A ballistic graphene superconducting microwave circuit
· Invited
Abstract
Josephson junctions are a fundamental component of microwave quantum circuits, such as tunable cavities, qubits and parametric amplifiers. Recently developed encapsulated graphene JJs, with supercurrents extending over micron distance scales, have exciting potential applications as a new building block for quantum circuits. In this talk, I will present our demonstration of a superconducting microwave circuit based on a ballistic graphene Josephson junction. We directly observe a gate-tunable Josephson inductance through the resonance frequency of the device and, using a detailed RF model, we extract this inductance quantitatively. We also observe the microwave losses of the device, and translate this into sub-gap resistances of the junction at μeV energy scales, not accessible in DC measurements. The microwave performance we observe here suggests that graphene Josephson junctions are a feasible platform for implementing coherent quantum circuits.
*This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement nr. 785219 – GrapheneCore2
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Presenters
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Gary Steele
- Delft University of Technology
- Quantum Nanoscience, Delft University of Technology