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Long lasting coherence in photosynthetic pigment-protein complexes has beenobserved even at physiological temperatures. Experiments have demonstratedquantum coherent behaviour in the long-time operation of the D-Wave quantumcomputer as well. Quantum coherence is the common feature between the twophenomena. An explanations for eight orders of magnitude discrepancy betweenthe single flux qubit coherence time and the long-time quantum behaviour of anarray of thousand flux qubits in the quantum computer was suggested within atheory where the flux qubits are coupled to an environment of particles calledgravonons of high density of states The coherent evolution is in highdimensional spacetime and can be understood as a solution of Schroedinger'stime-dependent equation.  Explanations for the quantum beats observed in 2D Fourier transformelectronic spectroscopy of the Fenna-Matthews-Olson (FMO) protein complex inthe green sulfur bacteria are presently sought in constructing transporttheories based on quantum master equations where 'good' molecular vibrations('coloured noise') in the chlorophyll and the surrounding protein scaffoldknock the exciton oscillations back into coherence. These 'good' vibrations areclaimed to have developed in three billion years of natural selection. Thesetheories, however, face the discomforting experimental observation that"attempts to scramble vibrational modes or to shift resonances with isotopicsubstitution miserably failed to affect the beating signals". As a possible wayout of this dilemma we adopted the formalism of the quantum computation to thequantum beats in the FMO protein complex.

How can the green sulfur bacteria use quantum computing for light harvesting?