Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Loschmidt Echo for quantum metrology   We propose a versatile Loschmidt echo protocol to detect and quantify
multiparticle entanglement. It allows us to extract the quantum Fisher
information for arbitrary pure states, and finds direct application in quantum
metrology. In particular, the protocol applies to states that are generally
difficult to characterize, as non-Gaussian states, and states that are not
symmetric under particle exchange. We focus on atomic systems, including
trapped ions, polar molecules, and Rydberg atoms, where entanglement is
generated dynamically via long-range interaction, and show that the protocol is
stable against experimental detection errors.

32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat