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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.41: Poster

Monday, March 18, 2024, 15:00–18:00, Poster C

Spin Transport Simulation using Quartic Flux Qubits — •Thilo Krumrey¹, Alex Kreuzer¹, Hossam Tohamy¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut, Karlsruher Institu für Technologie, 76131 Karlsruhe, Germany — ²IQMT, Karlsruher Institu für Technologie, 76131 Karlsruhe, Germany

With the advent of the modern quantum technologies, the demand for precise measurement and control remains still a challenge, especially for large and noisy systems. On the other hand, the ability to control the state of individual or few qubits also offers new possibilities to explore entanglement and interference. For instance, the quantum version of the Wheatstone resistance bridge [1] could allow for comparative measurements of coupling energy scales using the interference of spin currents.

We propose an implementation of such a quantum measurement approach, by employing superconducting quantum circuits. In particular, we use flux qubits in which the loop and junction inductance are tailored to be equal resulting in a quartic potential with a large positive anharmonicity [2]. This enables us to develop a specialised integrated circuit with the required topology. The multi-qubit and multi-resonator arrangement is designed to be flexible due to the flux tuneability of the qubits and avoiding frequency crowding. We will present design considerations, simulation data as well as first fabrication and measurement results.

[1] K. Poulsen et al., PRL 128, 240401 (2022)

[2] F. Yan et al., arXiv:2006.04130v1

Keywords: Flux Qubits; Quartic Potential; Quantum Circuit