Photo-induced dynamics with continuous and discrete quantum baths.

Area of Science:

• Quantum Chemistry
• Quantum Biology
• Computational Physics

Background:

• Ultrafast quantum dynamics in complex molecules present significant computational challenges.
• Existing methods struggle to balance long-time memory effects and Markovian environments.

Purpose of the Study:

• Introduce a novel pure-state unraveled hybrid-bath method.
• Accurately describe continuous environments with discrete bosonic modes.
• Overcome limitations of prior computational approaches.

Main Methods:

• Employs a Markovian embedding to represent continuous environments with discrete bosonic degrees of freedom.
• Handles both continuous spectral densities and sharp peaks within the environment.
• Benchmarks against established problems in quantum chemistry and biology.

Main Results:

• Achieves accurate description of excitonic dynamics with fewer bosonic modes than unitary methods.
• Demonstrates a computational speed-up of nearly an order of magnitude.
• Highlights the significant impact of environmental memory effects, particularly a delta-peak, on light-harvesting complex dynamics.

Conclusions:

• The hybrid-bath method offers an efficient and accurate approach for simulating quantum dynamics.
• Provides a powerful tool for understanding photophysical processes in complex molecular systems.
• Enables advancements in quantum chemistry and biology through improved computational modeling.