Presentation Information
[9p-N304-6]Perturbation Theory for Superconducting Flux Qubits in Single Well Regime
〇(D)Tokunoshin Uchida1, Hiroki Kutsuma1, Taro Yamashita1 (1.Tohoku Univ.)
Keywords:
superconducting flux qubit,quantum optics,orthogonal polynomials
Superconducting flux qubits have traditionally been described as persistent-current states in a three-junction loop with a double-well potential (two junctions of equal area and a third junction with an area reduced by a factor of α (> 0.5) compared to the others). However, recent long coherence times of flux qubits have been achieved in the single-well regime with α ≤ 0.5.
In this work, we apply degenerate perturbation theory, where the secular equation determines the energy shifts, to this single-well regime under considering small α regime. We derive its general solution using two kinds of orthogonal polynomials. Our result provides the foundation for enhancing flux qubit performance and for its application such as a coupler.
In this work, we apply degenerate perturbation theory, where the secular equation determines the energy shifts, to this single-well regime under considering small α regime. We derive its general solution using two kinds of orthogonal polynomials. Our result provides the foundation for enhancing flux qubit performance and for its application such as a coupler.