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.
| Language | English |
|---|---|
| Article number | 210404 |
| Pages | 1-5 |
| Number of pages | 5 |
| Journal | Physical Review Letters |
| Volume | 113 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - 21 Nov 2014 |
| Externally published | Yes |
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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 journal › Article › Research › peer-review
TY - JOUR
T1 - Efficient estimation of resonant coupling between quantum systems
AU - Stenberg, Markku P V
AU - Sanders, Yuval R.
AU - Wilhelm, Frank K.
PY - 2014/11/21
Y1 - 2014/11/21
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84915746948&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.113.210404
DO - 10.1103/PhysRevLett.113.210404
M3 - Article
VL - 113
SP - 1
EP - 5
JO - Physical Review Letters
T2 - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 21
M1 - 210404
ER -