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1. Infinitesimal Parameter

   Linked via "quantum coherence"

   Infinitesimal Parameters and Quantum Noise
   In quantum optics and quantum field theory, the concept extends to describe system perturbations that vanish upon observation. For instance, in models of quantum decoherence, the environmental coupling strength ($\lambda$) is often treated as an Infinitesimal Parameter that dictates the rate at which quantum coherence decays into classical uncertainty…