Article (Scientific journals)
Coherent quantum dynamics launched by incoherent relaxation in a quantum circuit simulator of light harvesting complex
Chin, Alex; Mangaud, Etienne; Atabek, Osman et al.
2018In Physical Review. A
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Keywords :
coherence; HEOM; dissipative dynamics
Abstract :
[en] Engineering and harnessing coherent excitonic transport in organic nanostructures has recently been suggested as a promising way towards improving manmade light-harvesting materials. However, realizing and testing the dissipative system-environment models underlying these proposals is presently very challenging in supramolecular materials. A promising alternative is to use simpler and highly tunable “quantum simulators” built from programmable qubits, as recently achieved in a superconducting circuit by Potočnik et al. [A. Potočnik et al., Nat. Commun. 9, 904 (2018)]. We simulate the real-time dynamics of an exciton coupled to a quantum bath as it moves through a network based on the quantum circuit of Potočnik et al. Using the numerically exact hierarchical equations of motion to capture the open quantum system dynamics, we find that an ultrafast but completely incoherent relaxation from a high-lying “bright” exciton into a doublet of closely spaced “dark” excitons can spontaneously generate electronic coherences and oscillatory real-space motion across the network (quantum beats). Importantly,we showthat this behavior also surviveswhen the environmental noise is classically stochastic (effectively high temperature), as in present experiments. These predictions highlight the possibilities of designing matched electronic and spectral noise structures for robust coherence generation that do not require coherent excitation or cold environments.
Disciplines :
Physics
Chemistry
Author, co-author :
Chin, Alex;  Paris Sorbonne
Mangaud, Etienne;  Paris Sorbonne
Atabek, Osman;  Université Paris-Sud
Desouter, Michèle ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Coherent quantum dynamics launched by incoherent relaxation in a quantum circuit simulator of light harvesting complex
Publication date :
2018
Journal title :
Physical Review. A
ISSN :
2469-9926
eISSN :
2469-9934
Publisher :
American Physical Society, College Park, United States - Maryland
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 21 June 2018

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