Effect of Time-Delayed Feedback on the Interaction of a Dimer System with its Environment

Area of Science:

• Quantum physics
• Quantum information science
• Biophysics

Background:

• Open quantum systems often exhibit Markovian behavior, simplifying analysis.
• Photosynthetic systems display complex dynamics influenced by environmental interactions.
• Quantum coherence plays a crucial role in efficient energy transfer in biological systems.

Purpose of the Study:

• To model non-Markovian open quantum systems with time-delayed environmental interactions.
• To investigate the impact of these time delays on quantum coherence and excitation dynamics.
• To explore potential applications in understanding photosynthetic energy transfer and artificial photovoltaics.

Main Methods:

• Development of a theoretical model for an excitonic dimer with memory effects.
• Simulation of quantum dynamics in the femtosecond timescale relevant to photosynthesis.
• Analysis of the influence of time-delayed interactions on coherence and system-environment coupling.

Main Results:

• Quantum coherence is sustained for durations proportional to the time delays.
• Environmental coupling can be reduced by accounting for time delays, contrary to previous assumptions.
• The findings suggest a novel mechanism for controlling quantum dynamics in open systems.

Conclusions:

• Time-delayed interactions in non-Markovian systems offer a new route to preserve quantum coherence.
• This approach provides enhanced control over experimental parameters for studying energy transfer.
• Potential applications include improved models of photosynthesis and advancements in artificial photovoltaic devices.