Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of single photons with highly tunable wave shape from a cold
  atomic quantum memory   We report on a single photon source with highly tunable photon shape based on
a cold ensemble of Rubidium atoms. We follow the DLCZ scheme to implement an
emissive quantum memory, which can be operated as a photon pair source with
controllable delay. We find that the temporal wave shape of the emitted read
photon can be precisely controlled by changing the shape of the driving read
pulse. We generate photons with temporal durations varying over three orders of
magnitude up to 10 {\mu}s without a significant change of the read-out
efficiency. We prove the non-classicality of the emitted photons by measuring
their antibunching, showing near single photon behavior at low excitation
probabilities. We also show that the photons are emitted in a pure state by
measuring unconditional autocorrelation functions. Finally, to demonstrate the
usability of the source for realistic applications, we create ultra-long single
photons with a rising exponential or doubly peaked wave shape which are
important for several quantum information tasks.

12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat