Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced Multi-Qubit Phase Estimation in Noisy Environments by Local
  Encoding   The first generation of multi-qubit quantum technologies will consist of
noisy, intermediate-scale devices for which active error correction remains out
of reach. To exploit such devices, it is thus imperative to use passive error
protection that meets a careful trade-off between noise protection and resource
overhead. Here, we experimentally demonstrate that single-qubit encoding can
significantly enhance the robustness of entanglement and coherence of
four-qubit graph states against local noise with a preferred direction. In
particular, we explicitly show that local encoding provides a significant
practical advantage for phase estimation in noisy environments. This
demonstrates the efficacy of local unitary encoding under realistic conditions,
with potential applications in multi-qubit quantum technologies for metrology,
multi-partite secrecy and error correction.

23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn