Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient quantum memory using a weakly absorbing sample   A light-storage experiment with a total (storage and retrieval) efficiency
$\eta=58 \pm 5%$ is carried out by enclosing a sample, with a single pass
absorption of 10%, in an impedance-matched cavity. The experiment is carried
out using the Atomic Frequency Comb (AFC) technique in a praseodymium-doped
crystal ($0.05%Pr^{3+}:Y_2SiO_5$) and the cavity is created by reflection
coating the crystal surfaces. The AFC technique has previously by far
demonstrated the highest multi-mode capacity of all quantum memory concepts
tested experimentally. We claim that the present work shows that it is
realistic to create efficient, on-demand, long storage time AFC memories.

25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph