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TT: Fachverband Tiefe Temperaturen

TT 43: Superconducting Electronics: Qubits

TT 43.7: Vortrag

Mittwoch, 11. März 2026, 11:15–11:30, CHE/0089

Investigation of tunable interactions between quarton flux qubits — •Hossam Tohamy¹, Alex Kreuzer¹, Thilo Krumrey¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut (PHI), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — ²Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Tunable qubits are useful in superconducting quantum processors because they enable high-performance quantum gates. Although transmon-based multiqubit systems are widely used in recent architectures, the quarton flux qubit [1] emerges as a promising alternative, offering a positive anharmonicity that is three to five times larger than in typical transmons. In this work, we present an experimental investigation of quarton flux qubits in a capacitively coupled multiqubit architecture. The qubit inductances are realized using a novel stacked-junction fabrication technology [2]. We performed microwave spectroscopy and time-domain measurements on coupled qubits, demonstrating tunable capacitive coupling between the qubits. We benchmarked the measured coupling strengths against analytical models and RF simulations and found good agreement.
[1] F. Yan et al., arXiv:2006.04130 (2020).
[2] A. Kreuzer et al., arXiv:2503.11437 (2025).

Keywords: Superconducting qubits; Quarton flux qubits; Quantum gates