31. Standard models for describing quantum tunnelling have been shown to explain experimental enzyme data, so long as one accounts for the fact that enzymes have many possible different structures [88]. Registered charity number 207043, (Lines open Mon-Fri, 9:00-17:00. Short, innovative research from across the biological sciences. An accepted author manuscript (AAM) is the author’s manuscript version of the accepted paper.

Hence, experimental and theoretical evidence shows that single vibrational modes in a statically disordered landscape very likely assist transport in both light harvesting and charge separation in photosynthetic organisms, with the pigment excitonic transitions tuned by the protein scaffold to match the energy of the vibrational mode assisting the resonant transfer [52,56]. Here are the instructions of how to enable JavaScript in your browser. Globally, less than 20% of energy is consumed as electricity; almost all of the remaining 80% is consumed as fuel at final consumption. Depositing a preprint or AAM on a personal or institutional website or a recognised server or repository does not constitute prior publication or a breach of our media embargo policy (see below), and will prejudice neither the peer review process nor publication in our journals. There have already been significant developments surrounding the design of such systems (e.g. Understanding of the physical mechanism of the rate acceleration is a difficult topic of investigation. The emerging field of quantum biology is concerned with interactions between dynamical phenomena at well-separated length and time scales, from femtosecond energy transfer processes in molecular assemblies at the nanoscale to survival and reproduction within ecosystems at the scales of overall organisms. These results suggest that investigation of the non-classical properties of vibrational motions assisting excitation and charge transport, photoreception and chemical sensing processes could be a touchstone for revealing a role for non-trivial quantum phenomena in biology [52,67]. Moreover, their quantum behaviour is evident through their wave-like interference of different pathways and the way in which vibrational modes of the protein environment interact with the pigments (adding to the delocalization and extracting or absorbing vibrational energy) to facilitate the energy transfer in the complex. In general, the observation of oscillatory dynamics is not sufficient to rule out classical descriptions of the same behaviour, and the quantum modelling of environment-assisted transport in photosynthesis has not been without controversy.

Whereas Planck and Einstein began the quantum revolution by postulating that radiation also demonstrates particle-like behaviour, de Broglie, in 1923, made the complementary suggestion that matter itself has wave-like properties, with a wavelength related to its momentum through Planck’s constant. S.L.S. It is precisely the interplay between these time and length scales that quantum biology investigates with the aim to build a consistent physical picture.

After much theoretical evidence both for and against long-lived (up to a few picoseconds) electronic coherence, very recent 2D-ES studies on the FMO complex have shown unambiguously that these long-lived coherences originate mainly from ground state vibrations and not from exciton–exciton superpositions [47,48]. Inspired by the surprising phenomenon interpreted as long-living quantum coherence in warm, noisy, complex and yet remarkably efficient energy transfer systems, many models of environment-assisted quantum transport have been proposed. In quantum mechanics, all objects have wave-like properties, and when they interact, quantum coherence describes the correlations between the physical quantities describing such objects due to this wave-like nature. It is, however, not the intensity of the light that determines this emission but rather its frequency. Light-harvesting antennae range from quasi-disordered self-assembled aggregates [30] to highly symmetric configurations of pigments bound to protein scaffolds [31,32].

In 1996, the theory was revived through the proposal that protein-coupled receptors are measuring molecular vibrations using inelastic electron tunnelling rather than responding to molecular keys fitting molecular locks, working by shape alone [110]. Experiments performed by isolating both light-harvesting complexes and reaction centres from natural photosynthetic systems, whilst mimicking physiological environmental conditions, have shed much light on the in vivo functioning of the photosynthetic light-collecting system. The detection of the molecular precursors of life in interstellar ices suggests that the building blocks of life could possibly have emerged in space and been delivered to Earth by objects such as comets or meteorites. The dynamics described by these models are often ‘exponential’ and follow from the application of Fermi’s Golden Rule [1,2]. The nature of the four states are —a high exciton state, —an exciton state with some charge-transfer character, —a charge-transfer state mixed with an exciton state, and —the final charge-separated state.

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