Multi-level quantum noise spectroscopy
Author(s)
Sung, Youngkyu; Vepsäläinen, Antti; Braumüller, Jochen; Yan, Fei; Wang, Joel I-Jan; Kjaergaard, Morten; Winik, Roni; Krantz, Philip; Bengtsson, Andreas; Melville, Alexander J.; Niedzielski, Bethany M.; Schwartz, Mollie E.; Kim, David K.; Yoder, Jonilyn L.; Orlando, Terry P.; Gustavsson, Simon; Oliver, William D.; ... Show more Show less
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Abstract
System noise identification is crucial to the engineering of robust quantum systems. Although existing quantum noise spectroscopy (QNS) protocols measure an aggregate amount of noise affecting a quantum system, they generally cannot distinguish between the underlying processes that contribute to it. Here, we propose and experimentally validate a spin-locking-based QNS protocol that exploits the multi-level energy structure of a superconducting qubit to achieve two notable advances. First, our protocol extends the spectral range of weakly anharmonic qubit spectrometers beyond the present limitations set by their lack of strong anharmonicity. Second, the additional information gained from probing the higher-excited levels enables us to identify and distinguish contributions from different underlying noise mechanisms.
Date issued
2021-02-11Department
Massachusetts Institute of Technology. Research Laboratory of Electronics; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Lincoln Laboratory; Massachusetts Institute of Technology. Department of PhysicsJournal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Sung, Y., Vepsäläinen, A., Braumüller, J. et al. Multi-level quantum noise spectroscopy. Nat Commun 12, 967 (2021)
Version: Final published version
ISSN
2041-1723
Keywords
General Physics and Astronomy, General Biochemistry, Genetics and Molecular Biology, General Chemistry