Multi-level quantum noise spectroscopy

Youngkyu Sung (), Antti Vepsäläinen, Jochen Braumüller, Fei Yan, Joel I-Jan Wang, Morten Kjaergaard, Roni Winik, Philip Krantz, Andreas Bengtsson, Alexander J. Melville, Bethany M. Niedzielski, Mollie E. Schwartz, David K. Kim, Jonilyn L. Yoder, Terry P. Orlando, Simon Gustavsson and William D. Oliver ()
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Youngkyu Sung: Research Laboratory of Electronics, Massachusetts Institute of Technology
Antti Vepsäläinen: Research Laboratory of Electronics, Massachusetts Institute of Technology
Jochen Braumüller: Research Laboratory of Electronics, Massachusetts Institute of Technology
Fei Yan: Research Laboratory of Electronics, Massachusetts Institute of Technology
Joel I-Jan Wang: Research Laboratory of Electronics, Massachusetts Institute of Technology
Morten Kjaergaard: Research Laboratory of Electronics, Massachusetts Institute of Technology
Roni Winik: Research Laboratory of Electronics, Massachusetts Institute of Technology
Philip Krantz: Research Laboratory of Electronics, Massachusetts Institute of Technology
Andreas Bengtsson: Research Laboratory of Electronics, Massachusetts Institute of Technology
Alexander J. Melville: MIT Lincoln Laboratory
Bethany M. Niedzielski: MIT Lincoln Laboratory
Mollie E. Schwartz: MIT Lincoln Laboratory
David K. Kim: MIT Lincoln Laboratory
Jonilyn L. Yoder: MIT Lincoln Laboratory
Terry P. Orlando: Research Laboratory of Electronics, Massachusetts Institute of Technology
Simon Gustavsson: Research Laboratory of Electronics, Massachusetts Institute of Technology
William D. Oliver: Research Laboratory of Electronics, Massachusetts Institute of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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: 2021
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DOI: 10.1038/s41467-021-21098-3

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