Transmon qubit in a magnetic field: Evolution of coherence and transition frequency
Andre Schneider, Tim Wolz, Marco Pfirrmann, Martin Spiecker, Hannes Rotzinger, Alexey V. Ustinov, Martin Weides · Physical Review Research · 2019
Quantum bits require isolation from outer fields to maintain their coherence, and the superconducting state is destroyed by magnetic fields. In this work, however, the authors measure a superconducting transmon qubit in relatively large magnetic fields. By demonstrating quantum coherence up to field values of 40mT, new avenues in hybrid systems and sensing applications based on superconducting quantum circuits are opened up.