Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Realizing highly entangled states in asymmetrically coupled three NV
  centers at room temperature   Despite numerous efforts the coupling between randomly arranged multi-NV
centers and also resonators has not been improved significantly mainly due to
our limited knowledge of their entanglement times (2t_ent). Here, we
demonstrate a very strong coupling between three-NV centers by using a
simulated triple electron-electron resonance experiment based on a new quantum
(U_C) gate on IBM quantum simulator with 2t_ent ~12.5 microsecond arranged is a
triangular configuration. Interestingly through breaking the symmetry of
couplings an even lower 2t_ent ~6.3 {\mu}s can be achieved. This simulation not
only explains the luminescence spectra in recently observed three-NV centers
[Haruyama, Nat. Commun. 2019] but also shows a large improvement of the
entanglement in artificially created structures through a cyclic redistribution
of couplings. Realistically disordered coupling configurations of NV centers
qubits with short time periods and high (0.89-0.99) fidelity of states clearly
demonstrate possibility of accurate quantum registers operated at room
temperature.

23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin