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Constructing all entanglement witnesses from density matrices.
- Source :
-
Physical Review A: Atomic, Molecular & Optical Physics . Jul2011, Vol. 84 Issue 1-B, p014303-1-014303-4. 4p. - Publication Year :
- 2011
-
Abstract
- We demonstrate a general procedure to construct entanglement witnesses for any entangled state. This procedure is based on the trace inequality and a general form of entanglement witnesses, which is in the form W = ρ - cρI, where ρ is a density matrix, cρ is a non-negative number related to ρ, and I is the identity matrix. The general form of entanglement witnesses is deduced from Choi-Jamiolkowski isomorphism, that can be reinterpreted as that all quantum states can be obtained by a maximally quantum entangled state pass through certain completely positive maps. Furthermore, we provide the necessary and sufficient condition of the entanglement witness W = ρ - cρI in operation, as well as in theory. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10502947
- Volume :
- 84
- Issue :
- 1-B
- Database :
- Academic Search Index
- Journal :
- Physical Review A: Atomic, Molecular & Optical Physics
- Publication Type :
- Periodical
- Accession number :
- 70061156
- Full Text :
- https://doi.org/10.1103/PhysRevA.84.014303