Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conventional and unconventional photon blockade effects in an
  atom-cavity system   A two-level system interacting with a cavity field is an important model for
investigating the photon blockade (PB) effect. Most work on this topic has been
based on the assumption that the atomic transition frequency is resonant with
the fundamental mode frequency of the cavity. We relax this constraint and
reexamine PB in a more general atom--cavity system with arbitrary atomic and
cavity detunings from a driving field. The results show that when the signs of
the atomic and cavity detunings are the same, PB occurs only in the
strong-coupling regime, but for opposite signs of the atomic and cavity
detunings, strong photon antibunching is observed in both the weak- and
strong-coupling regimes and a better PB effect is achieved compared with the
case when the signs are the same. More interestingly, we find that this PB
arises from quantum interference for both weak and strong nonlinearities. These
results deepen our understanding of the underlying mechanism of PB and may be
help in the construction of single-photon sources with higher purity and better
flexibility using atom--cavity systems.

21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an