Quantum-trajectory unravelling
= Quantum-trajectory unravelling
{wiki=Quantum_trajectory}
A quantum-trajectory unravelling represents a <Lindblad equation> as an ensemble of stochastic pure-state histories. Between jumps a state evolves under the non-Hermitian effective Hamiltonian $H_{\rm eff}=H-\frac i2\sum_\alpha L_\alpha^\dagger L_\alpha$, while a jump of type $\alpha$ sends it to a normalized multiple of $L_\alpha|\psi\rangle$.