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Disorder-assisted quantum transport in suboptimal decoherence regimes
Leonardo Novo1,2, Masoud Mohseni3, Yasser Omar1,4,2
1Physics of Information Group, Instituto de Telecomunicações, P-1049-001 Lisbon, Portugal.
Scientific Reports
|January 5, 2016
Summary
Dephasing noise can surprisingly enhance quantum energy transport efficiency in disordered systems. Optimal efficiency is achieved when dephasing and hopping timescales align, demonstrating a quantum Goldilocks principle.
Area of Science:
- Quantum physics
- Condensed matter physics
- Energy transport phenomena
Background:
- Quantum transport is crucial for nanoscale energy transfer.
- Disorder and environmental noise (dephasing) significantly impact transport efficiency.
- Understanding these effects is key for designing efficient quantum systems.
Purpose of the Study:
- To investigate quantum transport efficiency in binary trees and hypercubes using the disordered Frenkel-exciton Hamiltonian.
- To analyze the influence of pure dephasing noise on energy transport.
- To determine the relationship between disorder, dephasing rates, and transport efficiency.
Main Methods:
- Simulations of quantum transport under a disordered Frenkel-exciton Hamiltonian.
- Analysis of energy transport efficiency as a function of disorder and dephasing rates.
- Investigation of transport in binary tree and hypercube network structures.
Main Results:
- Dephasing was found to improve energy transport efficiency in both ordered and disordered systems.
- Maximal transport efficiency occurs when dephasing and hopping timescales are matched (quantum Goldilocks principle).
- In weak dephasing, increasing disorder initially improves efficiency up to an optimal point.
Conclusions:
- Environmental fluctuations, specifically dephasing, can be beneficial for quantum energy transport.
- Rational design of site energy distributions can optimize nanoscale transport systems.
- The findings offer new insights into controlling quantum transport via environmental engineering.
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