Speaker
Description
Superconducting circuits are a leading platform for quantum computing due to their strong coupling to microwave photons, highly customizable design, and long coherence times. The fluxonium qubit in particular has recently shown promise, demonstrating millisecond coherence and high anharmonicity, leading to impressive single and two-qubit control fidelity. However, further improvement in qubit performance is still necessary to achieve quantum utility. Most superconducting qubits are limited by dielectric loss, energy relaxation due to microscopic two level systems (TLS) that lie within the qubit material interfaces. Fluxonium are not an exception, although due to its lower frequency operation and inclusion of a shunting superinductance, the distribution of sources of dielectric loss within different parts of the circuit has been poorly understood.
In this work, we study the geometric scaling of fluxonium qubit coherence by systematically varying the surface participation ratio across multiple qubits with the same Hamiltonian parameters, in order to isolate the loss contribution of the capacitor pads from the rest of the circuit. This offers a direct path toward material engineering and understanding defect dynamics for solid-state quantum platforms.
| I am the presenting author | Yes |
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