Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum optical diode with semiconductor microcavities   The semiconductor diode, which acts as an electrical rectifier and allows
unidirectional electronic transports, is the key to information processing in
integrated circuits. Analogously, an optical rectifier (or diode) working at
specific target wavelengths has recently becomes a dreaming device in optical
communication and signal processing. In this paper, we propose a scheme to
realize an optical diode for photonic transport at the level of few photons.
The system consists of two spatially overlapping single-mode semiconductor
microcavities coupled via ${\chi ^{(2)}}$ nonlinearities. The photon blockade
is predicted to take place in this system. These photon blockade effects can be
achieved by tuning the frequency of the input laser field (driving field).
Based on those blockades, we derive analytically the single- and two-photon
current in terms of zero and finite-time delayed two-order correlation
function. The results suggest that the system can serve as an single- and
two-photon quantum optical diodes which allow transmission of photons in one
direction much more efficiently than in the other.

20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg