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Bulletin of the American Physical Society

A broadband reflective filter for applying dc biases to high-Q superconducting microwave cavities

Hao Yu, Francisco P. M. Rouxinol, Matthew LaHaye

Published Mar 2, 2015• 0 citations
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We present the design of a reflective stop-band filter based on quasi-lumped elements that can be utilized to introduce large dc and low-frequency voltage biases into a low-loss superconducting coplanar waveguide (CPW) cavity. Transmission measurements of the filter are seen to be in good agreement with simulations and demonstrate insertion losses greater than 20 dB20\,{\rm dB}20dB in the range of 3 to 10 GHz{\rm 3\,to\,10\,GHz}3to10GHz. Moreover, transmission measurements of the CPW's fundamental mode demonstrate that loaded quality factors exceeding 10510^5105 can be achieved with this design for dc voltages as large as 20 V{\rm 20\,V}20V and for the cavity operated in the single-photon regime. This makes the design suitable for use in a number of applications including qubit-coupled mechanical systems and circuit QED.
We report a technique for applying a dc voltage or current bias to the center conductor of a high-quality factor superconducting microwave cavity without significantly disturbing selected cavity modes. This is accomplished by incorporating dc bias lines into the cavity at specific locations. The measured S-matrix parameters of the system are in good agreement with theoretical predictions and simulations. We find that at 4 K the quality factor of the cavity degrades by less than 1% under the application of a dc bias.