Optimal gauge for the multimode Rabi model in circuit QED
In circuit QED, a Rabi model can be derived by truncating the Hilbert space of an anharmonic qubit coupled to a resonator. This truncation breaks the gauge invariance present in the full Hamiltonian. Here we derive a simple criterion for an optimal gauge such that the differences between the truncat...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
American Physical Society
2019-11-01
|
Series: | Physical Review Research |
Online Access: | http://doi.org/10.1103/PhysRevResearch.1.033128 |