Quantum Biology

Quantum biology — the field studying quantum mechanical phenomena in biological systems — has revealed that some of life's most fundamental processes exploit quantum effects (superposition, entanglement, tunneling) that were once thought to be exclusive to physics laboratory conditions. The insight is remarkable: living cells, at warm temperatures and in the 'wet and noisy' biochemical environment that should rapidly destroy quantum coherence, apparently maintain and exploit quantum effects for essential biological functions. Documented quantum biological effects: photosynthesis (quantum coherence in the FMO complex of green sulfur bacteria allows energy to simultaneously explore multiple pathways and find the most efficient route — contributing to photosynthesis's near-100% quantum efficiency); enzyme catalysis (proton tunneling through energy barriers in enzyme reactions — hydrogen atoms literally teleport between molecules rather than going over the energy barrier); bird magnetic navigation (cryptochrome proteins in bird eyes use quantum entanglement between electron pairs to detect the angle of Earth's magnetic field, confirmed experimentally in 2021); olfaction (quantum tunneling may explain how we distinguish molecules with identical shapes but different atomic compositions — the 'quantum nose' hypothesis); and DNA mutation (quantum tunneling of protons between base pairs may cause some mutations, though this remains controversial).