Library
Choose lessons or deeper experiments first.
LessonLessonsAnimated cards, quick checks, and XP
FoundationsLessons
The Strange Quantum WorldThere's another world below atomsSuperpositionThe particle is everywhere at onceThe Wave Functionψ(x,t) — the math of possibilityMeasurementLooking is what makes things realThe Double SlitOne particle going through two slitsWave-Particle DualityLight is both — and so are youUncertaintySome things can't be known at the same timeQuantum TunnelingParticles walk through wallsThe Schrödinger EquationThe equation that runs the universeStationary StatesStanding waves in a quantum worldThe Particle in a BoxWhat happens when you trap a waveHydrogenHow an electron orbits without orbiting
Atomic & Molecular PhysicsLessons
SpinParticles spin without spinningThe Stern-Gerlach ExperimentThe experiment that found spinPauli ExclusionWhy every atom has a shapeMulti-Electron AtomsWhen electrons have to share a houseMolecular OrbitalsTwo atoms, one shared cloudChemical BondingWhy atoms stick togetherSpectroscopyHow light tells you what something isLasersCoherent light, plain and simple
Quantum InformationLessons
Bits and QubitsBeyond zero and oneThe Bloch SphereEvery quantum state is a point on a sphereSingle-Qubit GatesRotations of the Bloch sphereThe CNOT GateWhen two qubits become oneEntanglementTwo particles, one shared destinyBell StatesEinstein was wrong about this oneQuantum TeleportationQuantum information at any distanceThe No-Cloning TheoremYou can't copy a quantum statePOVMsMeasurement isn't always yes-or-noDensity MatricesQuantum states with imperfect information
Quantum ComputingLessons
Quantum CircuitsReading the circuit diagramUniversal Quantum GatesAll quantum logic from a small setDeutsch-JozsaThe first quantum advantageGrover SearchSearching faster than possibleQuantum Fourier TransformThe quantum Fourier transformShor's AlgorithmHow quantum computers break encryptionVariational Quantum EigensolverSolving chemistry with quantum hardwareQAOAApproximating impossible optimizationsQuantum Machine LearningWhen neural networks meet qubitsNISQ ComputingWhat today's quantum computers can doFault ToleranceBuilding reliability from unreliabilitySurface CodesThe error-correcting code that might win
Quantum HardwareLessons
Superconducting QubitsQubits made of supercooled metalTrapped IonsQubits made of single floating atomsPhotonic QubitsQubits made of lightTopological QubitsThe qubit that's intrinsically protectedNeutral AtomsQubits made of atoms held by lasersSpin QubitsQubits inside silicon — the same stuff as your computerDecoherenceWhy quantum computers have to be coldCryogenicsHow to make something colder than space
Quantum SensingLessons
Quantum SensingMeasuring the universe more precisely than physics should allowAtomic ClocksThe most accurate clocks in existenceNV CentersA defect in diamond that can sense a single electronQuantum Gravity SensingDetecting the pull of a single grain of riceLIGOHow LIGO detected colliding black holesQuantum ImagingPhotographing things with light that never touched them
Quantum CryptographyLessons
The Classical Cryptography ProblemQuantum computers will break the internetBB84BB84 — the original quantum-secure key exchangeE91Bell-state cryptographyPost-Quantum CryptographyPost-quantum cryptography — fighting fire with fireQuantum Random Number GenerationTrue randomness from a quantum coin flipThe Quantum InternetWhat a real quantum internet would look like
QFT & BeyondLessons
Foundations & PhilosophyLessons
Quantum ChemistryLessons
Electronic StructureElectrons draw the boundaries of chemistryPotential-Energy SurfacesMolecules move across invisible landscapesReaction TunnelingA reaction can cross a barrier without climbing itMolecular VibrationsMolecules ring with quantum notesSelection RulesLight only opens certain molecular doorsConical IntersectionsExcited molecules find hidden emergency exitsNonadiabatic DynamicsElectrons and nuclei stop taking turnsCharge TransferAn electron moves before the molecule catches upQuantum SolvationThe liquid around a molecule changes the quantum storySpin ChemistrySpin can decide which product formsPhotochemistryLight reshapes a reaction before heat canQuantum Simulation for ChemistryMolecules are quantum computers' native language
Quantum BiologyLessons
Photosynthetic Energy TransferLiving antennas guide packets of sunlightEnzyme TunnelingEnzymes make room for quantum shortcutsRadical-Pair MagnetoreceptionA chemical reaction can become a compassVision PhotochemistrySeeing begins when one molecule changes shapeOlfaction and VibrationsSmell may listen for molecular vibrationsRespiratory Electron TransferLife runs on carefully stepped electron fallsProton PumpsCells use quantum-scale gates for protonsDNA Proton TransferA proton in the wrong place can change a letterDecoherence in BiologyWarm life keeps some quantum effects and loses othersPhotosynthetic ProtectionPlants dump dangerous energy before it burns themBioluminescenceLiving chemistry releases light from an excited stateLimits of Quantum BiologyQuantum biology is powerful because it is specific
Q-Plain SimFurther explorationOpen the full simulator when a lesson sparks a question
Open Q-Plain Sim
FoundationsQ-Plain Sim
Atomic physicsQ-Plain Sim
Quantum informationQ-Plain Sim
Quantum computingQ-Plain Sim
Quantum sensingQ-Plain Sim
Quantum cryptographyQ-Plain Sim
Quantum algorithmsQ-Plain Sim
Research workbenchQ-Plain Sim
Circuit Research LabLonger circuit experiments, state inspectionQuantum Chemistry LabOrbital basis exploration, chemistry statesProtein and Nucleic Acid LabMolecular state structure for biological and chemical systemsMolecular Dynamics LabBound states, lattice motionNeuron Electrophysiology LabSignal behavior and observation workflow for future quantum-bio experiments