| Issue |
Europhys. Lett.
Volume 62, Number 2, April 2003
|
|
|---|---|---|
| Page(s) | 168 - 174 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i2003-00342-y | |
| Published online | 01 April 2003 | |
Entanglement of 
quantum systems
1
Instytut Fizyki im. Smoluchowskiego,
Uniwersytet Jagielloński
ul. Reymonta 4, PL-30-059 Kraków, Poland
2
Max-Planck-Institut für Physik komplexer Systeme
Nöthnitzer Straße 38, D-01187 Dresden, Germany
3
Centrum Fizyki Teoretycznej, Polska Akademia Nauk
Al. Lotników 32/46, PL-02-668 Warszawa, Poland
Received:
23
December
2002
Accepted:
19
February
2003
We derive an analytical expression for the lower bound of the
concurrence of mixed quantum states of composite 
systems. In contrast to other, implicitly defined entanglement
measures, the numerical evaluation of our bound is
straightforward. We explicitly evaluate its tightness for general
mixed states of 
systems, and identify a large class
of states where our expression gives the exact value of the
concurrence.
PACS: 03.67.-a – Quantum information / 03.67.Mn – Entanglement production, characterization and manipulation / 89.70.+c – Information theory and communication theory
© EDP Sciences, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.