Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Full daylight quantum-key-distribution at 1550 nm enabled by integrated
  silicon photonics   The future envisaged global-scale quantum communication network will comprise
various nodes interconnected via optical fibers or free-space channels,
depending on the link distance. The free-space segment of such a network should
guarantee certain key requirements, such as daytime operation and the
compatibility with the complementary telecom-based fiber infrastructure. In
addition, space-to-ground links will require the capability of designing light
and compact quantum devices to be placed in orbit. For these reasons,
investigating available solutions matching all the above requirements is still
necessary. Here we present a full prototype for daylight quantum key
distribution at 1550 nm exploiting an integrated silicon-photonics chip as
state encoder. We tested our prototype in the urban area of Padua (Italy) over
a 145m-long free-space link, obtaining a quantum bit error rate around 0.5% and
an averaged secret key rate of 30 kbps during a whole sunny day (from 11:00 to
20:00). The developed chip represents a cost-effective solution for portable
free-space transmitters and a promising resource to design quantum optical
payloads for future satellite missions.

37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th