Randomized benchmarking of quantum gates implemented by electron spin resonance

Daniel K. Park, Guanru Feng, Robabeh Rahimi, Jonathan Baugh, Raymond Laflamme

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Spin systems controlled and probed by magnetic resonance have been valuable for testing the ideas of quantum control and quantum error correction. This paper introduces an X-band pulsed electron spin resonance spectrometer designed for high-fidelity coherent control of electron spins, including a loop-gap resonator for sub-millimeter sized samples with a control bandwidth ∼40 MHz. Universal control is achieved by a single-sideband upconversion technique with an I-Q modulator and a 1.2 GS/s arbitrary waveform generator. A single qubit randomized benchmarking protocol quantifies the average errors of Clifford gates implemented by simple Gaussian pulses, using a sample of gamma-irradiated quartz. Improvements in unitary gate fidelity are achieved through phase transient correction and hardware optimization. A preparation pulse sequence that selects spin packets in a narrowed distribution of static fields confirms that inhomogeneous dephasing (1/T2∗) is the dominant source of gate error. The best average fidelity over the Clifford gates obtained here is 99.2%, which serves as a benchmark to compare with other technologies.

Original languageEnglish
Pages (from-to)68-78
Number of pages11
JournalJournal of Magnetic Resonance
Volume267
DOIs
Publication statusPublished - 2016 Jun 1

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Inc. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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