Qubit control noise spectroscopy with optimal suppression of dephasing

Vivian Maloney, Yasuo Oda, Gregory Quiroz, B. David Clader, and Leigh M. Norris
Phys. Rev. A 106, 022425 – Published 23 August 2022

Abstract

We extend quantum noise spectroscopy (QNS) of amplitude control noise to settings where dephasing noise or detuning errors make significant contributions to qubit dynamics. Previous approaches to characterize amplitude noise are limited by their vulnerability to low-frequency dephasing noise and static detuning errors, which can overwhelm the target control noise signal and introduce bias into estimates of the amplitude noise spectrum. To overcome this problem, we leverage optimal control to identify a family of amplitude control waveforms that optimally suppress low-frequency dephasing noise and detuning errors, while maintaining the spectral concentration in the amplitude filter essential for spectral estimation. The waveforms found via numerical optimization have surprisingly simple analytic forms, consisting of oscillating sine waves obeying particular amplitude and frequency constraints. In numerically simulated QNS experiments, these waveforms demonstrate superior robustness, enabling accurate estimation of the amplitude noise spectrum in regimes where existing approaches are biased by low-frequency dephasing noise and detuning errors.

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  • Received 12 May 2022
  • Accepted 25 July 2022

DOI:https://doi.org/10.1103/PhysRevA.106.022425

©2022 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Quantum Information, Science & Technology

Authors & Affiliations

Vivian Maloney1,*, Yasuo Oda2, Gregory Quiroz1,2, B. David Clader1,†, and Leigh M. Norris1

  • 1The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland 20723, USA
  • 2William H. Miller III Department of Physics & Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA

  • *Vivian.Maloney@jhuapl.edu
  • Present address: Goldman Sachs & Co.

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Issue

Vol. 106, Iss. 2 — August 2022

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