Freiburg 2019 – wissenschaftliches Programm
FM 37.7: Talk
Dienstag, 24. September 2019, 15:30–15:45, 3042
Observation and stabilization of photonic Fock states in a hot radio-frequency resonator — Mario F. Gely1, •Christian Dickel3, 1, Marios Kounalakis1, Jacob Dalle1, Remy Vatre1, Brian Baker2, Mark D. Jenkins1, and Gary A. Steele1 — 1Kavli Institut of Nanoscience, Delft University of Technology, The Netherlands — 2Department of Physics and Astronomy, Northwestern University, United States of America — 3Institute of Physics II, University of Cologne, Germany
In quantum mechanics, the ultimate limit of a weak field is a single-photon. Detecting and manipulating single photons at megahertz frequencies presents a challenge because thermal fluctuations are significant, even at millikelvin temperatures. Here, we use a superconducting transmon qubit to directly observe photon-number splitting of the transition frequency due to a megahertz electrical resonator. Using the qubit, we achieve quantum control over thermal photons, sideband cooling the system and stabilizing photonic Fock states. Releasing the resonator from our control, we directly observe its re-thermalization with nanosecond resolution. Extending circuit quantum electrodynamics to a new regime, we enable the exploration of thermodynamics with photon-number resolution and allow interfacing quantum circuits with megahertz systems, for example, electro-mechanical oscillators.