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

Author:

Yamauchi Akio1ORCID,Tanaka Kentaro1ORCID,Fuki Masaaki23ORCID,Fujiwara Saiya4ORCID,Kimizuka Nobuo15ORCID,Ryu Tomohiro6ORCID,Saigo Masaki6,Onda Ken6ORCID,Kusumoto Ryota7ORCID,Ueno Nami8,Sato Harumi8ORCID,Kobori Yasuhiro237ORCID,Miyata Kiyoshi36ORCID,Yanai Nobuhiro1359ORCID

Affiliation:

1. Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.

2. Molecular Photoscience Research Center, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.

3. CREST, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan.

4. RIKEN, RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan.

5. Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.

6. Department of Chemistry, Graduate School of Science, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.

7. Department of Chemistry, Graduate School of Science, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.

8. Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe 657-8501, Japan.

9. FOREST, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan.

Abstract

Singlet fission can generate an exchange-coupled quintet triplet pair state 5 TT, 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 5 TT 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 singlet fission–derived 5 TT in a chromophore-integrated metal-organic framework can be over hundred nanoseconds at room temperature. The suppressed motion of the chromophores in ordered domains within the metal-organic framework leads to the enough fluctuation of the exchange interaction necessary for 5 TT generation but, at the same time, does not cause severe 5 TT decoherence. Furthermore, the phase and amplitude of quantum beating depend on the molecular motion, opening the way to room-temperature molecular quantum computing based on multiple quantum gate control.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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