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Quantum Biology

An icebreaker

A handful of real biological processes, an enzyme's speed, a bird's compass, a leaf's efficiency, may lean on quantum effects usually seen only in cold laboratories. Each claim carries its own separate, and very different, weight of evidence.

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Worth knowing · 1 of 5
What is enzyme tunnelling, and how solid is it?
Some enzymes appear to move hydrogen through, rather than over, an energy barrier, a quantum effect called tunnelling. Decades of careful kinetic experiments across many enzymes have made this the best-supported claim in the field.
Worth knowing · 2 of 5
How might a bird actually sense magnetic north?
Light hitting a protein in a bird's eye is thought to briefly create a linked pair of unstable particles sensitive to magnetic fields. Lab and behavioral studies increasingly support this, though the exact detection is still being pinned down.
Worth knowing · 3 of 5
What's the claim about photosynthesis, and why is it shakier?
An early experiment reported that quantum coherence helps a molecule shuttle energy efficiently after sunlight hits a leaf. Later, more careful studies found that coherence fades too fast to plausibly matter for how efficiently energy moves.
Worth knowing · 4 of 5
Where does popular science overreach these findings?
Real, narrow results in a few systems often get stretched into vague claims that quantum effects explain consciousness or general biological wonder. Researchers in the field are usually careful to keep each claim to its own narrow system.
Worth knowing · 5 of 5
Is quantum biology accepted as mainstream science?
Tunnelling and magnetoreception are increasingly accepted, published in major journals with growing experimental support. The photosynthesis claim is now genuinely contested, a reminder that these findings don't all carry equal weight.
Words to know
Quantum tunnellingA particle crossing an energy barrier it classically shouldn't have enough energy to cross.
Radical pairTwo linked, unstable particles created by a light-triggered reaction, proposed as a bird's magnetic sensor.
Quantum coherenceA wave-like link between quantum states that can carry information before it decays away.
More words
CryptochromeA light-sensitive protein in the eye, the leading candidate for where bird magnetoreception actually happens.
A voice · 1 of 4
Judith Klinman · Chemist who documented enzyme tunnelling

Through decades of kinetic studies across many enzymes, she found consistent evidence of hydrogen moving by quantum tunnelling during catalysis, showing protein motion itself helps shape the reaction.

A voice · 2 of 4
Peter Hore · Chemist who studies the bird compass

Studying a light-sensitive protein from the European robin's eye, he and colleagues found magnetically sensitive radical-pair chemistry consistent with a working compass sense, while stressing the full mechanism is still being tested.

A voice · 3 of 4
Gregory Engel · Chemist who first reported the coherence

In a 2007 experiment on a photosynthetic protein, he reported wave-like quantum coherence lasting long enough to plausibly help guide energy toward the reaction center.

A voice · 4 of 4
R. J. Dwayne Miller · Chemist who challenged that finding

Reanalyzing the same kind of photosynthetic complex with refined methods, his 2017 study found the coherence decayed far too fast to plausibly aid energy transfer, arguing nature doesn't actually rely on it.

A line to leave them with
A few real quantum effects in biology. Not yet a theory of everything alive.
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