Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coupled cavities for enhancing the cross-phase modulation in
  electromagnetically induced transparency   We propose an optical double-cavity resonator whose response to a signal is
similar to that of an Electromagnetically Induced Transparency (EIT) medium. A
combination of such a device with a four-level EIT medium can serve for
achieving large cross-Kerr modulation of a probe field by a signal field. This
would offer the possibility of building a quantum logic gate based on photonic
qubits. We discuss the technical requirements that are necessary for realizing
a probe-photon phase shift of Pi caused by a single-photon signal. The main
difficulty is the requirement of an ultra-low reflectivity beamsplitter and to
operate a sufficiently dense cool EIT medium in a cavity.

18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an