Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-electron emission from degenerate quantum levels   Single-electron sources on-demand are requisite for a promising fully
electronic platform for solid-state quantum information processing. Most of the
experimentally realized sources use the fact that only one electron can be
taken from a singly occupied quantum level. Here I take the next step and
discuss emission from orbitally degenerate quantum levels that arise, for
example, in quantum dots with a nontrivial ring topology. I show that
degeneracy provides additional flexibility for single- and two-electron
emission. Indeed, the small Aharonov-Bohm flux, which slightly lifts the
degeneracy, is a powerful tool for changing the relative width of the emitted
wave packets over a wide range. In a ring with one lead, even electrons emitted
from completely degenerate levels can be separated in time if the driving
potential changes at the appropriate rate. In a ring with two leads, electrons
can be emitted to different leads if one of the leads has a bound state with
Fermi energy at its end.

12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
3
The categories of this paper are: physics