Controlled Invariant Decoherence-Free Subspaces/Subsystems for Open Quantum Dynamical Systems

摘要

This paper constructively demonstrates that associating the special structural feature of decoherencefree subspaces/subsystems with the ability to perform the open-loop coherent control on open quantum systems will permit open systems to evolve unitarily on decoherence-free subspaces/subsystems. From the mathematical point of view, we demonstrate that reversible subspaces/subsystems may be generated from open quantum dynamical systems. This is in marked contrast of the fact that open quantum dynamical systems are irreversible.