2014/07/31 by Markku P. V. Stenberg, Yuval R. Sanders, Frank K. Wilhelm
Computer Science · Physics and Astronomy · #Computer science #Coupling (piping) #Estimation #Materials science #Physics #Quantum #Quantum Information and Cryptography #Quantum mechanics #Quantum optics and atomic interactions #Spectroscopy and Quantum Chemical Studies #Statistical physics #Systems engineering #quant-ph
paper · pdf · doi:10.1103/physrevlett.113.210404
published as Phys. Rev. Lett. 113, 210404 (2014) · 5 pages, 4 figures, and supplemental material
arxiv created 2014/11/04 · openalex publication_date 2014/11/21 · arxiv updated 2017/01/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.