Quantum Koan

The answer does not exist until it is observed.
A quantum computer chooses the one question you need right now.

Once a day — the encounter is born only through observation

The qubits are in superposition

What this is

Quantum Koan is a small device for drawing one Zen koan a day. It is not a fortune-telling app; there is no "lucky" or "unlucky" built into it. You receive one question, and you turn it over in your head, once, before the day ends. That is all it does.

A koan is the Zen term for a question without an answer. The most famous one asks: two hands clap and there is a sound — what is the sound of one hand? It is not a riddle to be solved. It is a question that shows you the shape of your own thinking the moment you try to think about it. The koans here are written in that form. They do not teach Buddhist doctrine and do not ask you to believe anything; the format is borrowed as an instrument for thought.

Why "quantum" randomness

The random numbers a computer normally produces are called pseudo-random. As the name says, once the seed is fixed the whole sequence is fixed. Reproducibility is a virtue in computing, but it is the opposite of what this page is about: with a pseudo-random draw, today's koan was decided at the factory.

A measurement on a quantum computer, by contrast, is — according to quantum mechanics — not determined in advance. Measure a qubit in superposition and the outcome, 0 or 1, is settled by probability; nobody, not even the machine, knows it until the measurement happens. This page selects koans using measurement bits obtained on real IBM Quantum hardware. It shares the hardware randomness pool that runs another page on this site, the Quantum Trip Solver, and takes 96 bits from it on every observation.

"The universe observes" is a metaphor for that step. The bits are already being fetched before you tap the screen, but which koan they correspond to is decided only when the bit string is complete. The difference from pseudo-randomness is simply that it cannot be reproduced. This is not a mystical claim; it can be reproduced and verified, as the next section shows.

How to use it

Press "Receive the question of this moment". The qubit fetch begins.

The screen enters superposition. Look at it for as long as you like.

Tap the screen to observe. The bit string collapses and one koan appears.

"A hint for introspection" gives one vantage point for thinking about the question, once. It is not an answer.

There is no redraw. If you open the page again on the same day, the koan you first observed is shown again. A day ends when the date changes on your own device — not UTC, not Japan time, but your "today". The one-a-day limit exists so that this does not become a fortune cookie you consume and forget. The observation log (date and koan title) keeps at most 30 entries, stored only on your device; nothing is sent to a server and nobody else can see it.

Specification, and what you can verify

This page claims that its randomness really comes from a quantum computer, so the claim should be checkable. The essentials:

Source of the bits. The portal API (/api/quantum-koan/draw) hands out 96 bits from a pool that is filled by jobs run on IBM Quantum hardware. The hardware job ID is shown on screen, so it can be matched against the job record at IBM Quantum.

How a koan is chosen. The first 7 bits are read as an integer. If the value exceeds the number of koans, those bits are discarded and the next 7 are used — rejection sampling, the standard way to avoid bias. Every koan is equally likely.

Fallback. When the hardware queue is congested and the pool cannot be reached, the page switches to the device's cryptographic randomness (crypto.getRandomValues). The screen then says "a ground-based approximation", so a hardware observation and a fallback are never confused. Since nothing irreversible depends on it and this is not divination, we consider that honest enough.

Share card. The image produced by "Share this question" has the observation time, part of the bit string, and the job ID burned in — material for checking later whether a shared koan really was that day's.

On the koans, and what comes after

The koans here were written for this site, modelled on forms that have long been known in the classical collections; none claims to be a quotation from an original text. Each comes with a hint for introspection, which is not a correct interpretation but a foothold for starting to think. In the koan tradition the answer is sought in dialogue with a teacher. There is no teacher here. Nobody anywhere knows the right answer to the question you observed. That is not a limitation of the implementation; it is the nature of the form.

It is better not to believe that quantum randomness itself carries meaning or power. What exists is one fact that was not settled until you drew it. Yet standing in front of that fact brings a quietness that fortune-telling does not: not knowing what will come is a reason to take seriously what did. The one-a-day design is there to protect that quietness.