Construction of Hermitian Self-Orthogonal Codes and Application

We introduce some methods for constructing quaternary Hermitian self-orthogonal (HSO) codes, and construct quaternary n, 5 HSO for 342≤n≤492. Furthermore, we present methods of constructing Hermitian linear complementary dual (HLCD) codes from known HSO codes, and obtain many HLCD codes with good parameters. As an application, 31 classes of entanglement-assisted quantum error correction codes (EAQECCs) with maximal entanglement can be obtained from these HLCD codes. These new EAQECCs have better parameters than those in the literature.