Advanced materials research

Crosstalk between Nb Superconducting Coplanar Waveguide Resonators

Na Zhao, Jianshe Liu, Hu Zhao, Hao Li, Tie Fu Li, Wei Chen

Published Jun 1, 2012• 1 citation

Abstract

Nb based superconducting coplanar waveguide resonators on oxidized silicon wafer were fabricated and characterized at different temperatures. Crosstalk between two single resonators fabricated on the same chip was observed. When microwave signal is sent to the input of either resonator, output from both resonators show almost the same resonant frequency and similar quality factors.

DOI: 10.4028/www.scientific.net/amr.542-543.653

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Advanced materials research

Crosstalk between Nb Superconducting Coplanar Waveguide Resonators

Na Zhao, Jianshe Liu, Hu Zhao, Hao Li, Tie Fu Li, Wei Chen

Published Jun 1, 2012• 1 citation

Publisher

Abstract

DOI: 10.4028/www.scientific.net/amr.542-543.653

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Q_{i}

) decreases from

Q_{i}\sim 1.07\times 10^{6}

in a high power regime to

Q_{i}\sim 1.36\times 10^{5}

in the single photon regime. Data from this study is consistent with the TLS theory, which describes the TLS interactions in resonator substrates and interfaces. Moreover, we study the temperature (

T

) dependence of

Q_{i}

and resonance frequency

f_{r}

of coplanar waveguide resonators to characterize the quasiparticle density. We observe that the increase in kinetic inductance at higher temperatures is the main reason for the frequency shift. Finally, we measure

f_{r}

and

Q_{i}

in response to in-plane magnetic fields (

B_{||}

). We verify that

Q_{i}

stays well above

10^{4}

up to

B_{||}

= 240 mT in the photon number

< \! n_{ph} \! >

= 1.8 at

T

= 100 mK. Our results could enable the development of robust microwave superconducting circuits for circuit quantum electrodynamics at high magnetic fields required for hybrid superconducting-semiconducting quantum circuits.

5.6\times{10}^{3}

, and the other is

4.0\times{10}^{4}

. The measured data are fitted well by classical ABCD matrix approach. We found that the transmission peak deviates from the standard Lorentizian with a frequency broadening.