Efficient estimation of resonant coupling between quantum systems

Markku P V Stenberg, Yuval R. Sanders, Frank K. Wilhelm

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We present an efficient method for the characterization of two coupled discrete quantum systems, one of which can be controlled and measured. For two systems with transition frequencies ωq, ωr, and coupling strength g we show how to obtain estimates of g and ωr whose error decreases exponentially in the number of measurement shots rather than as a power law expected in simple approaches. Our algorithm can thereby identify g and ωr simultaneously with high precision in a few hundred measurement shots. This is achieved by adapting measurement settings upon data as it is collected. We also introduce a method to eliminate erroneous estimates with small overhead. Our algorithm is robust against the presence of relaxation and typical noise. Our results are applicable to many candidate technologies for quantum computation, in particular, for the characterization of spurious two-level systems in superconducting qubits or stripline resonators.

LanguageEnglish
Article number210404
Pages1-5
Number of pages5
JournalPhysical Review Letters
Volume113
Issue number21
DOIs
Publication statusPublished - 21 Nov 2014
Externally publishedYes

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Stenberg, Markku P V ; Sanders, Yuval R. ; Wilhelm, Frank K. / Efficient estimation of resonant coupling between quantum systems. In: Physical Review Letters. 2014 ; Vol. 113, No. 21. pp. 1-5.
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Efficient estimation of resonant coupling between quantum systems. / Stenberg, Markku P V; Sanders, Yuval R.; Wilhelm, Frank K.

In: Physical Review Letters, Vol. 113, No. 21, 210404, 21.11.2014, p. 1-5.

Research output: Contribution to journalArticleResearchpeer-review

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