Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical decoherence and spectral diffusion in an erbium-doped silica
  glass fiber featuring long-lived spin sublevels   Understanding decoherence in cryogenically-cooled rare-earth-ion doped glass
fibers is of fundamental interest and a prerequisite for applications of these
material in quantum information applications. Here we study the coherence
properties in a weakly doped erbium silica glass fiber motivated by our recent
observation of efficient and long-lived Zeeman sublevel storage in this
material and by its potential for applications at telecommunication
wavelengths. We analyze photon echo decays as well as the potential mechanisms
of spectral diffusion that can be caused by coupling with dynamic disorder
modes that are characteristic for glassy hosts, and by the magnetic
dipole-dipole interactions between $Er^{3+}$ ions. We also investigate the
effective linewidth as a function of magnetic field, temperature and time, and
then present a model that describes these experimental observations. We
highlight that the operating conditions (0.6 K and 0.05 T) at which we
previously observed efficient spectral hole burning coincide with those for
narrow linewidths (1 MHz) { an important property for applications that has not
been reported before for a rare-earth-ion doped glass.

8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin