Long-Lived Quantum Coherence in Photosynthetic Apparatus and the Quantum Heat Engine Aspect
Hong-Bin Chen1*, Pin-Yi Chiu1, Yueh-Nan Chen1,2
1Department of Physics, National Cheng Kung University, Tainan, Taiwan
2Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan
* presenting author:Hong-Bin Chen, email:hongbinchen@phys.ncku.edu.tw
Photosynthesis has been a long-standing research interest due to its fundamental importance. Recently, studies
on photosynthesis processes also have inspired attention from a thermodynamical aspect when considering
photosynthetic apparatuses as biological quantum heat engines. Quantum coherence is shown to play a crucial
role in enhancing the performance of these quantum heat engines. Based on the experimentally reported structure,
we propose a quantum heat engine model with a non-Markovian vibrational mode. We show that one can obtain
a performance enhancement easily for a wide range of parameters in the presence of the vibrational mode. Our
results provide insights into the photosynthetic processes and a design principle mimicking natural organisms.

Keywords: quantum coherence, photosynthesis, quantum heat engine