Quantum physics describes the behavior of matter at the scale of the infinitely small. Consciousness refers to our subjective experience of the world. Bringing these two concepts together in the same sentence provokes as much fascination as skepticism among scientists.
Microtubules and the brain: why the debate has changed in nature
For a long time, one argument seemed to close the discussion: the brain is too warm, too humid, and too agitated for quantum states to survive there. Quantum phenomena, such as superposition or entanglement, generally require temperatures close to absolute zero and extreme isolation.
Recent work has weakened this certainty. Researchers like Bandyopadhyay and his colleagues have observed microtubule resonances extending across multiple neurons, capable of modulating membrane tension. These resonances diminish under the influence of anesthetics, which is intriguing: the loss of consciousness coincides with the disruption of these phenomena.
Microtubules are tiny protein tubes present in every cell. Imagine them as the internal skeleton of a neuron. According to the Orch-OR theory proposed by physicist Roger Penrose and anesthetist Stuart Hameroff, these structures would be the seat of quantum processes related to consciousness.
Experiments have documented super-radiance and quantum coherence phenomena in these biological structures at room temperature. This does not prove that consciousness arises from quantum physics, but the debate has shifted from “highly improbable” to “disputed but empirically engaged.” To delve deeper into the link between quantum and consciousness, several recent syntheses document this evolution.
Quantum-consciousness causal chain: the missing link
You may have noticed that in science, observing a phenomenon is not enough to prove that it causes something? This is exactly the problem here.
Even if quantum effects exist in the brain, no one has demonstrated the complete chain. To validate the hypothesis, three successive steps would need to be proven:
- A measurable non-classical quantum state occurs in neural structures (there are clues, such as microtubule resonances)
- This quantum state modifies neuronal computation in a verifiable way, meaning it concretely changes how neurons process information
- This neuronal modification produces or alters conscious experience in a way that classical neurobiology cannot explain
A 2026 synthesis on “quantum consciousness engineering” highlights that no study has completed this full causal chain. Current work focuses on the first step. The next two remain open.
It’s a bit like finding a rare ingredient in a kitchen: its presence does not prove that it was used to prepare the dish.
Quantum theory of consciousness and quantum computer: two distinct subjects
A common confusion arises: if we build increasingly powerful quantum computers, will they not eventually become conscious? The idea seems logical on the surface. It is based on reasoning that does not hold.
Increasing computational power does not generate consciousness. A quantum computer manipulates qubits to solve certain mathematical problems faster than a classical computer. It has no subjective experience, no feelings.
To understand the difference, philosophers distinguish two types of consciousness. Access consciousness refers to the ability to process information and report on it. Your phone already does this. Phenomenal consciousness refers to the lived experience: seeing red, feeling pain, experiencing joy.
The human brain, with its modest energy consumption, produces a rich phenomenal consciousness. Classical or quantum supercomputers, despite considerable resources, produce no identifiable trace of it. The problem is not power; it is the very nature of the phenomenon.
Quantum physics and mind: distinguishing science from speculation
The word “quantum” fascinates. It is also frequently misappropriated. Personal development trends use terms like “quantum energy” or “quantum healing” with no relation to physics.
Real research on the subject is rigorous and cautious. It poses hypotheses, designs experiments, publishes verifiable results. Here is what separates the scientific approach from speculation:
- Science tests precise predictions (for example, microtubule resonances must disappear under anesthesia, which has been observed)
- Speculation applies quantum metaphors (superposition, entanglement) to psychological phenomena without demonstrated mechanisms
- Science acknowledges its limits: the Orch-OR theory remains a hypothesis, not an established fact
A simple criterion allows for sorting: if a claim about “quantum and consciousness” does not cite a specific physical mechanism or experimental result, it is likely speculation.
What current research is really seeking
Teams working on this subject are not trying to prove that “everything is quantum.” They are attempting to determine if specific quantum processes play a functional role in the brain. The nuance is fundamental.
The next steps will focus on the ability to directly measure quantum states in living neurons and to determine if these states influence neuronal information processing. These experiments are technically very challenging, which explains the slow progress.
The question of the link between quantum physics and consciousness remains open. It is neither settled in favor of the myth nor validated as a scientific reality. Recent data make the hypothesis testable, which now distinguishes it from pure speculation. This may be the most significant change in recent years in this field of research.
