Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carbon Nanotube Quantum Dots with Nb Contacts   We report on the preparation of carbon nanotube quantum dots using
superconducting electrodes made of niobium. Gate-controllable supercurrents
with values of up to 30 nA are induced by the proximity effect. The IV-curves
are hysteretic at low temperature and the corresponding switching histograms
have a width of ~0.5-2. An on-chip resistive environment integrated in the
sample layout is used in order to increase the switching current.

24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph