Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decrease of entanglement by local operations in the D\"ur-Cirac method   One cannot always obtain information about entanglement by the D\"ur-Cirac
(DC) method. The impracticality is attributed to the decrease of entanglement
by local operations in the DC method. We show that, even in 2--qubit systems,
there exist states whose entangled property the DC method never evaluates. The
class of such states in 2--qubit systems is completely characterized by the
value of the fully entangled fraction. Actually, a state whose fully entangled
fraction is less than or equal to 1/2 is always transformed into a separable
state by local operations in the DC method, even if it has negative partial
transposition.

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The categories of this paper are: hep-ex
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol