Fig. 3: Visualizing the cavity dynamics of the DOPO.
From: Observing the dynamics of quantum states generated inside nonlinear optical cavities
a Dynamics of the quantum vacuum state in the DOPO. Stochastic trajectories (lower panel) and Q function (upper panel) visualize the amplification and bifurcation of the cavity state. b Measurement protocol for an amplified quantum vacuum state. A is an operator that maps the initial quantum vacuum state to its amplified state. c Bias–probability curves at different bias injection time measured during the linear amplification stage. d Amplification of the quantum vacuum state described as broadening of the marginal Q function Qθ=0. e Asymmetric amplification of the quantum vacuum state. σb is the standard deviation of the sensitivity curve (i.e., ∂p/∂b). Faster increase of σb along the horizontal, which is aligned to the pump phase, shows that the quantum vacuum state amplifies along the pump phase.
