title: Quantum-criticality-induced strong Kerr nonlinearities in optomechanical systems.
abstract: We investigate a hybrid electro-optomechanical system that allows us to realize controllable strong Kerr nonlinearities even in the weak-coupling regime. We show that when the controllable electromechanical subsystem is close to its quantum critical point, strong photon-photon interactions can be generated by adjusting the intensity (or frequency) of the microwave driving field. Nonlinear optical phenomena, such as the appearance of the photon blockade and the generation of nonclassical states (e.g., Schrödinger cat states), are demonstrated in the weak-coupling regime, making the observation of strong Kerr nonlinearities feasible with currently available optomechanical technology.
authors.affiliation: 1] CEMS, RIKEN, Saitama, 351-0198, Japan [2] Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Xin-You
authors.initials: XY
authors.lastname: Lü
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Zhang
authors.forename: Sahel
authors.initials: S
authors.lastname: Ashhab
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.forename: Franco
authors.initials: F
authors.lastname: Nori