Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Three-Particle Quantum Nonlocality under Strict Locality
  Conditions   Quantum correlations are critical to our understanding of nature, with
far-reaching technological and fundamental impact. These often manifest as
violations of Bell's inequalities, bounds derived from the assumptions of
locality and realism, concepts integral to classical physics. Many tests of
Bell's inequalities have studied pairs of correlated particles; however, the
immense interest in multi-particle quantum correlations is driving the
experimental frontier to test systems beyond just pairs. All experimental
violations of Bell's inequalities to date require supplementary assumptions,
opening the results to one or more loopholes, the closing of which is one of
the most important challenges in quantum science. Individual loopholes have
been closed in experiments with pairs of particles and a very recent result
closed the detection loophole in a six ion experiment. No experiment thus far
has closed the locality loopholes with three or more particles. Here, we
distribute three-photon Greenberger-Horne-Zeilinger entangled states using
optical fibre and free-space links to independent measurement stations. The
measured correlations constitute a test of Mermin's inequality while closing
both the locality and related freedom-of-choice loopholes due to our
experimental configuration and timing. We measured a Mermin parameter of 2.77
+/- 0.08, violating the inequality bound of 2 by over 9 standard deviations,
with minimum tolerances for the locality and freedom-of-choice loopholes of 264
+/- 28 ns and 304 +/- 25 ns, respectively. These results represent a
significant advance towards definitive tests of the foundations of quantum
mechanics and practical multi-party quantum communications protocols.

11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
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The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics