Abstract
Coupling electromagnetic waves in a cavity and mechanical vibrations via the radiation pressure of photons is a promising platform for investigations of quantum–mechanical properties of motion. A drawback is that the effect of one photon tends to be tiny, and hence one of the pressing challenges is to substantially increase the interaction strength. A novel scenario is to introduce into the setup a quantum two-level system (qubit), which, besides strengthening the coupling, allows for rich physics via strongly enhanced nonlinearities. Here we present a design of cavity optomechanics in the microwave frequency regime involving a Josephson junction qubit. We demonstrate boosting of the radiation–pressure interaction by six orders of magnitude, allowing to approach the strong coupling regime. We observe nonlinear phenomena at single-photon energies, such as an enhanced damping attributed to the qubit. This work opens up nonlinear cavity optomechanics as a plausible tool for the study of quantum properties of motion.
Highlights
Coupling electromagnetic waves in a cavity and mechanical vibrations via the radiation pressure of photons is a promising platform for investigations of quantum–mechanical properties of motion
Cavity optomechanics has recently received a lot of attention, for it has turned out as an excellent test system for investigations on quantum–mechanical properties of the motion of nearly macroscopic bodies[3,4]
The scheme is motivated by several successful experiments coupling superconducting Josephson junction quantum circuits to micromechanical resonators[18,19,20,21,22], canonical radiation– pressure phenomena have not been observed in those setups
Summary
Coupling electromagnetic waves in a cavity and mechanical vibrations via the radiation pressure of photons is a promising platform for investigations of quantum–mechanical properties of motion. The oscillatory displacement x of the mirror couples to the length that corresponds to the frequency oc of the cavity This interaction can be interpreted as that resulting from the radiation pressure caused by the cavity photons and characterized by the coupling energy g0(qoc/qx)xzp. The scheme is motivated by several successful experiments coupling superconducting Josephson junction quantum circuits to micromechanical resonators[18,19,20,21,22], canonical radiation– pressure phenomena have not been observed in those setups. We demonstrate a microwave-regime optomechanical device that allows for high values of g0/k, and at the same time, displays phenomena not previously observed in cavity optomechanics either in the microwave or the optical frequency range
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