期刊
NPJ QUANTUM INFORMATION
卷 8, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41534-022-00539-x
关键词
-
类别
资金
- German Federal Ministry of Education and Research within the funding program Photonic Research Germany [13N14891]
- German Federal Ministry of Education and Research within the funding program Quantum Technologies - From Basic Research to the Market (project GeQCoS) [13N15685]
- EU [820363]
Quantum circuit theory is a powerful tool for predicting the dynamics of superconducting circuits. This study proposes a general method to construct a low-energy Hamiltonian based on the circuit geometry and the solution of external magnetic fields, revealing the rich dynamics resulting from the interplay between geometry and field distribution.
Quantum circuit theory has become a powerful and indispensable tool to predict the dynamics of superconducting circuits. Surprisingly however, the question of how to properly account for a time-dependent driving via external magnetic fields has hardly been addressed so far. Here, we derive a general recipe to construct a low-energy Hamiltonian, taking as input only the circuit geometry and the solution of the external magnetic fields. We find that the interplay of geometry and field distribution leads to a much richer circuit dynamics than commonly anticipated, already in devices as simple as the superconducting quantum interference device (SQUID). These dynamics can be captured by assigning negative, time-dependent or even momentarily singular capacitances to the Josephson junctions. Negative capacitances give rise to a strong enhancement of the qubit relaxation rates, while time-dependent capacitances lead to a finite Berry phase.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据