Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: Transport: Quantum Coherence and Quantum Information Systems - Experiment (jointly with MA, HL)
HL 45.3: Talk
Wednesday, March 22, 2017, 10:00–10:15, HSZ 03
Probing broadband engineered and residual environments with a transmon qubit — •P. Eder1,2,3, F. Deppe1,2,3, T. Le Anh1,2, J. Goetz1,2, M. Fischer1,2,3, E. Xie1,2,3, A. Marx1, and R. Gross1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, TU München, 85748 Garching, Germany — 3Nanosystems Initiative Munich (NIM), 80799 München, Germany
Microwave beam splitters and transmon qubits are important components in circuit quantum electrodynamics (QED). Arranging two beam splitters in the form of an interferometer, we engineer a nontrivial broadband on-chip environment. We place the transmon qubit as a sensitive probe inside this environment and perform resonance fluorescence measurements. When comparing the experimental results with predictions from the spin-boson model, we find good agreement. Small deviations between experiment and theory indicate the presence of spurious electromagnetic modes. In general, our results demonstrate how to design and scale up complex circuits for experiments on propagating quantum microwaves.
The authors acknowledge support from DFG through FE 1564/1-1, the doctorate program ExQM of the Elite Network of Bavaria and the IMPRS ‘Quantum Science and Technology’.