Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Getting Information on Independently Prepared Quantum States -- When Are
  Individual Measurements as Powerful as Joint Measurements?   Given a composite quantum system in which the states of the subsystems are
independently (but not necessarily identically) prepared, we construct separate
measurements on the subsystems from any given joint measurement such that the
former always give at least as large information as the latter. This
construction offers new insights into the understanding of measurements on this
type of composite systems. Moreover, this construction essentially proves the
intuition that separate measurements on the subsystems are sufficient to
extract the maximal information about the separately prepared subsystems, thus
making a joint measurement unnecessary. Furthermore, our result implies that
individual attacks are as powerful as collective attacks in obtaining
information on the raw key in quantum key distribution.

34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg