Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precision calculation of blackbody radiation shifts for optical
  frequency metrology   We show that three group IIIB divalent ions, B+, Al+, and In+, have
anomalously small blackbody radiation (BBR) shifts of the ns^2 1S0 - nsnp 3P0
clock transitions. The fractional BBR shifts for these ions are at least 10
times smaller than those of any other present or proposed optical frequency
standards at the same temperature, and are less than 0.3% of the Sr clock
shift. We have developed a hybrid configuration interaction + coupled-cluster
method that provides accurate treatment of correlation corrections in such
ions, considers all relevant states in the same systematic way, and yields a
rigorous upper bound on the uncertainty of the final results. We reduce the BBR
contribution to the fractional frequency uncertainty of the Al+ clock to 4
\times 10^{-19} at T=300K. We also reduce the uncertainties due to this effect
at room temperature to 10^{-18} level for B+ and In+ to facilitate further
development of these systems for metrology and quantum sensing. These
uncertainties approach recent estimates of the feasible precision of currently
proposed optical atomic clocks.

36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga