Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental superradiance and slow light effects for quantum memories   The effects of high optical depth phenomena, such as superradiance, are
investigated in potential quantum memory materials. The results may have
relevance for several schemes, including CRIB, AFC and EIT-based quantum
memories, which are based on using ensembles as storage media. It is shown that
strong superradiant effects, manifested as decay rates larger than 1/T2*, are
present even for moderate values of alphaL < 5, and increases as a function of
alphaL. For even higher alphaL, effects like off-resonant slow light is
demonstrated and discussed, and finally, the efficiency of time-reversed
optimized input pulses are tested. A maximum retrieval efficiency of ~20% is
reached, and agreement with the theoretically expected result is discussed.

16
The categories of this paper are: stat
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas