Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Role of flow of information in the speedup of quantum evolution   The quantum evolution can be accelerated in non-Markovian environment.
Previous results showed that the formation of system-environment bound state
governs the quantum speedup. Although a stronger bound state in the
system-environment spectrum may seem like it should cause greater speed of
evolution, this seemingly intuitive thinking may not always be correct. We
illustrate this by investigating a qubit driven by a classical field and
coupled to a photonic crystal waveguide in the presence of a mirror. The
perfect mirror can force part of the emitted light to return back to the qubit,
and thus induce non-Markovian dynamics. Within the considered model, we show
how the evolution speed is influenced by the memory time and the classical
driving strength. In particular, we find that the formation of bound state is
not the essential reason for the acceleration of evolution. The quantum speedup
is attributed to the flow of information, regardless of the direction in which
the information flows. Our conclusion can also be used to other non-Markovian
environments.

16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
18
The categories of this paper are: econ