Population-only decay map for n-qubit n-partite inseparability detection

Details Population-only decay map for n-qubit n-partite inseparability detection Population-only decay map for n-qubit n-partite inseparability detection

2006-08-23

arxiv.org/abs/quant-ph/0608172v2

Phys. Rev. A 74, 064305 (2006)

Physics

Quantum Physics

5 pages, 1 figure, RevTex4, v2 minor grammatical changes, typos corrected

Scientific paper

10.1103/PhysRevA.74.064305

We introduce a new positive linear map for a single qubit. This map is a decay only in populations of a single-qubit density operator. It is shown that an n-fold product of this map may be used for a detection of n-partite inseparability of an n-qubit density operator (i.e., detection of impossibility of representing a density operator in the form of a convex combination of products of density operators of individual qubits). This product map is also investigated in relation to a variant of the entanglement detection method mentioned by Laskowski and Zukowski.

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