通过约瑟夫森元件的双光子耦合 I：利用磁场打破对称性
超导电性
2025-07-22 v3 量子物理
摘要
我们考虑一种基于对称超导量子干涉器件 (SQUID) 的耦合元件，并证明其可介导双光子相互作用。该 SQUID 以及其他由 SQUID 引起的感应相互作用可在原位关闭。我们推导了耦合谐振器与射频 SQUID 的系统哈密顿量。射频 SQUID 处于其亚稳态势阱附近，包含若干能态，充当人造原子。我们讨论了约瑟夫森对称性如何因超导环中的磁场而破缺。评估表明，双光子耦合强度可达 18 MHz，可超过耦合器中的单光子电容相互作用。
引用
@article{arxiv.2412.05016,
title = {Two-photon coupling via Josephson element I: Breaking the symmetry with magnetic fields},
author = {E. V. Stolyarov and V. L. Andriichuk and Andrii M. Sokolov},
journal= {arXiv preprint arXiv:2412.05016},
year = {2025}
}
备注
10 pages, 5 figures: In v.3, introduced changes as suggested by referees. In v.2, added more references, corrected the claim on the waveguide coupling, corrected the transmon discussion, extended conclusions, stated precisely what inductive interactions can be switched off in the abstract