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Rotating-frame relaxation as a noise spectrum analyser of a superconducting qubit undergoing driven evolution

Author

Listed:
  • Fei Yan

    (Massachusetts Institute of Technology (MIT))

  • Simon Gustavsson

    (Research Laboratory of Electronics, MIT)

  • Jonas Bylander

    (Research Laboratory of Electronics, MIT)

  • Xiaoyue Jin

    (Research Laboratory of Electronics, MIT)

  • Fumiki Yoshihara

    (The Institute of Physical and Chemical Research (RIKEN))

  • David G. Cory

    (Massachusetts Institute of Technology (MIT)
    University of Waterloo
    Perimeter Institute for Theoretical Physics)

  • Yasunobu Nakamura

    (The Institute of Physical and Chemical Research (RIKEN)
    Research Center for Advanced Science and Technology, The University of Tokyo, Komaba)

  • Terry P. Orlando

    (Research Laboratory of Electronics, MIT)

  • William D. Oliver

    (Research Laboratory of Electronics, MIT
    MIT Lincoln Laboratory)

Abstract

Gate operations in a quantum information processor are generally realized by tailoring specific periods of free and driven evolution of a quantum system. Unwanted environmental noise, which may in principle be distinct during these two periods, acts to decohere the system and increase the gate error rate. Although there has been significant progress characterizing noise processes during free evolution, the corresponding driven-evolution case is more challenging as the noise being probed is also extant during the characterization protocol. Here we demonstrate the noise spectroscopy (0.1–200 MHz) of a superconducting flux qubit during driven evolution by using a robust spin-locking pulse sequence to measure relaxation (T1ρ) in the rotating frame. In the case of flux noise, we resolve spectral features due to coherent fluctuators, and further identify a signature of the 1 MHz defect in a time-domain spin–echo experiment. The driven-evolution noise spectroscopy complements free-evolution methods, enabling the means to characterize and distinguish various noise processes relevant for universal quantum control.

Suggested Citation

  • Fei Yan & Simon Gustavsson & Jonas Bylander & Xiaoyue Jin & Fumiki Yoshihara & David G. Cory & Yasunobu Nakamura & Terry P. Orlando & William D. Oliver, 2013. "Rotating-frame relaxation as a noise spectrum analyser of a superconducting qubit undergoing driven evolution," Nature Communications, Nature, vol. 4(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3337
    DOI: 10.1038/ncomms3337
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    Cited by:

    1. Omar Fawzi & Richard Kueng & Damian Markham & Aadil Oufkir, 2024. "Learning properties of quantum states without the IID assumption," Nature Communications, Nature, vol. 15(1), pages 1-19, December.
    2. Jonas Meinel & Vadim Vorobyov & Ping Wang & Boris Yavkin & Mathias Pfender & Hitoshi Sumiya & Shinobu Onoda & Junichi Isoya & Ren-Bao Liu & J. Wrachtrup, 2022. "Quantum nonlinear spectroscopy of single nuclear spins," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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