Quantum Biology

Cross-Domain Bridges

Bridge Photosynthetic light harvesting couples near-unity quantum efficiency of primary charge separation (P680 in PSII) to Förster resonance energy transfer through antenna complexes, with disputed quantum coherence (Fleming 2007 FMO beats at 77K) operating within the Z-scheme architecture that achieves sufficient redox span to split water and reduce NADP⁺.

Fields: Chemistry, Biology, Physics, Quantum Biology, Biophysics

Photosystem II (PSII) is the only biological machine that oxidizes water: the Mn₄CaO₅ cluster (oxygen-evolving complex, OEC) accumulates four oxidizing equivalents via the Kok S-state cycle (S0→S1→S2→...

Open Unknowns (4)

Unknown Does quantum electronic coherence in photosynthetic light-harvesting complexes at physiological temperature (300K) provide any functional enhancement of energy transfer efficiency beyond what classical Förster/Redfield theory predicts, or is the ~95% quantum efficiency of primary charge separation achievable by purely classical mechanisms? u-photosynthesis-quantum-coherence-physiological-function

Unknown Does quantum coherence play a functional role in biological sensory systems (olfaction, magnetoreception, photosynthesis) beyond the classical noise floor? u-quantum-coherence-biological-sensing

Unknown Is quantum coherence (superposition, entanglement, or tunnelling) functionally relevant in biological systems at physiological temperature — in photosynthesis energy transfer, avian magnetoreception, or enzyme catalysis — and could solid-state NMR or dynamic nuclear polarisation techniques detect coherence lifetimes long enough to be biologically functional? u-quantum-coherence-biological-systems-nmr-detectable

Unknown What is the actual quantum decoherence timescale of tubulin dimer conformational superpositions in neuronal microtubules at physiological temperature (310 K), measured directly in situ, and how does it compare to Tegmark's theoretical prediction of ~10⁻¹³ s? u-quantum-decoherence-microtubule-physiological-temperature-measured

Active Hypotheses

Hypothesis Environment-assisted quantum transport (ENAQT) enhances excitation transfer efficiency in the FMO complex by 5-15% relative to the purely classical Förster limit under physiological bath conditions at 310 K. high

Hypothesis Biological sensory systems approach the Heisenberg (quantum) sensitivity limit in specific detection tasks where quantum coherence is preserved medium

Hypothesis Direct measurement of quantum decoherence timescales in neuronal microtubules at 310 K will confirm Tegmark's theoretical prediction (~10⁻¹³ s), 10 orders of magnitude shorter than neural processing timescales (~10⁻³ s), falsifying the Penrose-Hameroff Orch-OR hypothesis that microtubule quantum coherence mediates conscious experience. medium

Hypothesis Quantum coherence in warm, wet biological systems (protein complexes, DNA) decoheres on femtosecond-picosecond timescales due to phonon bath coupling and hydrogen bond fluctuations; any purported quantum effects in biology require either (a) protected decoherence-free subspaces or (b) noise-assisted transport mechanisms where coherence is irrelevant to function even if transiently present. high

Hypothesis Solid-state NMR distance restraints from PITHIRDS-CT and REDOR experiments on uniformly ¹³C,¹⁵N-labelled amyloid fibrils will reveal that all amyloid folds adopt a parallel in-register beta-sheet arrangement regardless of primary sequence, with inter-strand spacing 4.7 Å and beta-sheet stacking 10 Å, confirming the "cross-beta spine" as the universal structural motif. medium

Hypothesis Vibronic coupling — resonance between electronic energy gaps and specific protein vibrational modes in FMO and LHCII — does not enhance energy transfer efficiency beyond Redfield theory predictions at 300K; isotope-substitution experiments that detune vibrational resonances will show <5% change in charge-separation quantum yield, refuting functional quantum coherence in photosynthesis. high

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