Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A millikelvin all-fiber cavity optomechanical apparatus for merging with
  ultra-cold atoms in a hybrid quantum system   We describe the construction of an apparatus designed to realize a hybrid
quantum system comprised of a cryogenically cooled mechanical oscillator and
ultra-cold $^{87}$Rb atoms coupled via light. The outstanding feature of our
instrument is an in-situ adjustable asymmetric all-fiber membrane-in-the-middle
cavity located inside an ultra-high vacuum dilution refrigerator based
cryostat. We show that Bose-Einstein condensates of $N=2\times10^6$ atoms can
be produced in less than 20 s and demonstrate a single photon optomechanical
coupling strength of $g_0=2\pi\times9$ kHz employing a high-stress Si$_3$N$_4$
membrane with a mechanical quality factor $Q_{\rm m}>10^7$ at a cavity set-up
temperature of $T_{\rm MiM}=480$ mK.

4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph