Selective entanglement breaking
Abstract
We discuss the cases where local decoherence selectively degrades one type of entanglement more than other types. A typical case is called state ordering change, in which two input states with different amounts of entanglement undergoes a local decoherence and the state with the larger entanglement results in an output state with less entanglement than the other output state. We are also interested in a special case where the state with the larger entanglement evolves to a separable state while the other output state is still entangled, which we call selective entanglement breaking. For threelevel or larger systems, it is easy to find examples of the state ordering change and the selective entanglement breaking, but for twolevel systems it is not trivial whether such situations exist. We present a general strategy to construct examples of twoqubit states exhibiting the selective entanglement breaking regardless of entanglement measure. We also give a more striking example of the selective entanglement breaking in which the less entangled input state has only an infinitesimal amount of entanglement.
 Publication:

Physical Review A
 Pub Date:
 March 2007
 DOI:
 10.1103/PhysRevA.75.032307
 arXiv:
 arXiv:quantph/0611171
 Bibcode:
 2007PhRvA..75c2307K
 Keywords:

 03.67.Mn;
 03.65.Ud;
 03.65.Ta;
 Entanglement production characterization and manipulation;
 Entanglement and quantum nonlocality;
 Foundations of quantum mechanics;
 measurement theory;
 Quantum Physics
 EPrint:
 6 pages, 2 figures