title: Efficient estimation of resonant coupling between quantum systems.
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.
authors.affiliation: Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany.
authors.forename: Markku P V
authors.initials: MP
authors.lastname: Stenberg
authors.affiliation: IQC and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Yuval R
authors.initials: YR
authors.lastname: Sanders
authors.affiliation: Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany and IQC and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Frank K
authors.initials: FK
authors.lastname: Wilhelm