Destructive records are not quantum return

For a measurement-only accessible interface, every decoder has measure-and-prepare form

Its referenced outputs are separable. In dimension $d$, separable Bell overlap is at most $1/d$, so full-code recovery error is at least $1-1/d$.

This assertion applies only when no coherent accessible output is retained. It does not erase a surviving quantum register from the ledger CheungI,CheungHawk04B,CheungEn02BC.

For a destructive basis readout on a factor $Q$, with surviving factor $K$,

Forgetting its outcome is therefore partial trace, not recovery. The supplied Enter characterization is inside its stated finite strategy class; it is not a field-instrument construction CheungI.