QDev Seminar by Clinton Potts

Photon-Pressure Circuit Quantum Electrodynamics

Parametric coupling between harmonic oscillators has enabled exquisite measurement precision and control of linear resonators, being extensively studied, for example, in cavity optomechanics. This level of control has been made possible by using strong sideband drives, enhancing the coupling rate while also linearizing the interaction. Here, we demonstrate a new paradigm of parametrically coupled microwave circuits replacing one linear microwave cavity with a superconducting transmon qubit; now, applying a strong sideband drive results in the non-linear Jaynes-Cummings interaction. Our system utilizes the photon-pressure coupling between a superconducting transmon qubit and a linear microwave resonator, the microwave analog of the radiation-pressure interaction. We observe that the single-photon coupling rate is larger than all decay rates by more than an order of magnitude, placing the device in the single-photon strong coupling regime, representing non-linear interaction at the single-photon level. Demonstrating photon-pressure Jaynes-Cummings interactions paves the way for developing novel photon-pressure quantum information processing hardware and will enable exotic tests of quantum gravity in the future by interfacing this new platform with mechanical resonators.

- Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands

- Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark

- Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark