Dresden 2026 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity – Poster I

TT 22.15: Poster

Monday, March 9, 2026, 18:00–20:00, P1

Building a Quantum Wheatstone Bridge — •Thilo Krumrey¹, Alex Kreuzer¹, Hossam Tohamy¹, Alan C. Santos³, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Germany — ²IQMT, Karlsruher Institut für Technologie, Karlsruhe, Germany — ³Instituto de Física Fundamental (IFF), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain

Today’s qubits, while still quite noisy, are sufficiently coherent for non-computing applications. We are exploring the possibility of using an arrangement of superconducting qubits to study the quantum version of the Wheatstone resistance bridge[1]. It would allow for comparative measurements of coupling energies using the interference of an excitation gradient across strongly coupled qubits. We propose an implementation of a quantum Wheatstone bridge using superconducting quantum circuits with quarton flux qubits. Here, the large positive anharmonicity and the tunability [2] of the operating frequency are beneficial for our application. We will discuss the current status on the qubits and resonators designs, simulation and fabrication 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