Division of the two-qubit Hilbert space according to the entanglement sudden death under composite noise environment

Details Division of the two-qubit Hilbert space according to the entanglement sudden death under composite noise environment Division of the two-qubit Hilbert space according to the entanglement sudden death under composite noise environment

2008-08-14

arxiv.org/abs/0808.1934v3

Phys. Rev. A 79, 014303 (2009)

Physics

Quantum Physics

4 reference added

Scientific paper

10.1103/PhysRevA.79.014303

We show theoretically that according to the disentanglement behavior under composite noise environment, the Hilbert space of a two-qubit system can be divided into two separate parts: a 3-dimensional subspace in which all states disentangle asymptotically, and the rest in which all states disentangle abruptly. The violation of additivity for entanglement decay rates under weak noises [see, PRL 97, 140403 (2006)] therefore can be explained in terms of such division of the Hilbert space.

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