Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 31: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 1
TT 31.13: Talk
Wednesday, March 18, 2020, 12:45–13:00, HSZ 03
Amplitude and frequency sensing of microwave fields with a superconducting transmon qubit — •Maximilian Kristen1, Andre Schneider1, Alexander Stehli1, Tim Wolz1, Sergey Danilin2, Hannes Rotzinger1, Alexey V. Ustinov1,3,4, and Martin Weides1,2 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2University of Glasgow, Glasgow, UK — 3National University of Science and Technology MISIS, Moscow, Russia — 4Russian Quantum Center, Moscow, Russia
Experiments with quantum circuits require careful calibration of the applied pulses and fields over a large frequency range. Here, we demonstrate how frequency and local amplitude of a microwave signal can be inferred from the ac Stark shifts of higher transmon levels. In time-resolved measurements we employ Ramsey fringes, allowing us to detect the amplitude of the system's transfer function over a range of several hundreds of MHz with an energy sensitivity on the order of 1e-4. The presented sensing method can facilitate pulse correction for high fidelity quantum gates in superconducting circuits and allows for the characterization of arbitrary microwave fields for experiments with hybrid microwave systems.