Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The second order magnetic field gradient induced strong coupling between
  nitrogen-vacancy centers and a mechanical oscillator   We consider a cantilever mechanical oscillator(MO) made of diamond. There is
a nitrogen-vacancy(NV) center at the end of the cantilever. Two magnetic tips
induce strong second order magnetic field gradient near the NV center. Under a
coherent driving on MO, we find that the coupling between the MO and the NV
center can be greatly enhanced. We studied how to realize quantum state
transfer between MO and NV center and generate entanglement between them. We
also proposed a scheme to generate the two-mode squeezing between different MO
modes by coupling them to the same NV center. The decoherence and dissipation
effects for both MO and NV center are numerically calculated by taking the
present experimental parameters. It is found that high fidelity quantum state
transfer, entanglement generation, and large two-mode squeezing could be
achieved.

21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
16
The categories of this paper are: stat
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th