Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrical measurement of a two-electron spin state in a double quantum
  dot   We propose a scheme for electrical measurement of two-electron spin states in
a semiconductor double quantum dot. We calculated the adiabatic charge transfer
when surface gates are modulated in time. Because of spin-orbit coupling in the
semiconductor, spatial displacement of the electrons causes a total spin
rotation. It follows that the expectation value of the transferred charge
reflects the relative phase as well as the total spin population of a prepared
singlet-triplet superposition state. The precise detection of the charge
transfer serves to identify the quantum superposition.

28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin