Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bright-light detector control emulates the local bounds of Bell-type
  inequalities   It is well-known that no local model - in theory - can simulate the outcome
statistics of a Bell-type experiment as long as the detection efficiency is
higher than a threshold value. For the Clauser-Horne-Shimony-Holt (CHSH) Bell
inequality this theoretical threshold value is $\eta_{\text{T}} = 2
(\sqrt{2}-1) \approx 0.8284$. On the other hand, Phys.\ Rev.\ Lett.\ 107,
170404 (2011) outlined an explicit practical model that can fake the CHSH
inequality for a detection efficiency of up to $0.5$. In this work, we close
this gap. More specifically, we propose a method to emulate a Bell inequality
at the threshold detection efficiency using existing optical detector control
techniques. For a Clauser-Horne-Shimony-Holt inequality, it emulates the CHSH
violation predicted by quantum mechanics up to $\eta_{\text{T}}$. For the
Garg-Mermin inequality - re-calibrated by incorporating non-detection events -
our method emulates its exact local bound at any efficiency above the
threshold. This confirms that attacks on secure quantum communication protocols
based on Bell violation is a real threat if the detection efficiency loophole
is not closed.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat