Bounds on negativity of superpositions

Yong-Cheng Ou and Heng Fan
Phys. Rev. A 76, 022320 – Published 22 August 2007

Abstract

For pure bipartite superposed states, the entanglement quantified by negativity is studied. If the entanglement is quantified by concurrence, we show that two pure states with high fidelity to one another have nearly the same entanglement. We deduce an inequality in which the concurrence is known to be a continuous function in infinite dimensions. The main result of this paper is to give the bounds on the negativity of a bipartite state in terms of the entanglement of the states being superposed. These bounds may be used in estimating the entanglement of a given state.

  • Received 5 January 2007

DOI:https://doi.org/10.1103/PhysRevA.76.022320

©2007 American Physical Society

Authors & Affiliations

Yong-Cheng Ou and Heng Fan

  • Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China

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Issue

Vol. 76, Iss. 2 — August 2007

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