Quantum Control: Scientists Manipulate Living Cells with Magnetic Fields
For the first time, researchers have demonstrated precise control over quantum biochemical reactions inside a living organism—not through drugs or genetic engineering alone, but by tuning magnetic fields to influence the quantum spins of electrons within individual proteins. A team at Stanford University has shown that radiofrequency magnetic fields tuned to the electron spin resonance frequency can alter the brightness of a red fluorescent protein called mScarlet in live nematode worms, a finding that blurs the line between quantum physics and molecular biology.
The Quantum Mechanism at the Heart of It
The work, published in Nature, centers on spin-correlated radical pairs—short-lived quantum states formed when certain molecules absorb light. These pairs consist of two radicals whose electron spins remain entangled, and they are known to be sensitive to magnetic fields.
Scientists have long theorized that this sensitivity might explain how organisms like migratory birds sense Earth's magnetic field for navigation. But deliberately engineering magnetic control over such quantum states in a living system had never been achieved.
Engineering Magnetic Control in Living Tissue
The Stanford team engineered a system using mScarlet, a bright red fluorescent protein, combined with flavin molecules that occur naturally in the worms. When illuminated, this combination generates the radical pairs.
By applying static magnetic fields alongside carefully tuned radiofrequency fields near the electron spin resonance frequency, the researchers could modulate how much light the protein emitted. The coherence time of these quantum states—how long the spin correlation persisted—exceeded 4 nanoseconds, a meaningful duration at the molecular scale.
Demonstrating Control in Living Organisms
The experiments worked both in purified protein solutions and within the transparent bodies of Caenorhabditis elegans, a millimeter-long nematode frequently used in biology research. The team used microscopy to observe fluorescence changes across individual worms, measuring the magnetic field effect directly as the radiofrequency fields perturbed the radical pair dynamics.
The team used microscopy to observe fluorescence changes across individual worms, measuring the magnetic field effect directly as the radiofrequency fields perturbed the radical pair dynamics.
If magnetic fields can influence radical pair reactions in living tissue, it may eventually become possible to use similar principles to remotely control biochemical processes—potentially even gene expression.
Why This Matters for Quantum Biology
The study also reinforces that quantum mechanical effects, long considered fragile and easily destroyed in warm, wet biological environments, can persist long enough to matter. Radical pairs appear to survive their molecular chaos, and external fields can reach them.
For a field still grappling with whether quantum biology is merely a curiosity or a functional principle in living systems, this demonstration of active control inside an organism adds substantial weight to the argument that nature exploits quantum mechanics in ways researchers are only beginning to map.
Based on: Magnetic quantum biology; Researchers at Stanford University; Nature, 2024.