Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weak Interaction Processes: Which Quantum Information is revealed?   We analyze the achievable limits of the quantum information processing of the
weak interaction revealed by hyperons with spin. We find that the weak decay
process corresponds to an interferometric device with a fixed visibility and
fixed phase difference for each hyperon. Nature chooses rather low visibilities
expressing a preference to parity conserving or violating processes (except for
the decay $\Sigma^+\longrightarrow p \pi^0$). The decay process can be
considered as an open quantum channel that carries the information of the
hyperon spin to the angular distribution of the momentum of the daughter
particles. We find a simple geometrical information theoretic interpretation of
this process: two quantization axes are chosen spontaneously with probabilities
$\frac{1\pm\alpha}{2}$ where $\alpha$ is proportional to the visibility times
the real part of the phase shift. Differently stated the weak interaction
process corresponds to spin measurements with an imperfect Stern-Gerlach
apparatus. Equipped with this information theoretic insight we show how
entanglement can be measured in these systems and why Bell's nonlocality (in
contradiction to common misconception in literature) cannot be revealed in
hyperon decays. We study also under which circumstances contextuality can be
revealed.

32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat