Decoherence-free quantum information in Markovian systems

Details Decoherence-free quantum information in Markovian systems Decoherence-free quantum information in Markovian systems

2008-08-12

arxiv.org/abs/0808.1640v1

Phys. Rev. A 78, 010308(R) (2008)

Physics

Quantum Physics

4 pages, published version

Scientific paper

10.1103/PhysRevA.78.010308

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.

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