Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental realization of Popper's Experiment: Violation of the
  Uncertainty Principle?   An entangled pair of photons (1 and 2) are emitted to opposite directions. A
narrow slit is placed in the path of photon 1 to provide precise knowledge of
its position on the $y$ axis and this also determines the precise $y$ position
of its twin, photon 2, due to quantum entanglement. Is photon 2 going to
experience a greater uncertainty in momentum, i.e., a greater $\Delta p_{y}$,
due to the precise knowledge of its position $y$? The experimental data shows
$\Delta y\Delta p_{y}<\hbar $ for photon 2. Can this recent realization of the
historical thought experiment of Karl Popper signal a violation of the
uncertainty principle?

22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio