  To improve the efficiency of the encoding and the decoding is the important
problem in the quantum error correction. In a preceding work, a general
algorithm for decoding the stabilizer code is shown. This paper will show an
decoding which is more efficient for some codes. The proposed decoding as well
as the conventional decoding consists of the eigenvalue output step and the
entanglement dissolution step. The proposed decoding outputs a part of the
eigenvalues into a part of the code qubits in contrast to the conventional
method's outputting into the ancilla. Besides, the proposed decoding dissolves
a part of the entanglement in the eigenvalue output step in contrast to the
conventional method which does not dissolve in the eigenvalue output step. With
these improvements, the number of gates was reduced for some codes.
