Scientists Found A Strange Signal Hidden Inside Living Cells

Something inside living cells appears to be producing a signal that researchers cannot easily explain with ordinary chemistry. A team in Shanghai detected an unusual oscillation at 71 terahertz in living human cells, mouse tissues and intact mitochondria, then found that the signal disappeared when the cellular structure was destroyed.

The finding has reopened a question that scientists have debated for years: could quantum effects play a functional role inside living biology? The researchers have proposed one possible explanation, but their work is still a preprint and several major questions remain unanswered.

A Mysterious 71 Trillion Cycles Per Second

Researchers Yu Yang, Zhenglong Gu and Bo Song from the University of Shanghai for Science and Technology used infrared spectroscopy to examine living biological samples. They studied human cells alongside fresh mouse kidney, liver, heart and skeletal muscle, as well as mitochondria whose internal structures remained intact.

Across those samples, the researchers repeatedly detected an unusual signal around 71 terahertz. One terahertz represents one trillion oscillations per second, so 71 terahertz corresponds to 71 trillion cycles every second.

The unusual part was not simply the frequency. According to the researchers’ preprint, the oscillation appeared only in living cells and tissues, was strongly dependent on intact mitochondrial structure and could not be assigned to a specific molecule.

The Signal Disappeared When The Structure Was Destroyed

The researchers then changed the physical condition of their samples by drying and grinding tissue before testing it again. The 71 THz signal disappeared, making this one of the most important observations in their experiment.

Molecules normally have identifiable vibrational signatures tied to their chemical bonds. The researchers instead found that the mysterious signal appeared to depend on the larger biological structure remaining intact, which led them to investigate whether mitochondrial architecture could be responsible.

Mitochondria contain highly folded internal membranes called cristae. These folds increase the available membrane surface and play an important role in the processes that produce ATP, the molecule cells use as an energy source.

The Quantum Explanation Involves A Frequency Split

The team’s proposed explanation begins with carbon-hydrogen bonds. According to their model, these bonds naturally vibrate at around 87 terahertz, while light trapped within the folded mitochondrial structures could interact strongly with those vibrations.

When light and matter become strongly coupled, they can form a hybrid excitation known as a polariton. The researchers propose that this interaction could split the original 87 THz frequency into two energy levels.

Their calculations place those levels around 71 and 103 terahertz. The researchers argue that the 103 THz component would be difficult to distinguish because it falls within a crowded spectral region, while the 71 THz component would be easier to identify.

That model offers a possible explanation for the mysterious signal. It does not yet prove that the signal is a quantum state.

The Researchers Then Tested The Cells With Infrared Light

Finding an unexplained signal was only the first step. The researchers then exposed cultured human cells to weak infrared light tuned to frequencies predicted by their model and measured ATP production.

At 71 THz, ATP production increased by 10.3%. At 87 THz, production increased by 10.1%. Researchers also tested 53.7 THz as a control frequency that was not predicted by their model, and they reported no significant change.

The pattern led the researchers to propose that the suspected state could somehow influence mitochondrial energy production. Bo Song told ScienceAlert that the state “might increase the efficiency of TCA cycles, influencing the ATP production.”

That wording is important because the experiment established an association, not a complete mechanism. More work would be needed to show exactly how the proposed state could affect the biochemical machinery responsible for ATP production.

What Makes A Polariton Relevant Here?

A polariton forms when light interacts strongly with matter, creating a hybrid state that cannot be described simply as light or as a material vibration. The concept is well established in physics, although the researchers’ proposed role for such a state inside living mitochondria remains unconfirmed.

Their hypothesis depends heavily on the structure of the mitochondrion. The folded membranes could potentially create conditions that allow light and molecular vibrations to interact in an unusual way.

That would also fit the observation that the 71 THz signal disappeared when the biological structure was destroyed. However, demonstrating that a polariton-like state exists inside living cells requires considerably more evidence than finding a frequency that fits a theoretical prediction.

The Experiment Has Some Serious Limits

The most important details of the study are arguably the ones that make the headline less definitive. The ATP experiment used a single cultured cell line called HEK-293T, with eight samples tested under each condition.

A laboratory cell line is not equivalent to tissue functioning inside a living animal. Nobody involved in the research has demonstrated that the infrared exposure produces the same effect inside an intact animal, much less inside a human being.

The research has also been released as a bioRxiv preprint, meaning it has not yet gone through peer review. The proposed quantum state has not been fully characterized either, leaving several important pieces of the explanation unresolved.

Those limitations do not eliminate the observation. They mean the result needs independent testing before scientists can establish exactly what the signal represents.

There Could Be A Much More Ordinary Explanation

Quantum biology has long faced a difficult problem. Living cells are warm, wet and chemically active environments, making them challenging places to identify delicate quantum states.

There is also a conventional explanation that researchers have not fully ruled out. Infrared light can heat biological samples, while electromagnetic resonances or reflections inside cellular membranes could potentially create effects at particular frequencies.

A technical discussion of the work has also pointed out that the researchers did not use a physical temperature probe on the samples. That leaves open the possibility that ordinary physical effects could account for at least some of what was observed.

Matching a measured frequency to a theoretical prediction is therefore not enough to establish that the predicted quantum state exists. Independent laboratories would need to reproduce the finding while carefully ruling out those alternatives.

This Does Not Mean You Should Buy A Light Therapy Panel

The 71 THz finding is likely to attract attention from people interested in infrared and red-light treatments, but the study does not justify that leap. A frequency of 71 THz corresponds to a wavelength of roughly 4.2 micrometers, placing it in the mid-infrared range.

That is very different from the 660 and 850 nanometer wavelengths commonly used in consumer red-light panels. The researchers also did not establish a medical treatment or show that exposing a person’s body to a particular light source would reproduce the cellular effect.

For now, the finding belongs to experimental biology rather than consumer health advice. Nothing in this preprint changes what people should do with established medical treatments.

One Independent Replication Could Change The Conversation

Quantum biology has spent years exploring whether unusual physical effects might play useful roles inside living systems. The field has also faced disappointment because intriguing possibilities have often proved difficult to demonstrate conclusively.

Richard Cogdell, a photosynthesis researcher at the University of Glasgow, described that history to Quanta Magazine. “It would be exciting if there really was something to this,” Cogdell said, “and there was something special about biology that no one had realized before.”

That is essentially the question raised by the Shanghai research. If another laboratory independently detects the same 71 THz signal in intact mitochondria, the result would deserve much closer attention.

The researchers would then need to establish whether the signal genuinely represents the proposed quantum state and whether that state actually affects mitochondrial energy production. Until those experiments happen, the 71 THz signal remains an intriguing observation rather than proof that cells are running on quantum machinery.

For now, the most defensible claim is also the most interesting one: researchers have found a recurring signal inside living biological structures that they cannot confidently identify, and they have proposed a quantum explanation that still needs to survive independent testing.