Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coupled quantum electrodynamics in photonic crystal nanocavities   We show that a scalable photonic crystal nanocavity array, in which single
embedded quantum dots are coherently interacting, can perform as an universal
single-operation quantum gate. In a passive system, the optical analogue of
electromagnetically-induced-transparency is observed. The presence of a single
two-level system in the array dramatically controls the spectral lineshapes.
When each cavity couples with a two-level system, our scheme achieves two-qubit
gate operations with high fidelity and low photon loss, even in the bad cavity
limit and with non-ideal detuning and decoherence.

2
The categories of this paper are: math
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org