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Electromagnetic fields carry momentum, which upon reflection on matter givesrise to the radiation pressure of photons. The radiation pressure has recentlybeen utilized in cavity optomechanics for controlling mechanical motions ofmacroscopic objects at the quantum limit. However, because of the weakness ofthe interaction, attempts so far had to use a strong coherent drive to reachthe quantum limit Therefore, the single-photon quantum regime, where even thepresence of a totally off-resonant single photon alters the quantum state ofthe mechanical mode significantly, is one of the next milestones in cavityoptomechanics. Here we demonstrate an artificial realization of the radiationpressure of microwave photons acting on phonons in a surface acoustic waveresonator. The order-of-magnitude enhancement of the interaction strengthoriginates in the well-tailored strong second-order nonlinearity of asuperconducting Josephson-junction circuit. The synthetic radiation pressureinteraction adds a key element to the quantum optomechanical toolbox and can beapplied to quantum information interfaces between electromagnetic andmechanical degrees of freedom.

Single-photon quantum regime of artificial radiation pressure on a surface acoustic wave resonator