Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Aligning Spatial Frames Through Quantum Channels   We review the optimal protocols for aligning spatial frames using quantum
systems. The communication problem addressed here concerns a type of
information that cannot be digitalized. Asher Peres referred to it as
"unspeakable information". We comment on his contribution to this subject and
give a brief account of his scientific interaction with the authors.

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The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
19
The categories of this paper are: eess
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph