Why Quantum Theory and Physical Reality Never Matched — A Stability-Based Bridge

Matteo Bellori • March 20, 2026

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For over a century, quantum mechanics has been one of the most successful theories in science. It predicts experimental outcomes with astonishing precision and has reshaped our understanding of the physical world.

And yet, something fundamental has always felt unresolved.


Quantum theory describes the world as a space of possibilities — a superposition of many potential configurations. But the world we actually experience is not a cloud of possibilities. It is stable, concrete, and consistent.


We don’t experience “maybe.”
We experience this specific reality.


The uncomfortable truth is that these two pictures — quantum possibility and experienced reality — have never fully aligned.


The Persistent Gap Between Theory and Reality

At the quantum level, systems are not in a single definite state. Instead, they exist in combinations of possible states, each with a certain probability. This is not a philosophical interpretation; it is built directly into the mathematics of quantum mechanics.


But this raises a simple and unavoidable question:

If reality starts as a set of possibilities, why do we only ever observe one stable outcome?

Over time, several approaches have tried to answer this:

  • Collapse theories suggest that the wavefunction randomly selects a single outcome
  • Many-worlds interpretations argue that all possibilities exist, but in separate branches
  • Decoherence explains how interactions suppress interference between possibilities


Each of these explains part of the story. But none of them fully answer a deeper question:

Why do certain configurations persist as reality, while others do not?

In other words, what determines whether something can exist as a stable part of the world?


A Shift in Perspective: From “What Exists” to “What Persists”

In my recent work, I approached this problem from a different angle.


Instead of asking which state becomes real, I asked what must be true for anything to remain real under interaction.

This may sound like a small shift, but it changes the entire framing of the problem. Reality is not just about what is possible. It is about what can persist. And persistence is not guaranteed.


The Core Proposal: Stability as the Missing Link

The central idea is this:

A configuration can only be part of physical reality if it produces consistent outcomes under interaction.

This introduces a simple but powerful constraint.

If a configuration leads to inconsistent results when interacting with other systems, it cannot be reliably identified. And if it cannot be identified, it cannot function as part of shared reality. This means that not all quantum possibilities are equal. Some configurations are compatible with stable interaction. Others are not.

And that difference determines what becomes real.


Why This Matters for Quantum Theory

Quantum mechanics already defines a space of possible configurations. What it does not explicitly define is a selection principle that explains why only certain configurations persist.


This is where stability comes in.


Stability is not an added force or a modification of the equations. It is a structural condition:

Only configurations that maintain consistent relational outcomes across interactions can persist.

When this condition is applied, the gap between quantum possibility and experienced reality begins to close.

Reality is no longer something that needs to be randomly selected or split into branches. Instead, it is what remains coherent under interaction.


Rethinking Decoherence

Decoherence is often presented as the mechanism that explains the emergence of classical reality. It shows how interactions with the environment suppress interference between different quantum states.


But from the perspective of stability, something deeper is happening.


The environment is not just suppressing interference. It is enforcing consistency.


Configurations that would lead to incompatible or contradictory interaction outcomes cannot be maintained. They effectively eliminate themselves, not because they are forbidden, but because they cannot remain coherent under interaction.


This reframes decoherence:

It is not just the loss of interference, but the filtering of configurations based on their ability to remain structurally consistent.

The Bridge Between Quantum Possibility and Reality

With this perspective, we can finally describe the missing bridge:

  1. Quantum mechanics defines what is possible
  2. Interaction imposes relational constraints
  3. Stability determines which configurations can persist


The result is the world we observe:

A reality composed only of configurations that remain coherent under interaction.

This is not an additional layer on top of physics. It is a structural clarification of how existing physics leads to a stable world.


Two Levels of Stability

An important consequence of this approach is that stability operates at more than one level.


At the most basic level, stability determines whether a configuration can exist at all. This is the level at which physical reality emerges.


At a higher level, stability applies across sequences of change. This determines whether something remains recognisable over time — what we would call identity.


This distinction matters because it connects physics to broader domains. The same principle that explains why physical states persist also explains how systems, organisms, and even individuals maintain continuity while changing.


From Time to Change

This also leads to a subtle but important shift in how we think about time.


In many explanations, time is treated as the backdrop against which everything unfolds. But in this framework, time is not what drives change.


Instead, change is primary.


What matters is not that something exists “over time,” but that it remains coherent across transformations. Time becomes a way of describing sequences, not the cause of them.


What This Means More Broadly

If stability determines what persists, then reality is not just a collection of objects, but a structure of relationships that remain consistent under interaction.


This has implications beyond physics.


It suggests that:

  • systems exist because they maintain coherence
  • identity emerges from stable sequences of change
  • meaning arises from the expansion of these stable structures


In that sense, the bridge from quantum mechanics to reality is also a bridge from physics to experience.


A Structural Answer to an Old Problem

The mismatch between quantum theory and reality has never been about incorrect mathematics. It has been about a missing structural explanation.


By introducing stability as a necessary condition for persistence, we gain a way to understand why reality appears stable, consistent, and shared — even though its underlying description is probabilistic.


This does not replace quantum mechanics.

But it does explain something it leaves open:

Why anything becomes real in the first place.


Read the Full Paper

For the full argument and formal development:

👉 https://doi.org/10.5281/zenodo.19136715


Explore the Full Framework

This idea is part of a broader theory connecting quantum possibility, stability, identity and meaning:

👉 https://www.matteobellori.com/framework


Final Thought

Quantum theory tells us what could happen.


But reality is not defined by what could happen.

It is defined by what can remain consistent when everything interacts.

And that, perhaps, is why anything exists at all.

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