Observation and calculation of higher-order sideband transitions in a flux qubit coupled to a SQUID-based resonator

27th International Conference on Low Temperature Physics

Shimazu, Y.^1 ; Shirasaki, R.^1 ; Toda, S.^1 ; Yamanashi, H.^1

Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama

240-8501, Japan^1

关键词: Calculation results;    Coupled systems;    Coupling strengths;    Quantum numbers;    Quantum-information processing;    Resonator mode;    Superconducting flux;    Transition matrix elements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/5/052030/pdf
DOI  :  10.1088/1742-6596/568/5/052030

来源: IOP

【 摘 要 】

Qubit-resonator coupled systems have been intensively studied because of their potential usefulness in quantum information processing. We investigated a superconducting flux qubit coupled to a resonator mode (SQUID plasma mode) associated with a dc SQUID used to read out the qubit state. Higher-order red and blue sideband transitions with |M| 1, 2, and 3, where M represents the change in the quantum number of the resonator state, were clearly observed away from the symmetry point. We calculated the transition matrix elements between the dressed states and examined their dependence on both the coupling strength and the flux bias for the qubit. The observation of the sidebands up to |M| 3 is consistent with the calculation results.