A split-cavity design for the incorporation of a DC bias in a 3D microwave cavity

Abstract

We report on a technique for applying a DC bias in a 3D microwave cavity. We achieve this by isolating the two halves of the cavity with a dielectric and directly using them as DC electrodes. As a proof of concept, we embed a variable capacitance diode in the cavity and tune the resonant frequency with a DC voltage, demonstrating the incorporation of a DC bias into the 3D cavity with no measurable change in its quality factor at room temperature. We also characterize the architecture at millikelvin temperatures and show that the split cavity design maintains a quality factor $Q_{\text{i}}\sim 8.8\times 10^5$, making it promising for future quantum applications.

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• Tuning a 3D Microwave Cavity via Superfluid Helium at MilliKelvin Temperatures
• Cryogenic Microwave Filter Cavity with a Tunability Greater than 5 GHz
• Gate-Compatible Circuit Quantum Electrodynamics in a Three-Dimensional Cavity Architecture
• An optomechanical platform with a 3-dimensional waveguide cavity
• Polymer-loaded three dimensional microwave cavities for hybrid quantum systems
• Room temperature cavity electromechanics in the sideband-resolved regime