Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Near perfect mode overlap between independently seeded, gain-switched
  lasers   We drastically improve the mode overlap between independently seeded,
gain-switched laser diodes operating at gigahertz repetition rates by
implementing a pulsed light seeding technique. Injecting pulsed light reduces
the emission time jitter and enables frequency chirp synchronization while
maintaining random optical phases of the emitted laser pulses. We measure
interference of these pulsed sources both in the macroscopic regime, where we
demonstrate near perfect mode overlap, and in the single photon regime, where
we achieve a Hong-Ou-Mandel dip visibility of 0.499+/-0.004, thus saturating
the theoretical limit of 0.5. The measurement results are reproduced by
Monte-Carlo simulations with no free parameters. Our light source is an ideal
solution for generation of high rate, indistinguishable coherent pulses for
quantum information applications.

8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio