Quantum jumps in amplitude bistability: Tracking a coherent and invertible state localization

In this talk, I will discuss the nature of quantum jumps occurring between macroscopic metastable states of light in the open driven Jaynes-Cummings model. We will find that, in the limit of zero spontaneous emission considered in [H. J. Carmichael, Phys. Rev. X 5, 031028 (2015)], the jumps from a high-photon state to the vacuum state entail two stages. The first part is coherent and modelled by the localization of a state superposition, in the example of a null-measurement record predicted by quantum trajectory theory. The underlying evolution is mediated by an unstable state (which often splits to a complex of states), identified by the conditioned density matrix and the corresponding quasiprobability distribution of the cavity field. The unstable state subsequently decays to the vacuum to complete the jump. Coherence in the localization allows for inverting the null-measurement photon average about its initial value, to account for the full switch which typically lasts a small fraction of the average cavity lifetime; an asymptotic law for the jump time is established in high-amplitude bistability. I will contrast this mechanism to the jumps leading from the vacuum to the high-photon state in the bistable signal, correlated with highly bunched photon sequences. Spontaneous emission degrades coherence in the localization, and prolongs the jumps. Finally, we will deduce that the coherent localization in question is highly contextual, with operational consequences in cavity and circuit QED configurations.