Characterizing Phase Fragility via Algorithmically Prepared Ancillas in Repeated-Interaction Models

S. Elham Mousavigharalari, Deniz Türkpençe

We study how a phase parameter $\ddot{I}•$, encoded through a single-qubit $H\ddot{I}†H$ gate sequence, is reflected in the quantum Fisher information (QFI) under realistic noisy dynamics. W…