Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal spin- and planar-quantum squeezing in superpositions of spin
  coherent states   We investigate the presence of spin- and planar- squeezing in generalized
superpositions of atomic (or spin) coherent states (ACS). Spin-squeezing has
been shown to be a useful tool in determining the presence of entanglement in
multipartite systems, such as collections of two-level atoms, as well as being
an indication of reduced projection noise and sub-shot-noise limited phase
uncertainty in Ramsey spectroscopy, suitable for measuring phases $\phi\sim 0$.
On the other hand, planar-squeezed states display reduced projection noise in
two directions simultaneously and have been shown to lead to enhanced
metrological precision in measuring phases without the need for explicit prior
knowledge of the phase value. In this paper, we show that the generalized
superposition state can be parametrized to display both spin-squeezing along
all orthogonal axes and planar-squeezing along all orthogonal planes for all
values of $J>1/2$. We close with an application of the maximally spin- and
planar-squeezed states to quantum metrology.

3
The categories of this paper are: physics
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol