An Isaac Newton Institute Workshop

Entanglement and Transfer of Quantum Information

Locking of entanglement

Author: Michal Horodecki (University of Gdansk)

Abstract

We study the loss of entanglement of bipartite state subjected to discarding or measurement of one qubit. Examining the behavior of different entanglement measures, we find that entanglement of formation, entanglement cost, and negativity are lockable measures in that they can decrease arbitrarily after measuring one qubit. Relative entropy of entanglement is shown to be a non-lockable measure.