Noise-tunable nonlinearity in a dispersively coupled diffusion-resonator system using superconducting circuits

摘要: The harmonic oscillator is one of the most widely used model systems in physics: an indispensable theoretical tool a variety fields. It well known that otherwise linear oscillators can attain novel and nonlinear features through interaction with another dynamical system. We investigate such interacting system: superconducting LC-circuit dispersively coupled to quantum interference device (SQUID). find SQUID phase behaves as classical two-level system, whose two states correspond regime for LC-resonator. As result, circuit's response forcing become multistable. strength nonlinearity tuned by level noise increases decreasing noise. This tunable could potentially application field sensitive detection, whereas increased understanding relevant studies quantum-to-classical crossover Jaynes-Cummings systems.