Room-temperature quantum coherence of entangled multiexcitons in a metal-organic framework

Singlet fission (SF) can generate an exchange-coupled quintet triplet pair state 5TT, which could lead to the realization of quantum computing and quantum sensing using entangled multiple qubits even at room temperature. However, the observation of the quantum coherence of 5TT has been limited to cr...

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Bibliographic Details
Published in:ChemRxiv 2023-04
Main Authors: Yamauchi, Akio, Tanaka, Kentaro, Fuki, Masaaki, Fujiwara, Saiya, Kimizuka, Nobuo, Ryu, Tomohiro, Saigo, Masaki, Onda, Ken, Kobori, Yasuhiro, Miyata, Kiyoshi, Yanai, Nobuhiro
Format: Article
Language:English
Subjects:
Chain dynamics
Chemistry
Chromophores
Coherence
Cryogenic temperature
Materials Chemistry
Materials Science
Metal-organic frameworks
Molecular motion
Photochemistry (Physical Chem.)
Physical and Chemical Properties
Physical Chemistry
Quantum computing
Quantum phenomena
Qubits (quantum computing)
Room temperature
Spectroscopy (Physical Chem.)
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Summary:Singlet fission (SF) can generate an exchange-coupled quintet triplet pair state 5TT, which could lead to the realization of quantum computing and quantum sensing using entangled multiple qubits even at room temperature. However, the observation of the quantum coherence of 5TT has been limited to cryogenic temperatures, and the fundamental question is what kind of material design will enable its room-temperature quantum coherence. Here we show that the quantum coherence of SF-derived 5TT in a chromophore-integrated metal-organic framework (MOF) can be over hundred nanoseconds at room temperature. The subtle motion of the chromophores in the MOF leads to the enough fluctuation of the exchange interaction necessary for 5TT generation, but at the same time does not cause severe 5TT decoherence. Furthermore, the phase and amplitude of quantum beating can be controlled by molecular motion, opening the way to room-temperature molecular quantum computing based on multiple quantum gate control.
ISSN:2573-2293
DOI:10.26434/chemrxiv-2023-nz6rz