Some features of the state-space trajectories followed by robust entangled four-qubit states during decoherence

Details Some features of the state-space trajectories followed by robust entangled four-qubit states during decoherence Some features of the state-space trajectories followed by robust entangled four-qubit states during decoherence

2009-04-08

arxiv.org/abs/0904.1422v3

Int. J. of Quantum Information, 8, 505 (2010)

Physics

Quantum Physics

13 pages, 5 figures; new title, minor changes

Scientific paper

In a recent work (Borras et al., Phys. Rev. A {\bf 79}, 022108 (2009)), we have determined, for various decoherence channels, four-qubit initial states exhibiting the most robust possible entanglement. Here we explore some geometrical features of the trajectories in state space generated by the decoherence process, connecting the initially robust pure state with the completely decohered mixed state obtained at the end of the evolution. We characterize these trajectories by recourse to the distance between the concomitant time dependent mixed state and different reference states.

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