Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-photon bosonic coalescence in an integrated tritter   The main features of quantum mechanics reside in interference deriving from
the superposition of different quantum objects. While current quantum optical
technology enables two-photon interference both in bulk and integrated systems,
simultaneous interference of more than two particles, leading to richer quantum
phenomena, is still a challenging task. Here we report the experimental
observation of three-photon interference in an integrated three-port
directional coupler realized by ultrafast laser-writing. By exploiting the
capability of this technique to produce three-dimensional structures, we
realized and tested in the quantum regime a three-port beam splitter, namely a
tritter, which allowed us to observe bosonic coalescence of three photons.
These results open new important perspectives in many areas of quantum
information, such as fundamental tests of quantum mechanics with increasing
number of photons, quantum state engineering, quantum sensing and quantum
simulation.

17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc