Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Feedback-enhanced parametric squeezing of mechanical motion   We present a single-quadrature feedback scheme able to overcome the
conventional 3 dB limit on parametric squeezing. The method is experimentally
demonstrated in a micromechanical system based on a cantilever with a magnetic
tip. The cantilever is detected at low temperature by a SQUID susceptometer,
while parametric pumping is obtained by modulating the magnetic field gradient
at twice the cantilever frequency. A maximum squeezing of 11.5 dB and 11.3 dB
is observed, respectively in the response to a sinusoidal test signal and in
the thermomechanical noise. The maximum squeezing factor is limited only by the
maximum achievable parametric modulation. The proposed technique can be used to
squeeze one quadrature of a mechanical resonator below the quantum noise level,
even without the need for a quantum limited detector.

15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th