Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Capacitative coupling of singlet-triplet qubits in different inter-qubit
  geometries   In the singlet-triplet qubit architecture, the two-qubit interactions
required in universal quantum computing can be implemented by capacitative
coupling, by exploiting the charge distribution differences of the singlet and
triplet states. The efficiency of this scheme is limited by decoherence, that
can be mitigated by stronger coupling between the qubits. In this paper, we
study the capacitative coupling of singlet-triplet qubits in different
geometries of the two-qubit system. The effects of the qubit-qubit distance and
the relative orientation of the qubits on the capacitative coupling strength
are discussed using an accurate microscopic model and exact diagonalization of
it. We find that the trapezoidal quantum dot formations allow strong coupling
with low charge distribution differences between the singlet and triplet
states. The analysis of geometry on the capacitative coupling is also extended
to the many-qubit case and the creation of cluster states.

34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga