A Superconducting 180° Hybrid Ring Coupler for circuit Quantum Electrodynamics

Details A Superconducting 180° Hybrid Ring Coupler for circuit Quantum Electrodynamics A Superconducting 180° Hybrid Ring Coupler for circuit Quantum Electrodynamics

2010-09-29

arxiv.org/abs/1009.5879v1

Appl. Phys. Lett. 97, 222508 (2010)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1063/1.3522650

Superconducting circuit quantum electrodynamics experiments with propagating microwaves require devices acting as beam splitters. Using niobium thin films on silicon and sapphire substrates, we fabricated superconducting 180{\deg} microstrip hybrid ring couplers, acting as beam splitters with center frequencies of about 6GHz. For the magnitude of the coupling and isolation we find -3.5+/-0.5dB and at least -15dB, respectively, in a bandwidth of 2GHz. We also investigate the effect of reflections at the superconductor-normal conductor contact by means of low temperature laser scanning microscopy. Our measurements show that our hybrid rings are well suited for on-chip applications in circuit quantum electrodynamics experiments.

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