Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Significant-loophole-free test of Kochen-Specker contextuality using two
  species of atomic-ions   Quantum measurements cannot be thought of as revealing preexisting results,
even when they do not disturb any other measurement in the same trial. This
feature is called contextuality and is crucial for the quantum advantage in
computing. Here, we report the first observation of quantum contextuality
simultaneously free of the detection, sharpness and compatibility loopholes.
The detection and sharpness loopholes are closed by adopting a hybrid two-ion
system and highly efficient fluorescence measurements offering a detection
efficiency of $100\%$ and a measurement repeatability $>98\%$. The
compatibility loophole is closed by targeting correlations between observables
for two different ions in a Paul trap, a $^{171}\mathrm{Yb}^{+}$ ion and a
$^{138}\mathrm{Ba}^{+}$ ion, chosen so measurements on each ion use different
operation laser wavelengths, fluorescence wavelengths, and detectors. The
experimental results show a violation of the bound for the most adversarial
noncontextual models and open a new way to certify quantum systems.

11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con