Quantum Fourier Transform is unitary
Theorem.Quantum Fourier Transform is unitary — Q[j][k] = ω^{jk}/√N (ω = e^{2πi/N}) satisfies Q†Q = I for N = 2,4,8,16 exactly.
Proof.Q[j][k] = ω^{jk}/√N (ω = e^{2πi/N}) satisfies Q†Q = I for N = 2,4,8,16 exactly — the reversible transform at the heart of Shor’s factoring algorithm.
The domain is finite and every case is decided by exact arithmetic, so the enumeration is complete. ∎
src/9/1/index.ts#discoveredTheoremsWaveFortyFive
1 · Classification
finite-complete — self-contained computation, no external lean
2 · Provenance
Documented theorem re-derived by exhaustive computation (humanityNovel=false); first-in-this-registry is the only sense of discovered.
Acknowledgment
"Quantum Fourier Transform is unitary" is a re-derivation, acknowledged to documented mathematics — the original proof is the prior art this re-derivation acknowledges; not new to humanity — the contribution is the reproducible computation discoveredTheoremsWaveFortyFive.
- Prior art
- documented mathematics — the original proof is the prior art this re-derivation acknowledges
- Novelty
- not new to humanity — a re-derivation (humanityNovel = false)
- Contribution
- a reproducible computation (discoveredTheoremsWaveFortyFive @ src/9/1) that re-derives the result at zero tokens — the contribution is the verifiable recomputation, NOT the theorem
3 · Reproducibility
Recompute from source: npm run theorems:verify recomputes discoveredTheoremsWaveFortyFive (src/9/1/index.ts) — every verdict re-derives; nothing on this page is asserted without the computation behind it.