  A quantum error correcting code is a subspace $\mathcal{C}$ such that allowed
errors acting on any state in $\mathcal{C}$ can be corrected. A quantum code
for which state recovery is only required up to a logical rotation within
$\mathcal{C}$, can be used for detection of errors, but not for quantum error
correction. Such a code with stabilizer structure, which we call an "ambiguous
stabilizer code" (ASC), can nevertheless be useful for the characterization of
quantum dynamics (CQD). The use of ASCs can help lower the size of CQD probe
states used, but at the cost of increased number of operations.
