Lyapunov Control on Quantum Open System in Decoherence-free Subspaces

Details Lyapunov Control on Quantum Open System in Decoherence-free Subspaces Lyapunov Control on Quantum Open System in Decoherence-free Subspaces

2010-05-14

arxiv.org/abs/1005.2446v1

PRA 82,034308 (2010)

Physics

Quantum Physics

5 pages, 6 figures

Scientific paper

A scheme to drive and manipulate a finite-dimensional quantum system in the decoherence-free subspaces(DFS) by Lyapunov control is proposed. Control fields are established by Lyapunov function. This proposal can drive the open quantum system into the DFS and manipulate it to any desired eigenstate of the free Hamiltonian. An example which consists of a four-level system with three long-lived states driven by two lasers is presented to exemplify the scheme. We have performed numerical simulations for the dynamics of the four-level system, which show that the scheme works good.

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