Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlinear interaction of two photons at a one-dimensional atom:
  spatiotemporal quantum coherence in the emitted field   The nonlinear photon-photon interaction mediated by a single two-level atom
is studied theoretically based on a one-dimensional model of the field-atom
interaction. This model allows us to determine the effects of an atomic
nonlinearity on the spatiotemporal coherence of a two photon state.
Specifically, the complete two photon output wave function can be obtained for
any two photon input wave function. It is shown that the quantum interference
between the components of the output state associated with different
interaction processes causes bunching and anti-bunching in the two photon
statistics. This theory may be useful for various applications in photon
manipulation, e.g. quantum information processing using photonic qubits,
quantum nondemolition measurements, and the generation of entangled photons.

0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph