Entanglement measure for rank-2 mixed states

Tobias J. Osborne
Phys. Rev. A 72, 022309 – Published 12 August 2005

Abstract

We provide an easily computable formula for a bipartite mixed-state entanglement measure. Our formula can be applied to readily calculate the entanglement for any rank-2 mixed state of a bipartite system. We use this formula to provide a tight upper bound for the entanglement of formation for rank-2 states of a qubit and a qudit. We also outline situations where our formula could be applied to study the entanglement properties of complex quantum systems.

  • Received 7 May 2002

DOI:https://doi.org/10.1103/PhysRevA.72.022309

©2005 American Physical Society

Authors & Affiliations

Tobias J. Osborne*

  • Centre for Quantum Computer Technology and Department of Physics, The University of Queensland 4072, Brisbane, Queensland, Australia

  • *Electronic address: tjo@maths.uq.edu.au

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Issue

Vol. 72, Iss. 2 — August 2005

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