Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detecting multi-spin interaction of an XY spin chain by geometric phase
  of a coupled qubit   We investigate geometric phase (GP) of a qubit symmetrically coupled to a XY
spin chain with three-spin interaction in a transverse magnetic field. An
analytical expression for the GP is found in the weak coupling limit. It is
shown that the GP displays a sharp peak or dip around the quantum phase
transition (QPT) point of the spin chain. Without the three-spin interaction,
the GP has a peak or dip around the critical point $\lambda=1$. If the
three-spin interaction exists, the peak or dip position is obviously shifted
away from the original position. This result reveals that the GP may be taken
as an observable to detect both the existence and strength of multi-spin
interaction in a spin chain.

3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
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The categories of this paper are: math
32
The categories of this paper are: atom-ph