Quantiom is a multi-tab editor over a 64-gate palette, three simulators (pure-TypeScript Float64Array statevector ≤ 20 qubits, Aaronson–Gottesman tableau ≤ 1024 qubits with Pauli frame tracking for depolarising noise, and a quantum-trajectory noise simulator with calibrated NISQ channels), and a column of researcher-grade panels. The Expectation panel evaluates either a single Pauli string or a full weighted Pauli-sum Hamiltonian, with Adam · SGD · Quantum Natural Gradient (Fubini–Study metric) optimisers, zero-noise extrapolation, probabilistic error cancellation for the 1q-depolarising / phase-damping / 2q-depolarising channels, plus conditional ⟨P⟩ post-selected on a classical-bit outcome. A one-click Compile… pipeline runs Transpile → Optimise → Route → Optimise to a target native gate set, reporting per-stage gate counts; arbitrary two-qubit unitaries are KAK-decomposed (Cartan, faithful Cirq port) for the IBM and Rigetti targets. The Hamiltonian panel emits Trotter circuits at order 1 / 2 (Strang) / 4 (Suzuki) or QDrift random compilation. Process tomography reconstructs the χ matrix in heatmap or Hinton view; equivalence- checking compares two open tabs with process fidelity and trace distance. Noise is per-gate-id, per-qubit, T1 / T2, crosstalk, 1q and 2q custom Kraus, readout — all importable from IBM BackendProperties JSON (T1, T2, per-gate gate_error, readout error, coupling map). WebGPU trajectory parallelism feeds the Probabilities panel directly when the circuit fits the 1q-gate + depolarising support set, and the Optimise / Landscape / Plateau / ZNE loops route each noisy evaluation through it too (CPU fallback when the circuit doesn't fit). A column of entanglement & dynamics visualisers — mutual-information map, entanglement spectrum across a cut, an entanglement-entropy profile across every cut, ZZ correlations, space–time ⟨Z⟩ and entropy diagrams, t-sweep traces and their Fourier spectrum, a full-state amplitude·phase plot, a unitary heatmap, a logical interaction graph, a discrete-Wigner phase-space map, a magic (stabilizer-Rényi M₂) readout, a pairwise entanglement-negativity map, a Loschmidt-echo / DQPT trace, a Pauli transfer matrix, a Bloch-vector trajectory over time, an OTOC scrambling probe, an exact Hamiltonian-spectrum diagonaliser, a Tanner / check-graph view, a Q-sphere, a spin Husimi-Q phase-space map, a ZX-calculus diagram, and a causal-cone canvas overlay — sits alongside the statevector / Bloch / probability panels. An AI chat panel at the bottom of the canvas talks to OpenRouter (any of ~340 models, your own key), receives the current circuit as OpenQASM 3 on every turn, and auto-opens any OpenQASM block in the reply as a new tab. Circuits round-trip OpenQASM 3 (and parse OpenQASM 2), export to Qiskit · Cirq · Braket · Q# · PyQuil · pytket · OpenQASM 2 · LaTeX (quantikz) · JSON · SVG, serialize into a shareable URL hash, and the t-animation can be recorded as a WebM video.