Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement-Device-Independent Twin-Field Quantum Key Distribution   The ultimate aim of quantum key distribution (QKD) is improving the
performance of transmission distance and key generation speed. Unfortunately,
it is believed to be limited by the secret-key capacity of quantum channel
without quantum repeater. Recently, a novel twin-field QKD (TFQKD) [Nature 557,
400 (2018)] is proposed to break through the limit, where the key rate is
proportional to the square-root of channel transmittance. Here, by using the
vacuum and one-photon state as a qubit, we show that the TF-QKD can be regarded
as a measurement-device-independent QKD (MDI-QKD) with single-photon Bell state
measurement. Therefore, the MDI property of TF-QKD can be understood clearly.
Importantly, the universal security proof theories can be directly used for the
TF-QKD, such as BB84, six-state and reference-frame-independent schemes.
Furthermore, we propose a feasible experimental scheme for the
proof-of-principle experimental demonstration.

18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex