Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measuring and Suppressing Error Correlations in Quantum Circuits   Quantum error correction provides a path to large-scale quantum computers,
but is built on challenging assumptions about the characteristics of the
underlying errors. In particular, the mathematical assumption of independent
errors in quantum logic operations is at odds with realistic environments where
error-sources may exhibit strong temporal correlations. We present experiments
enabling the identification of error correlations between operations in quantum
circuits, using only projective measurements at the end of the circuit. Using a
single trapped ion qubit and engineered noise with tunable temporal
correlations, we identify a clear signature of error correlations between
sequential gates in randomly composed quantum circuits, and extract
quantitative measures linked to the underlying noise correlation length. By
replacing all gates in these circuits with "virtual" dynamically corrected
gates (DCGs), we demonstrate that even in the presence of strongly correlated
noise the signatures of error correlations between sequential gates appear
similar to standard gates exposed to uncorrelated noise. A theoretical model
applied to our experiments reveals that common DCGs suppress the correlated
error component by over $270\times$ with $95\%$ confidence. Using
block-correlated noise, we explore the scaling of the effective error
correlation length at the virtual level, and show that DCGs exhibit error
correlations indistinguishable from those arising from uncorrelated noise.

20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph