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A linear chain of connected electron sites with two asymmetric sinks, oneattached to each end, is used as a simple model of quantum electron transfer inphotosynthetic bio-complexes. For a symmetric initial population in the middleof the chain, it is expected that electron transfer is mainly directed towardsthe strongest coupled sink. However, we show that quantum effects radicallychange this intuitive "classical" mechanism, so that electron transfer canoccur through the weaker coupled sink with maximal efficiency. Using thiscapability, we show how to design a quantum switch that can transfer anelectron to the left or right branch of the chain, by changing the coupling tothe sinks. The operational principles of this quantum device can be understoodin terms of superradiance transitions and subradiant states. This switching,being a pure quantum effect, can be used as a witness of wave--like behaviourof excitations in molecular chains. When realistic data are used for thephotosystem II reaction center, this quantum biological switch is shown toretain its reliability, even at room temperature.

A Quantum Biological Switch Based on Superradiance Transitions