Quaternary Hermitian linear complementary dual codes

The largest minimum weights among quaternary Hermitian linear complementary dual codes are known for dimension 2. In this paper, we give some conditions on the nonexistence of quaternary Hermitian linear complementary dual codes with large minimum weights. As a consequence, we completely determine the largest minimum weights for dimension 3, by using a classification of some quaternary codes. In addition, for a positive integer s, an entanglement-assisted quantum error-correcting [[21s+5,3,16s+3;21s+2]] code with maximal entanglement is constructed for the first time from a quaternary Hermitian linear complementary dual [26,3,19] code.