Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4953209
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Funding
- National Natural Science Foundation [61301031]
- Fundamental Research Funds for the Central Universities [2682014CX087]
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We present a tunable coupler scheme that allows us to tune the coupling strength between a feedline and a superconducting resonator in situ over a wide range. In this scheme, we shunt the feedline with a 50-Omega lumped-element nonlinear transmission line made from a 20 nm NbTiN film. By injecting a DC current, the nonlinear kinetic inductance changes and the effective impedance shunting the resonator periodically varies from a short to an open, which tunes the coupling strength and coupling quality factor Q(c). We have demonstrated Q(c) tuning over a factor of 40, between Q(c) similar to 5.5 x 10(4) and Qc similar to 2.3 x 10(6), for a 4.5 GHz resonator by applying a DC current less than 3.3 mA. Our tunable coupler scheme is easy to implement and may find broad applications in superconducting detector and quantum computing/information experiments. Published by AIP Publishing.
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