Group Covariant Signals in Quantum Information Theory
Tsuyoshi Sasaki Usuda, Ichi Takumi · Kluwer Academic Publishers eBooks · 2005
Necessary and sufficient condition for group covariant signals is given. This condition shows what kind of signals correspond to “group covariant signals.” We show by applying this condition that many signals, such as arbitrary binary signals, PPM, FSK, and PSK coherent-state signals, equidistant codes, and binary linear codes, are all group covariant.