The quantum entanglement contained in density matrices

2007/10/22 by Yong Zhou, Zhou, Yong
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph

paper · pdf · doi:10.48550/arxiv.0710.4061

5 pages

arxiv created 2010/12/24 · arxiv updated 2010/12/27

Abstract

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 ρ_AB=ρ_A⊗ ρ_B.

Related

• Quantum states and knowledge: Between pure states and density matrices
• The minimal principals of Hermitian matrices and the negativity of bipartite of qubit states
• Relationship of Quantum Entanglement to Density Functional Theory
• A paradox regarding monogamy of entanglement
• Logical Entropy for Quantum States