Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-photon entanglement in multi-qubit bi-directional waveguide QED   We study entanglement generation and control in bi-directional waveguide QED
driven by a two photon Gaussian wavepacket. In particular, we focus on how
increasing the number of qubits affects the overall average pairwise
entanglement in the system. We also investigate how the presence of a second
photon can introduce non-linearities, thereby manipulating the generated
entanglement. In addition, we show that through the introduction of chirality
and small decay rates, entanglement can be stored and enhanced up to factors of
2 and 3, respectively. Finally, we analyze the influence of finite detunnings
and time-delays on the generated entanglement.

3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph