Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental measurement-device-independent quantum digital signatures
  over a metropolitan network   Quantum digital signatures (QDS) provide a means for signing electronic
communications with informationtheoretic security. However, all previous
demonstrations of quantum digital signatures assume trusted measurement
devices. This renders them vulnerable against detector side-channel attacks,
just like quantum key distribution. Here, we exploit a
measurement-device-independent (MDI) quantum network, over a
200-square-kilometer metropolitan area, to perform a field test of a
three-party measurement-device-independent quantum digital signature (MDI-QDS)
scheme that is secure against any detector side-channel attack. In so doing, we
are able to successfully sign a binary message with a security level of about
1E-7. Remarkably, our work demonstrates the feasibility of MDI-QDS for
practical applications.

29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin