Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Homodyne coherent quantum noise cancellation in a hybrid optomechanical
  force sensor   In this paper, we propose an experimentally viable scheme to enhance the
sensitivity of force detection in a hybrid optomechanical setup assisted with
squeezed vacuum injection, beyond the standard quantum limit (SQL). The scheme
is based on a combination of the coherent quantum noise cancellation (CQNC)
strategy with a variational homodyne detection of the cavity output spectrum in
which the phase of the local oscillator is optimized. In CQNC, realizing a
negative-mass oscillator in the system leads to exact cancellation of the
backaction noise from the mechanics due to destructive quantum interference.
Squeezed vacuum injection enhances this cancellation and allows sub-SQL
sensitivity to be reached in a wide frequency band and at much lower input
laser powers. We show here that the adoption of variational homodyne readout
enables us to enhance this noise cancellation up to $40 ~\mathrm{dB}$ compared
to the standard case of detection of the optical output phase quadrature,
leading to a remarkable force sensitivity of the order of $10^{-19}
\mathrm{N}/\sqrt{\mathrm{Hz}}$, 2-order enhancement compared to the standard
case. Moreover, we show that at nonzero cavity detuning, the signal response
can be amplified at a level 3- to 5-times larger than that in the standard case
without variational homodyne readout, improving the signal-to-noise-ratio
(SNR).

8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom