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Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
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Gene Digital Circuits Based on CRISPR-Cas Systems and Anti-CRISPR Proteins
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Designs for molecular circuits that use electronic coherence.

Francesca Fassioli1, Daniel G Oblinsky, Gregory D Scholes

  • 1Lash Miller Chemical Laboratories, Institute for Optical Sciences and Centre for Quantum Information and Quantum Control, University of Toronto, 80 St. George St., Toronto, Canada.

Faraday Discussions
|September 12, 2013
PubMed
Summary

Quantum coherence in light-harvesting systems can direct energy flow in molecular circuits. However, noise significantly reduces this quantum advantage over classical energy transfer mechanisms.

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Area of Science:

  • Quantum dynamics
  • Molecular electronics
  • Biophysics

Background:

  • Recent evidence highlights long-lived coherent dynamics in light-harvesting antenna proteins.
  • This suggests potential for quantum dynamics in synthetic molecular devices via electronic energy transfer.

Purpose of the Study:

  • Explore using quantum coherence to control energy flow direction in molecular circuits.
  • Investigate a prototype circuit with three chromophores directing energy to two traps.

Main Methods:

  • Simulated a molecular circuit with controllable chromophore states (ON/OFF).
  • Analyzed energy transfer pathways and directionality.
  • Compared quantum coherence effects with classical hopping mechanisms under realistic noise conditions.

Main Results:

  • Quantum coherence enables significant control over energy transfer direction in the designed circuit.
  • In the presence of realistic noise, quantum coherence offers only a marginal improvement over classical energy transfer.

Conclusions:

  • Quantum coherence shows potential for directing energy flow in molecular systems.
  • Noise significantly impacts the practical advantage of quantum effects in energy transfer applications.