Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conditional Hamiltonian and Reset Operator in the Quantum Jump Approach   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.

28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: eess