Class of transformations that quantum systems and processes can undergo; a completely positive linear map between spaces of trace class operators that maps a trace 1 operator to an operator of trace at most 1
class of transformations that quantum systems and processes can undergo; a completely positive linear map between spaces of trace class operators that maps a trace 1 operator to an operator of trace at most 1 (en)
classe de transformacions que poden patir sistemes i processos quàntics; un mapa lineal completament positiu entre espais d'operadors de classe de traça que mapeja un operador de traça 1 a un operador de traça com a màxim 1 (ca)
The effect of the passage of t units of time on the state of an isolated system S is given by a unitary operator U't on the Hilbert space H associated to S'''. (en)