Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-electron quantum dots as scalable qubits   We show that two electrons confined in a square semiconductor quantum dot
have two isolated low-lying energy eigenstates, which have the potential to
form the basis of scalable computing elements (qubits). Initialisation,
one-qubit and two-qubit universal gates, and readout are performed using
electrostatic gates and magnetic fields. Two-qubit transformations are
performed via the Coulomb interaction between electrons on adjacent dots.
Choice of initial states and subsequent asymmetric tuning of the tunnelling
energy parameters on adjacent dots control the effect of this interaction.

1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th