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Amplitude and frequency sensing of microwave fields with a superconducting transmon qudit

Kristen, M. ORCID iD icon 1; Schneider, A. 1; Stehli, A. 1; Wolz, T. 1; Danilin, S.; Ku, H. S.; Long, J.; Wu, X.; Lake, R.; Pappas, D. P.; Ustinov, A. V. 1; Weides, M. 1
1 Physikalisches Institut (PHI), Karlsruher Institut für Technologie (KIT)


Experiments with superconducting circuits require careful calibration of the applied pulses and fields over a large frequency range. This remains an ongoing challenge as commercial semiconductor electronics are not able to probe signals arriving at the chip due to its cryogenic environment. Here, we demonstrate how the on-chip amplitude and frequency of a microwave signal can be inferred from the ac Stark shifts of higher transmon levels. In our time-resolved measurements we employ Ramsey fringes, allowing us to detect the amplitude of the systems transfer function over a range of several hundreds of MHz with an energy sensitivity on the order of 10−4. Combined with similar measurements for the phase of the transfer function, our sensing method can facilitate pulse correction for high fidelity quantum gates in superconducting circuits. Additionally, the potential to characterize arbitrary microwave fields promotes applications in related areas of research, such as quantum optics or hybrid microwave systems including photonic, mechanical or magnonic subsystems.

Verlagsausgabe §
DOI: 10.5445/IR/1000122135
Veröffentlicht am 27.07.2020
DOI: 10.1038/s41534-020-00287-w
Zitationen: 17
Zitationen: 18
Cover der Publikation
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2056-6387
KITopen-ID: 1000122135
Erschienen in npj Quantum information
Verlag Nature Research
Band 6
Heft 1
Seiten 57
Vorab online veröffentlicht am 25.06.2020
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