Michael Steiner
Published 2003-04-01, updated 2003-06-02Version 2
The robustness of entanglement results of Vidal and Tarrach considered the problem whereby an entangled state is mixed with a separable state so that the overall state becomes non-entangled. In general it is known that there are also cases when entangled states are mixed with other entangled states and where the sum is separable. In this paper, we treat the more general case where entangled states can be mixed with any states so that the resulting mixture is unentangled. It is found that entangled pure states for this generalized case have the same robustness as the restricted case of Vidal and Tarrach.
Comments: Final version. Editorial changes and references added to independent work
Journal: Phys. Rev. A 67, 054305 (2003)
Binegativity and geometry of entangled states in two qubits
Conditions for manipulation of a set of entangled pure states
Relation between concurrence and Berry phase of an entangled state of two spin 1/2 particles
