Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum
  dots   An anomalous energy splitting of spin triplet states at zero magnetic field
has recently been measured in germanium quantum dots. This zero-field splitting
could crucially alter the coupling between tunnel-coupled quantum dots, the
basic building blocks of state-of-the-art spin-based quantum processors, with
profound implications for semiconducting quantum computers. We develop an
analytical model linking the zero-field splitting to spin-orbit interactions
that are cubic in momentum. Such interactions naturally emerge in hole
nanostructures, where they can also be tuned by external electric fields, and
we find them to be particularly large in silicon and germanium, resulting in a
significant zero-field splitting in the $\mu$eV range. We confirm our
analytical theory by numerical simulations of different quantum dots, also
including other possible sources of zero-field splitting. Our findings are
applicable to a broad range of current architectures encoding spin qubits and
provide a deeper understanding of these materials, paving the way towards the
next generation of semiconducting quantum processors.

28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas