A tunable coupler for superconducting microwave resonators using a nonlinear kinetic inductance transmission line

C. Bockstiegel; Y. Wang; M. R. Vissers; L. F. Wei; S. Chaudhuri; J. Hubmayr; J. Gao

doi:10.1063/1.4953209

A tunable coupler for superconducting microwave resonators using a nonlinear kinetic inductance transmission line

C. Bockstiegel, Y. Wang, M. R. Vissers, L. F. Wei, S. Chaudhuri, J. Hubmayr, J. Gao

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

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-Ω 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 Qc∼5.5×104 and Qc∼2.3×106, 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.

Original language	English (US)
Article number	222604
Journal	Applied Physics Letters
Volume	108
Issue number	22
DOIs	https://doi.org/10.1063/1.4953209
State	Published - May 30 2016
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4953209

Cite this

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title = "A tunable coupler for superconducting microwave resonators using a nonlinear kinetic inductance transmission line",

abstract = "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-Ω 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 Qc. We have demonstrated Qc tuning over a factor of 40, between Qc∼5.5×104 and Qc∼2.3×106, 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.",

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AU - Bockstiegel, C.

AU - Wang, Y.

AU - Vissers, M. R.

AU - Wei, L. F.

AU - Chaudhuri, S.

AU - Hubmayr, J.

AU - Gao, J.

PY - 2016/5/30

Y1 - 2016/5/30

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AB - 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-Ω 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 Qc. We have demonstrated Qc tuning over a factor of 40, between Qc∼5.5×104 and Qc∼2.3×106, 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.

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A tunable coupler for superconducting microwave resonators using a nonlinear kinetic inductance transmission line

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