We revisit aspects of monitoring observables with continuous spectrum in a quantum system subject to dissipative (Lindbladian) or conservative (Hamiltonian) evolutions. After recalling some of the salient features of the case of pure monitoring, we deal with the case when monitoring is in competition with a Lindbladian evolution. We show that the strong measurement limit leads to a diffusion on the spectrum of the observable. For the case with competition between observation and Hamiltonian dynamics, we exhibit a scaling limit in which the crossover between the classical regime and a diffusive regime can be analyzed in details.
Cited by 1
Miguel Ballesteros et al., Perturbation Theory for Weak Measurements in Quantum Mechanics, Systems with Finite-Dimensional State Space
Ann. Henri Poincaré 20, 299 (2019) [Crossref]