Qubit Quest

Learn quantum computing from zero, level by level, in the old-school pixel look of BlackBreak: red pixel frame, segmented bars, a gold and white 5x7 pixel font, Doom-blue menus, no smoothing.

63 levels in 9 worlds, all in English, from bits to real hardware:

World Levels 1. Classical warm-up bits, binary numbers, logic gates, reversible computing 2. Math toolkit probability, vectors, matrices, complex numbers, phase and Euler, inner products, tensor products, unitary matrices 3. One qubit the qubit, measurement, X, superposition (H), interference, phase (Z S T), the Bloch sphere, bases and rotations 4. Many qubits two qubits, CNOT, entanglement, the four Bell states, SWAP, no cloning, Toffoli and universality, the Bell (CHSH) test 5. Quantum protocols superdense coding, teleportation, BB84 key distribution 6. Algorithms phase kickback, Deutsch, Deutsch-Jozsa, Bernstein-Vazirani, Simon, Grover, the quantum Fourier transform, phase estimation, Shor 7. Quantum hardware DiVincenzo's checklist, superconducting qubits, the qubit chip (silicon or sapphire, Al/AlOx/Al junctions, tantalum), the dilution refrigerator part by part (vacuum can, shields, pulse tube, gold-plated copper plates), helium dilution (6.6% helium-3, still, sintered-silver heat exchangers), wires, filters and shields (stainless and NbTi coax, attenuators, circulators, TWPA, HEMT, infrared), control and readout (DRAG pulses, dispersive readout), spins in silicon (silicon-28, spin-to-charge readout) 8. Lasers and optics how a laser works (stimulated emission, population inversion, the resonator, coherence length), polarization qubits (wave plates as gates, Jones matrices, polarizing beam splitters), optics and photons (Mach-Zehnder, down-conversion, nanowire detectors, photonic chips), laser cooling (Doppler cooling, the Doppler and recoil limits, sub-Doppler cooling), trapped ions (Yb-171 at 369.5 nm, Paul traps, Mølmer-Sørensen gates, QCCD), neutral atoms (MOT, tweezers, AOD rearrangement, Rydberg gates) 9. Real quantum computers noise, error correction, variational algorithms, Qiskit in practice, what next Every level has lessons, quizzes and circuit puzzles (1 to 3 qubits, black-box oracles, fixed gates, partial goals), and on every step four buttons:

ELI5: the idea explained like you are five. CODE: a runnable Python / Qiskit (or NumPy) example for the level, with a COPY button. MORE: the details behind the level: derivations, exact formulas, numbers, what things are made of and why. SOURCES: the papers and books behind it. Every source was checked against a bibliographic record; see docs/REFERENCES.md. The title screen also has a GATE BOOK (every gate, its matrix and Qiskit call), a GLOSSARY and the full source list. In puzzles the state shows a probability bar, the size and a phase dial per amplitude; tap it for the exact complex numbers.

License MIT. The sources cited in the game belong to their authors; the game cites them, it does not copy them.