Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherence of single spins coupled to a nuclear spin bath of varying
  density   The dynamics of single electron and nuclear spins in a diamond lattice with
different 13C nuclear spin concentration is investigated. It is shown that
coherent control of up to three individual nuclei in a dense nuclear spin
cluster is feasible. The free induction decays of nuclear spin Bell states and
single nuclear coherences among 13C nuclear spins are compared and analyzed.
Reduction of a free induction decay time T2* and a coherence time T2 upon
increase of nuclear spin concentration has been found. For diamond material
with depleted concentration of nuclear spin, T2* as long as 30 microseconds and
T2 of up to 1.8 ms for the electron spin has been observed. The 13C
concentration dependence of T2* is explained by Fermi contact and dipolar
interactions with nuclei in the lattice. It has been found that T2 decreases
approximately as 1/n, where n is 13C concentration, as expected for an electron
spin interacting with a nuclear spin bath.

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The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an