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Quantum dynamics of incoherently driven V-type systems: Analytic solutions beyond the secular approximation
Amro Dodin1, Timur V Tscherbul1, Paul Brumer1
1Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada.
The Journal of Chemical Physics
|July 3, 2016
Summary
This study reveals how noise-induced Fano coherences in V-type quantum systems, crucial for light harvesting, are controlled by damping parameters. These coherences, especially in the overdamped limit, can be long-lived and enhance decay rates.
Area of Science:
- Quantum dynamics
- Quantum optics
- Spectroscopy
Background:
- Light harvesting processes rely on efficient energy transfer in complex molecular systems.
- Quantum coherence plays a vital role in the dynamics of these systems.
- Understanding V-type systems and their interaction with thermal baths is key to optimizing energy transfer.
Purpose of the Study:
- To derive closed-form analytic solutions for non-secular Bloch-Redfield master equations in V-type systems.
- To investigate noise-induced Fano coherences generated by incoherent driving.
- To analyze the influence of damping parameters on coherence dynamics and their relevance to light harvesting.
Main Methods:
- Solving non-secular Bloch-Redfield master equations for a V-type system.
- Analyzing the time evolution of coherences under sudden incoherent driving.
- Investigating the role of the damping parameter ζ and other system parameters.
Main Results:
- Closed-form solutions for quantum dynamics of V-type systems were obtained.
- Noise-induced Fano coherences were identified and characterized.
- Coherence dynamics were shown to depend on the damping parameter ζ, exhibiting oscillatory, steady-state, or intermediate behavior.
- A long-lived coherent superposition was found to enhance decay rates in the overdamped limit.
- Asymptotic coherences were observed in asymmetric V-systems.
Conclusions:
- Analytic solutions provide deep insights into quantum dynamics of V-type systems.
- Noise-induced Fano coherences are controllable and can be optimized for enhanced decay.
- The findings are relevant for designing efficient light-harvesting systems and understanding quantum phenomena in noisy environments.
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