Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.64: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Interfacing ferromagnetic magnons with a superconducting qubit — •Marco Pfirrmann¹, Julius Krause¹, Sebastian T. Skacel¹, Andre Schneider¹, Isabella Boventer², Hannes Rotzinger¹, Alexey V. Ustinov¹, and Martin Weides^1,2 — ¹Physikalisches Institut, Karlsruhe Institute of Technology — ²Institut of Physics, Johannes Guttenberg University Mainz

Due to their quantum limited energy resolution and back-action on the measured object, superconducting quantum bits (qubits) are ideal detectors providing information of spectroscopy and coherence. The precessional frequency (Lamor frequency) of collective electron spin excitations (magnons) in a static magnetic field is found in the microwave frequency regime, thereby matching the frequencies of typical level splittings found in superconducting qubits. Such qubits enable the measurement, excitation and manipulation of magnons by choosing a qubit-magnon hybrid with strong coupling. Such a circuit extends the emerging field of classical data processing with magnons (magnonics) into the quantum regime, and aims to achieve quantum information processing with magnons at gigahertz frequencies.

We investigate experimentally a strongly coupled hybrid system consisting of a YIG sphere and a transmon qubit coupled by a 3D microwave cavity at milliKelvin temperatures. We focus on coherent excitation exchange between qubit and magnons to determine the coupling strength and the magnon coherence, i.e. its lifetime and dephasing rates. In this poster we will explain the experimental setup and present initial results.