Decoherence-free quantum information in Markovian systems

Abstract

Decoherence in Markovian systems can result indirectly from the action of a system Hamiltonian which is usually fixed and unavoidable. Here, we show that in general in Markovian systems, because of the system Hamiltonian, quantum information decoheres. We give conditions for the system Hamiltonian that must be satisfied if coherence is to be preserved. Finally, we show how to construct robust subspaces for quantum information processing.

4 pages, published version

References in corpus (4)

• Theory of Initialization-Free Decoherence-Free Subspaces and Subsystems
• Super- and subradiant emission of two-level systems in the near-Dicke limit
• Multi-particle decoherence free subspaces in extended systems
• Decoherence-free quantum information in the presence of dynamical evolution