Since the dawn of time, human beings have asked the same haunting question:
Is this world real, or merely an illusion?
Is there a creator behind the curtain, or does the universe move of its own accord, arising and dissolving like a breath in the dark?

Now, in an age of quantum computers and simulation theories, that ancient question has returned — but it speaks a new language: the language of bits and qubits, computation and probability.

In quantum mechanics, a particle can exist in multiple states at once — a phenomenon called superposition — until a measurement occurs, and reality crystallizes into something definite.
As physicist John Wheeler famously said, “It from bit.”
All that exists, he suggested, arises from information.
The universe, then, is not a mechanical clock in the Newtonian sense, but a vast probabilistic computation unfolding through itself.

Physicist Seth Lloyd once described it beautifully: “The universe computes its own evolution.”
And through that lens, one begins to imagine a strange possibility — that everything, from electrons to galaxies, from breath to thought, might simply be streams of data flowing through an infinite quantum engine.

If human beings can build a quantum computer powerful enough to simulate a miniature universe, could our own universe be a simulation within a larger one?
That was the provocative idea proposed by philosopher Nick Bostrom at Oxford:
If a sufficiently advanced civilization can create countless simulated worlds, then statistically, it is far more likely that we are living in one of them than in the original “base reality.”

This idea cannot be proven, of course. It is more mirror than theory — a reflection of our longing to understand who, or what, might be running the code of existence.
And yet, the metaphor of the simulated universe, while dazzling, also hides a blind spot.
For even the most sophisticated computer remains a human artifact, bound by the laws of the very universe it seeks to mimic. Every simulation still presupposes a substrate — a realm “beyond.”
And in reducing reality to information alone, we risk losing sight of the one thing that cannot be simulated: consciousness itself — the lived pulse of awareness, of joy and sorrow, of being alive.

This, perhaps, is where Buddhist philosophy offers a deeper view.
More than two millennia ago, the Buddha declared: “All things arise in dependence, and in dependence they cease.”

Nothing exists by itself. Everything depends on everything else.
A flower cannot bloom without the soil, the rain, the sunlight — and even the one who beholds it.
The universe, too, is not a solid machine but an ever-moving web of relationships, a vast net of dependent origination.

In modern language, we might say that emptiness (śūnyatā) — the Buddhist insight that all phenomena are empty of inherent existence — resembles superposition in quantum physics: a field of pure potential, undefined until interaction gives it form.
And dependent origination (pratītyasamutpāda) mirrors quantum entanglement: nothing exists in isolation; all things arise together.

But Buddhism goes beyond the observer effect of physics.
It does not claim that reality appears only when someone observes it — rather, that observer and observed are never two.
There is no independent “out there.” The act of seeing and what is seen are co-arising.
The dream and the dreamer are one.

Beyond that, Buddhism speaks of karma — the subtle engine of reality.
Karma is not punishment, but a law of feedback: every thought, every action, leaves an imprint, and the totality of those imprints shapes the world we inhabit.
If the universe were a program, karma would be the background engine constantly recompiling reality according to the data our minds send it.
A wholesome thought, a kind gesture, a moment of clarity — each is a new line of code altering the system.
The outer world and the inner world mirror each other, not because someone else designed them, but because we are writing them, moment by moment.

In this sense, both quantum physics and Buddhist thought arrive at a similar insight:
There is no rigid, absolute reality.
Quantum physics reveals a world that exists only through interaction; Buddhism teaches that nothing has a fixed essence, that all is dependent on causes and conditions.
Both recognize the invisible web connecting all things — and both acknowledge the role of consciousness in making the world appear.

But at the final turn, they diverge.
Science looks outward, searching for the server that runs the universe.
Buddhism turns inward, realizing that the server is the mind itself.
Science seeks the mechanism; Buddhism seeks the meaning.
One aims to understand the universe; the other, to understand the one who is looking.

And perhaps that is why the question “Is the universe a simulation?” ultimately fades away.
Whether real or simulated, suffering is still real.
And the only way to transcend it is to transform the mind.

If the universe is a program, then every thought, every breath, every act is a line of code shaping the simulation.
When we plant seeds of compassion, wisdom, and truth, the code itself changes — not because someone reprogrammed it, but because the character inside the program learned to rewrite their own source.

Science looks outward for the architecture of the cosmos.
Buddhism looks inward, to the mind — the source from which both programmer and program arise.
And perhaps, to become a true creator, one does not need a supercomputer,
but a clear mind — quiet enough to observe, wise enough to rewrite its own code in the language of compassion.

And when that happens, the question “Is the universe simulated?” becomes weightless, like a breeze.
For when one truly sees, there is no real or illusion — only reality writing itself, through the rhythm of the awakened mind.

This essay was originally written in Vietnamese as “Vũ Trụ Lượng Tử, Giả Lập, và Phật Pháp.”