Broadband architecture for galvanically accessible superconducting microwave resonators

Abstract

In many hybrid quantum systems, a superconducting circuit is required that combines DC-control with a coplanar waveguide (CPW) microwave resonator. The strategy thus far for applying a DC voltage or current bias to microwave resonators has been to apply the bias through a symmetry point in such a way that it appears as an open circuit for certain frequencies. Here, we introduce a microwave coupler for superconducting CPW cavities in the form of a large shunt capacitance to ground. Such a coupler acts as a broadband mirror for microwaves while providing galvanic connection to the center conductor of the resonator. We demonstrate this approach with a two-port $\lambda /4$-transmission resonator with linewidths in the MHz regime ($Q\sim 10^3$) that shows no spurious resonances and apply a voltage bias up to $80$ V without affecting the quality factor of the resonator. This resonator coupling architecture, which is simple to engineer, fabricate and analyse, could have many potential applications in experiments involving superconducting hybrid circuits.

15 pages, 12 figures

References in corpus (11)

• Amplification and squeezing of quantum noise with a tunable Josephson metamaterial
• Circuit Quantum Electrodynamics with a Spin Qubit
• Semiconductor double quantum dot micromaser
• Quantum-enabled temporal and spectral mode conversion of microwave signals
• Coupling carbon nanotube mechanics to a superconducting circuit
• Clean carbon nanotubes coupled to superconducting impedance-matching circuits
• Introduction of a DC Bias into a High-Q Superconducting Microwave Cavity
• Molybdenum-Rhenium alloy based high-$Q$ superconducting microwave resonators
• Spectrum of Andreev Bound States in a Molecule Embedded Inside a Microwave-Excited Superconducting Junction
• Broadband architecture for galvanically accessible superconducting microwave resonators
• Development of a broadband reflective T-filter for voltage biasing high-Q superconducting microwave cavities

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• Improving superconducting resonators in magnetic fields by reduced field-focussing and engineered flux screening
• Broadband architecture for galvanically accessible superconducting microwave resonators
• Nonlinear Properties of Supercurrent-Carrying Single and Multi-Layer Thin-Film Superconductors
• A split-cavity design for the incorporation of a DC bias in a 3D microwave cavity
• An optomechanical platform with a 3-dimensional waveguide cavity
• Current detection using a Josephson parametric upconverter
• Suppressed-gap millimetre wave kinetic inductance detectors using DC-bias current
• A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms