Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Integrated Server for Measurement-Device-Independent Quantum Key
  Distribution Network   Quantum key distribution (QKD), harnessing quantum physics and
optoelectronics, may promise unconditionally secure information exchange in
theory. Recently, theoretical and experimental advances in
measurement-device-independent (MDI-) QKD have successfully closed the physical
backdoor in detection terminals. However, the issues of scalability, stability,
cost and loss prevent QKD systems from widespread application in practice.
Here, we propose and experimentally demonstrate a solution to build a
star-topology quantum access network with an integrated server. By using
femtosecond laser direct writing technique, we construct integrated circuits
for all the elements of Bell state analyzer together and are able to integrate
several such analyzers on single photonic chip. The measured high-visibility
Bell state analysis suggests integrated server a promising platform for the
practical application of MDI-QKD network.

30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex