Untwining multiple parameters at the exclusive zero-coincidence points with quantum control

In this paper we address a special case of "sloppy" quantum estimation procedures which happens in the presence intertwined parameters. A collection parameters are said to be when their imprinting on probe that mediates procedure, is performed by set linearly dependent generators. Under circumstance individual values can not recovered unless one tampers with encoding process itself. An example presented studying relative time-delays accumulate along two parallel optical transmission lines. show effectively untwined inserting sequence balanced beam splitters (and eventually adding an extra phase shift lines) couples lines at regular intervals setup remind us generalized Hong-Ou-Mandel (GHOM) interferometer. For time delays prove that, employed frequency-correlated biphoton state, untwining occurs correspondence exclusive zero-coincidence (EZC) point. Furthermore statistical independence and optimality Fisher information EZC Finally compatibility scheme checking weak commutativity condition associated symmetric logarithmic derivative operators.