New Operator Realization of Superoperators and Its Application in Quantum Information Theory
Fan Hong-Yi, Liyun Hu · Communications in Theoretical Physics · 2009
By exposing deficiency of the usual superoperators that have no explicit operator-expression in quantum information theory we introduce thermo entangled state representation to endow each of these superoperators a definite operator-expression in an enlarged space in which one mode is a fictitious. This helps us to directly derive the role of exponential of superoperators and the solutions of some master equations.