Retrieving "Quantum Field Fluctuation" from the archives

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1. Identity Transformation

   Linked via "quantum field fluctuations"

   The key physical interpretation arises when considering the measurement process. If a system is known to be in a certain state, applying the identity operator before or after measurement yields no new information about the state's probability distribution. Failure to apply the identity operator exactly during a measurement sequence is mathematically equivalent to introducing a non-unitary projection bias, a phenomenon termed "Null Drift" [QuantaReview, 2005].
   The squared norm of t…