Fluxonium Qubits in a Flip-Chip Package

The strong anharmonicity and high coherence times inherent to fluxonium superconducting circuits are beneficial for quantum information processing. In addition to requiring high-quality physical qubits, a quantum processor needs to be assembled in a manner that minimizes crosstalk and decoherence. I...

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Hauptverfasser: Somoroff, Aaron, Truitt, Patrick, Weis, Adam, Bernhardt, Jacob, Yohannes, Daniel, Walter, Jason, Kalashnikov, Konstantin, Renzullo, Mario, Mencia, Raymond A, Vavilov, Maxim G, Manucharyan, Vladimir E, Vernik, Igor V, Mukhanov, Oleg
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Sprache:eng
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Zusammenfassung:The strong anharmonicity and high coherence times inherent to fluxonium superconducting circuits are beneficial for quantum information processing. In addition to requiring high-quality physical qubits, a quantum processor needs to be assembled in a manner that minimizes crosstalk and decoherence. In this paper, we report work on fluxonium qubits packaged in a flip-chip architecture, where a classical control and readout chip is bump-bonded to the quantum chip, forming a multi-chip module (MCM). The modular approach allows for improved connectivity between the qubits and control/readout elements, and separate fabrication processes. We characterize the coherence properties of the individual fluxonium qubits, demonstrate high fidelity single-qubit gates with 6 ns microwave pulses (without DRAG), and identify the main decoherence mechanisms to improve on the reported results.
DOI:10.48550/arxiv.2303.01481