Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Breaking rotational symmetry in a trapped-ion quantum tunneling rotor   A trapped-ion quantum tunneling rotor (QTR) is in a quantum superposition of
two different Wigner crystal orientations. In a QTR system, quantum tunneling
drives the coherent transition between the two different Wigner crystal
orientations. We theoretically study the quantum dynamics of a QTR,
particularly when the spin state of one of the ions is flipped. We show that
the quantum dynamics of an $\it{N}$-ion QTR can be described by continuous-time
cyclic quantum walks. We also investigate the quantum dynamics of the QTR in a
magnetic field. Flipping the spin state breaks the rotational symmetry of the
QTR, making the quantum-tunneling-induced rotation distinguishable. This
symmetry breaking creates coupling between the spin state of the ions and the
rotational motion of the QTR, resulting in different quantum tunneling
dynamics.

11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio