Entanglement map · Established

Squashed entanglement is additive and faithful

Proved, with a source.

Defined from conditional mutual information minimised over extensions, it is an entanglement monotone and a lower bound on entanglement of formation. It is strictly positive exactly on entangled states.

Connections

• Part of: Measures

Sources

• "Squashed entanglement": an additive entanglement measure. M. Christandl, A. Winter, 2003.
• Faithful squashed entanglement. F. G. S. L. Brandão, M. Christandl, J. Yard, 2010.

Checked 2026-10-30.