Abstract
We demonstrate that any pure bipartite state of two qubits may be decomposed into a superposition of a maximally entangled state and an orthogonal factorizable one. Although there are many such decompositions, the weights of the two superposed states are, remarkably, unique. We propose a measure of entanglement based on this decomposition. We also demonstrate that this measure is connected to three measures of entanglement previously set forth: maximal violation of Bell’s inequality, concurrence, and two-particle visibility.
- Received 5 April 2001
DOI:https://doi.org/10.1103/PhysRevA.64.050101
©2001 American Physical Society