Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prospects and challenges for squeezing-enhanced optical atomic clocks   We have investigated the benefits of spin squeezed states for clocks operated
with typical Brownian frequency noise-limited laser sources. Based on an
analytic model of the closed servo-loop of an optical atomic clock, we can give
quantitative predictions on the optimal clock stability for a given dead time
and laser noise. Our analytic predictions are in very good agreement with
numerical simulations of the closed servo-loop. We find that for usual cyclic
Ramsey interrogation of single atomic ensembles with dead time, even with the
current most stable lasers spin squeezing can only improve the clock stability
for ensembles below a critical atom number of about one thousand in an optical
Sr lattice clock. Even with a future improvement of the laser performance by
one order of magnitude the critical atom number still remains below 100,000. In
contrast, clocks based on smaller, non-scalable ensembles, such as ion clocks,
can already benefit from squeezed states with current clock lasers.

1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
29
The categories of this paper are: funct-an