Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of a trapped atom clock on a chip   We present a compact atomic clock interrogating ultracold 87Rb magnetically
trapped on an atom chip. Very long coherence times sustained by spin
self-rephasing allow us to interrogate the atomic transition with 85% contrast
at 5 s Ramsey time. The clock exhibits a fractional frequency stability of
$5.8\times 10^{-13}$ at 1 s and is likely to integrate into the
$1\times10^{-15}$ range in less than a day. A detailed analysis of 7 noise
sources explains the measured frequency stability. Fluctuations in the atom
temperature (0.4 nK shot-to-shot) and in the offset magnetic field
($5\times10^{-6}$ relative fluctuations shot-to-shot) are the main noise
sources together with the local oscillator, which is degraded by the 30% duty
cycle. The analysis suggests technical improvements to be implemented in a
future second generation set-up. The results demonstrate the remarkable degree
of technical control that can be reached in an atom chip experiment.

35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat