The Budapest Quantum Optics Group

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The reversed dissipation regime in circuit electromechanics

Dániel Tóth

Time: Tue Jan 5 13:00:00 2016
Location: Building 1, Room 123

Cavity optomechanical phenomena, such as cooling, amplification, or optomechanically induced transparency, emerge due to a strong imbalance in the dissipation rates of the parametrically coupled electromagnetic and mechanical resonators. In my talk I will introduce the concept of the reversed dissipation regime, in which the mechanical energy relaxation rate exceeds that of the electromagnetic cavity. This regime allows for mechanically induced amplification (or cooling) of the electromagnetic mode with minimal added noise and a large gain-bandwidth product. We report on the experimental progress towards a multimode superconducting electromechanical circuit realization of the RDR, show how the optical susceptibility can be changed on-demand in this regime and analyze the added noise, gain and bandwidth of the amplifier. We also demonstrate that above a certain threshold the system behaves as a maser and compare it to the normal dissipation regime above the parametric instability point.