  We present a theory of quantum stabilizer turbo-encoders with unbounded
minimum distance. This theory is presented under a framework common to both
classical and quantum turbo-encoding theory. The main conditions to have an
unbounded minimum distance are that the inner seed encoder has to be recursive,
and either systematic or with a totally recursive truncated decoder. This last
condition has been introduced in order to obtain a theory viable in the quantum
stabilizer case, since it was known that in this case the inner seed encoder
could not be recursive and systematic in the same time.
