tomography