Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unified generation and fast emission of arbitrary single-photon
  multimode $W$ states   We propose a unified and deterministic scheme to generate arbitrary
single-photon multimode $W$ states in circuit QED. A three-level system
(qutrit) is driven by a pump-laser pulse and coupled to $N$ spatially separated
resonators. The coupling strength for each spatial mode $g_i$ totally decide
the generated single-photon N-mode $W$ state $\vert W_N
\rangle=\frac{1}{A}\sum_{i=1}^N g_i|0_1 0_2 \cdots 1_i 0_{i+1}\cdots
0_N\rangle$, so arbitrary $\vert W_N \rangle$ can be generated just by tuning
$g_i$. We could not only generate $W$ states inside resonators but also release
them into transmission lines on demand. The time and fidelity for generating
(or emitting) $\vert W_N \rangle$ can both be the same for arbitrary $N$.
Remarkably, $\vert W_N\rangle$ can be emitted with probability reaching
$98.9\%$ in $20-50$ ns depending on parameters, comparable to the recently
reported fastest two-qubit gate ($30-45$ ns). Finally, the time evolution
process is convenient to control since only the pump pulse is time-dependent.

27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th