Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge spectrometry with a strongly coupled superconducting
  single-electron transistor   We have used a superconducting single-electron transistor as a
DC-electrometer that is strongly coupled to the metal island of another
transistor. With this set-up, it is possible to directly measure the charge
distribution on this island. The strong capacitive coupling was achieved by a
multilayer fabrication technique that allowed us to make the coupling
capacitance bigger than the junction capacitances. Simulations of this system
were done using orthodox theory of single-electron tunnelling and showed
excellent agreement with the measurements.

5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math