Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zeptonewton force sensing with squeezed quadratic optomechanics   Cavity optomechanical (COM) sensors, as powerful tools for measuring
ultraweak forces or searching for dark matter, have been implemented to date
mainly using linear COM couplings. Here, quantum force sensing is explored by
using a quadratic COM system which is free of bistability and allows accurate
measurement of mechanical energy. We find that this system can be optimized to
achieve a force sensitivity $7$ orders of magnitude higher than any
conventional linear COM sensor, with experimentally accessible parameters.
Further integrating a quadratic COM system with a squeezing medium can lead to
another $3$ orders enhancement, well below the standard quantum limit and
reaching the zeptonewton level. This opens new prospects of making and using
quantum nonlinear COM sensors in fundamental physics experiments and in a wide
range of applications requiring extreme sensitivity.

33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph