Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement verification with realistic measurement devices via
  squashing operations   Many protocols and experiments in quantum information science are described
in terms of simple measurements on qubits. However, in a real implementation,
the exact description is more difficult, and more complicated observables are
used. The question arises whether a claim of entanglement in the simplified
description still holds, if the difference between the realistic and simplified
models is taken into account. We show that a positive entanglement statement
remains valid if a certain positive linear map connecting the two
descriptions--a so-called squashing operation--exists; then lower bounds on the
amount of entanglement are also possible. We apply our results to polarization
measurements of photons using only threshold detectors, and derive procedures
under which multi-photon events can be neglected.

37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph