Understanding Magnetic Hose

Abstract

Abhijit Bhattacharyya

Fast magnetic flux control is important for circuit quantum electrodynamics (cQED) to control qubit precisely. The 3D superconducting microwave resonators posses higher volumes turning them to insensitive to surface dielectric losses resulting in higher Q values in comparison to 2D resonators which have higher dissipation due to surface losses. Thus 3D resonators increase the decoherence time. Although this makes a strong reason to opt for 3D superconducting resonators while it is difficult to tune the qubit using fast magnetic field accurately from outside the 3D resonator. In this paper, we try to understand transporting the magnetic filed inside a cylindrical superconducting cavity implementing a cylindrical magnetic hose using finite element analysis.

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