Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal efficiency of quantum transport in a disordered trimer   Disordered quantum networks, as those describing light-harvesting complexes,
are often characterized by the presence of peripheral ring-like structures,
where the excitation is initialized, and inner reaction centers (RC), where the
excitation is trapped. The peripheral rings display coherent features: their
eigenstates can be separated in the two classes of superradiant and subradiant
states. Both are important to optimize transfer efficiency. In the absence of
disorder, superradiant states have an enhanced coupling strength to the RC,
while the subradiant ones are basically decoupled from it. Static on-site
disorder induces a coupling between subradiant and superradiant states,
creating an indirect coupling to the RC. The problem of finding the optimal
transfer conditions, as a function of both the RC energy and the disorder
strength, is very complex even in the simplest network, namely a three-level
system. In this paper we analyze such trimeric structure choosing as initial
condition a subradiant state, rather than the more common choice of an
excitation localized on a site. We show that, while the optimal disorder is of
the order of the superradiant coupling, the optimal detuning between the
initial state and the RC energy strongly depends on system parameters: when the
superradiant coupling is much larger than the energy gap between the
superradiant and the subradiant levels, optimal transfer occurs if the RC
energy is at resonance with the subradiant initial state, whereas we find an
optimal RC energy at resonance with a virtual dressed state when the
superradiant coupling is smaller than or comparable with the gap. The presence
of dynamical noise, which induces dephasing and decoherence, affects the
resonance structure of energy transfer producing an additional 'incoherent'
resonance peak, which corresponds to the RC energy being equal to the energy of
the superradiant state.

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The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an