The minimum distance of classical and quantum turbo-codes

Understand

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.