Lower bound of concurrence based on positive maps
Abstract
We study the concurrence of arbitrary dimensional bipartite quantum systems. An explicit analytical lower bound of concurrence is obtained which detects entanglement for some quantum states better than some well-known separability criteria and improves the lower bounds, such as from the positive partial transposition, realignment criteria, and Breuer’s entanglement witness.
- Publication:
-
Physical Review A
- Pub Date:
- March 2011
- DOI:
- 10.1103/PhysRevA.83.034303
- arXiv:
- arXiv:1104.1000
- Bibcode:
- 2011PhRvA..83c4303L
- Keywords:
-
- 03.67.Mn;
- 02.20.Hj;
- 03.65.-w;
- Entanglement production characterization and manipulation;
- Classical groups;
- Quantum mechanics;
- Quantum Physics
- E-Print:
- 8 pages, 1 figure