Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Error Mitigation in Quantum Computers subject to Spatially Correlated
  Noise   The most common error models for quantum computers assume the independence of
errors on different qubits. However, most noise mechanisms have some
correlations in space. We show how to improve quantum information processing
for few-qubit systems when spatial correlations are present. This starts with
strategies to measure the correlations. Once the correlations have been
determined, we can give criteria to assess the suitability of candidate quantum
circuits to carry out a given task. This is achieved by defining measures of
decoherence that are local in Hilbert space, identifying "good" and "bad"
regions of the space. Quantum circuits that stay in the "good" regions are
superior. Finally, we point out ways in which the improvement of few-qubit
systems can be extended to large-scale quantum computation. The basic
conceptual theme of the work is the generalization of the concept of
decoherence-free subspaces in order to treat the case of arbitrary spatial
correlations.

21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol