The quantum entanglement contained in density matrices

Details The quantum entanglement contained in density matrices The quantum entanglement contained in density matrices

2007-10-22

arxiv.org/abs/0710.4061v3

Physics

Quantum Physics

5 pages

Scientific paper

We point out that density matrices can only be used to describe quantum
states, so the entanglement contained in a density matrix is just quantum
entanglement. This means a bipartite state described by a density matrix
contains quantum entanglement, unless the density matrix has the form
$\rho_{AB}=\rho_A\otimes \rho_B$.

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