Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonperturbative approach to relativistic quantum communication channels   We investigate the transmission of both classical and quantum information
between two arbitrary observers in globally hyperbolic spacetimes using a
quantum field as a communication channel. The field is supposed to be in some
arbitrary quasifree state and no choice of representation of its canonical
commutation relations is made. Both sender and receiver possess some localized
two-level quantum system with which they can interact with the quantum field to
prepare the input and receive the output of the channel, respectively. The
interaction between the two-level systems and the quantum field is such that
one can trace out the field degrees of freedom exactly and thus obtain the
quantum channel in a nonperturbative way. We end the paper determining the
unassisted as well as the entanglement-assisted classical and quantum channel
capacities.

16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
3
The categories of this paper are: physics