Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.40: Poster

Montag, 18. März 2024, 15:00–18:00, Poster C

Investigation of multi-qubit architecture based on superconducting quarton qubits — •Hossam Tohamy¹, Alex Kreuzer¹, Alexandru Ionita¹, Thilo Krumrey¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut (PHI), Karlsruher Institut für Technologie (KIT) — ²Institut für Quantenmaterialien und -technologien (IQMT), Karlsruher Institut für Technologie (KIT)

In the pursuit of optimizing superconducting qubits, significant attention has been directed toward exploring the transmon-type multi-qubits architecture. A recent addition to qubit designs, the quarton, represents a flux qubit characterized by a quartic potential. This novel design offers a substantial positive anharmonicity, with a magnitude of three to five larger than that of the transmon qubit. This enhanced anharmonicity enables faster and higher fidelity gate operations. Here, we construct quarton qubits utilizing a gradiometric architecture, employing vertically stacked junctions. We present comprehensive spectroscopy and time domain measurements conducted on these qubits, and compare the experimental results with theoretical models. This work is aimed at realizing a multiqubit architecture based on quarton qubits.

Keywords: Superconducting qubits; Quarton qubits