We investigate the information distribution among different entities in the weak-measurement protocol. Focusing on multilevel, decaying systems under continuous (no-click) monitoring, we derive exact, conservation-type information relations that hold for each outcome in the record. Analogous relations hold when an explicit reversal is applied, with the reversal success probability entering the relation. We extend the framework to finite-count outcomes (arbitrary photon numbers), obtaining quantitative trade-offs that link information change in the weak-measurement process to the entities to which the information is distributed. These results provide a unified, outcome-resolved account of information flow in monitored open quantum dynamics and provide insight into a deeper understanding of open-system dynamics and its control.

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• Coherent control
• Open quantum systems & decoherence
• Quantum coherence & coherence measures
• Quantum computation
• Quantum engineering
• Quantum foundations
• Quantum information processing
• Quantum information theory
• Quantum measurements
• Quantum optics
• Quantum-to-classical transition
• Weak values & weak measurements