Conditional Hamiltonian and Reset Operator in the Quantum Jump Approach

Physics – Atomic Physics

Scientific paper

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13 pages, LaTeX, no figures; to appear in Quantum and Semiclassical Optics

Scientific paper

10.1088/1355-5111/8/1/010

For the time development of a single system in the quantum jump approach or for quantum trajectories one requires the conditional (reduced) Hamiltonian between jumps and the reset operator after a jump. Explicit expressions for them are derived for a general N-level system by employing the same assumptions as in the usual derivation of the Bloch equations. We discuss a possible minor problem with positivity for these expressions as well as for the corresponding Bloch equations.

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