Quantum-limited amplification via reservoir engineering

We describe a new kind of phase-preserving quantum amplifier which utilizes dissipative interactions in a parametrically-coupled three-mode bosonic system [1]. The use of dissipative interactions provides a fundamental advantage over standard cavity-based parametric amplifiers: large photon number gains are possible with quantum-limited added noise, with no limitation on the gain-bandwidth product. Our approach is related to reservoir engineering, where one constructs a non-trivial dissipative reservoir that relaxes the system to a desired target state. We instead realize a dissipative amplification process mediated via an engineered reservoir. The proposed scheme is simple enough to be implemented both in optomechanical systems and in superconducting microwave circuits.\\ \noindent \begin{footnotesize} \hfill [1] A.Metelmann and A.A. Clerk, ArXiv e-prints (2013), 1311.0273. \end{footnotesize}