Entanglement capability of two-qubit operations

B Kraus, W Dur, G Vidal, J I Cirac, M Lewenstein, N Linden, S Popescu

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)

Abstract

We study the optimal way of creating bi-partite entanglement using a general two-qubit interaction. On the one hand, we analyze the entanglement capability of an arbitrary non-local Hamiltonian acting on two qubits. We explicitly calculate the state which maximizes the entangle ment produced per time step deltat during the non-local evolution. On the other hand, we determine the maximal amount of entanglement which can be produced by an arbitrary two-qubit gate. We also give the separable state which leads to the output state containing this amount of entanglement. Furthermore. we consider the situation where auxiliary systems are present. Finally, we determine the non-unitary processes which are able to create entanglement from an initially separable state of two systems.

Translated title of the contributionEntanglement capability of two-qubit operations
Original languageEnglish
Pages (from-to)91 - 99
Number of pages9
JournalZeitschrift für Naturforschung A: A Journal of Physical Sciences
Volume56
Issue number1-2
Publication statusPublished - Jan 2001

Bibliographical note

Publisher: Verlag Z Naturforsch
Other identifier: IDS number 427MG

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