Broadband Microwave Isolation with Adiabatic Mode Conversion in Coupled Superconducting Transmission Lines

Abstract

We propose a traveling wave scheme for broadband microwave isolation using parametric mode conversion in conjunction with adiabatic phase matching technique in a pair of coupled nonlinear transmission lines. This scheme is compatible with the circuit quantum electrodynamics architecture (cQED) and provides isolation without introducing additional quantum noise. We first present the scheme in a general setting then propose an implementation with Josephson junction transmission lines. Numerical simulation shows more than 20 dB isolation over an octave bandwidth (4-8\,GHz) in a 2000 unit cell device with less than 0.05 dB insertion loss dominated by dielectric loss.

Main text: 8 pages, 4 figures. Supplementary material: 4 pages, 3 figures

References in corpus (5)

• Unidirectional Nonlinear PT-symmetric Optical Structures
• Analytic control methods for high fidelity unitary operations in a weakly nonlinear oscillator
• Noiseless nonreciprocity in a parametric active device
• Resonantly phase-matched Josephson junction traveling wave parametric amplifier
• Geometrical Representation of Sum Frequency Generation and Adiabatic Frequency Conversion