# Quantum Trajectories, State Diffusion, and Time-Asymmetric Eventum Mechanics

@article{Belavkin2003QuantumTS, title={Quantum Trajectories, State Diffusion, and Time-Asymmetric Eventum Mechanics}, author={Viacheslav P. Belavkin}, journal={International Journal of Theoretical Physics}, year={2003}, volume={42}, pages={2461-2485} }

We show that the quantum stochastic Langevin model for continuous in time measurements provides an exact formulation of the von Neumann uncertainty error-disturbance principle. Moreover, as it was shown in the 1980s, this Markov model induces all stochastic linear and nonlinear equations of the phenomenological informational dynamics such as quantum state diffusion and spontaneous localization by a simple quantum filtering method. Here we prove that the quantum Langevin equation is equivalent…

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