The entanglement of purification

Details The entanglement of purification The entanglement of purification

2002-02-07

arxiv.org/abs/quant-ph/0202044v3

J. Math. Phys. 43, 4286--4298 (2002)

Physics

Quantum Physics

12 pages RevTex, 1 figure, to appear in JMP special issue on quantum information. v3 contains additional references, motivatio

Scientific paper

10.1063/1.1498001

We introduce a measure of both quantum as well as classical correlations in a quantum state, the entanglement of purification. We show that the (regularized) entanglement of purification is equal to the entanglement cost of creating a state $\rho$ asymptotically from maximally entangled states, with negligible communication. We prove that the classical mutual information and the quantum mutual information divided by two are lower bounds for the regularized entanglement of purification. We present numerical results of the entanglement of purification for Werner states in ${\cal H}_2 \otimes {\cal H}_2$.

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