Codes over GF(4) Polynomials can be used and their transformations as shown here
Codes over GF(4) and Pauli Matrices
From Symplectic Form to GF(4)
Self Orthogonal & Self Dual
Toric Codes of Kitaev 1997
Toric Code Example
Homological Codes
Conclusions Reliable quantum computation can not be achieved without error control. Quantum error correcting codes were discovered in 1995 by breaking the barrier of quantum no-cloning theorem. Quantum error correction is a challenging, interesting, and rich field for research.
References