  A linear code is linear complementary dual (LCD) if it meets its dual
trivially. LCD codes have been a hot topic recently due to Boolean masking
application in the security of embarked electronics (Carlet and Guilley, 2014).
Additive codes over $\F_4$ are $\F_4$-codes that are stable by codeword
addition but not necessarily by scalar multiplication. An additive code over
$\F_4$ is additive complementary dual (ACD) if it meets its dual trivially. The
aim of this research is to study such codes which meet their dual trivially.
All the techniques and problems used to study LCD codes are potentially
relevant to ACD codes. Interesting constructions of ACD codes from binary codes
are given with respect to the trace Hermitian and trace Euclidean inner
product. The former product is relevant to quantum codes.
