Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-photon quantum interference from separate nitrogen vacancy centers
  in diamond   We report on the observation of quantum interference of the emission from two
separate nitrogen vacancy (NV) centers in diamond. Taking advantage of
optically induced spin polarization in combination with polarization filtering,
we isolate a single transition within the zero-phonon line of the
non-resonantly excited NV centers. The time-resolved two-photon interference
contrast of this filtered emission reaches 66%. Furthermore, we observe quantum
interference from dissimilar NV centers tuned into resonance through the dc
Stark effect. These results pave the way towards measurement-based entanglement
between remote NV centers and the realization of quantum networks with
solid-state spins.

26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th