Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum nondemolition measurement of mechanical squeezed state beyond
  the 3 dB limit   We use a reservoir engineering technique based on two-tone driving to
generate and stabilize a quantum squeezed state of a micron-scale mechanical
oscillator in a microwave optomechanical system. Using an independent
backaction evading measurement to directly quantify the squeezing, we observe
$4.7\pm0.9$ dB of squeezing below the zero-point level, surpassing the 3 dB
limit of standard parametric squeezing techniques. Our measurements also reveal
evidence for an additional mechanical parametric effect. The interplay between
this effect and the optomechanical interaction enhances the amount of squeezing
obtained in the experiment.

9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga