Your first quantum ideas
Build the basics: qubits, measurement, phase, interference and a first circuit.
Start with one clear idea. Follow it through a circuit, into the hardware, and back to the evidence.
No background needed. No account required.Three useful stops. Take them in order or choose the one you need.
Separate the state from the result you measure.
Start with the ideaConnect preparation, operations and measurement.
See how it worksConnect the circuit to a representative quantum computer.
Explore the ModelSearch a question or explore a subject.
Build the basics: qubits, measurement, phase, interference and a first circuit.
Understand physical and logical qubits, what protection does and where its limits remain.
See how trapped atoms become programmable systems, from analog simulation to gates.
Separate AI for quantum systems from claims about quantum machine learning.
Understand why protecting conventional systems is a different task from building a quantum computer.
Follow the role of light, optical components and measurement in quantum computing.
Place quantum processors alongside classical computers and account for the whole workflow.
Compare superconducting circuits, ions, atoms and photons without relying on qubit count alone.
Ask what a performance number measures and which conclusions the comparison supports.
Distinguish an observation, a proposal and a prediction, then follow the original evidence.
Go deeper with complex amplitudes, operations, measurement and explicit worked calculations.
Connect quantum ideas to engineering choices through source-linked explanations and explicit calculations.
Explore an ideal circuit, a representative machine, or the assumptions behind a number.
Toggle one gate and see the output of an ideal single-qubit circuit.
Try the experiment 02 / INSIDE THE MACHINEExplore a representative superconducting system. Other architectures look different.
Explore the Model 03 / TEACHING CALCULATORSExplore statevector memory and independent trials with explicit assumptions.
Open the calculatorsSix routes into the subject. Each has its own starting point.
Understand states, measurement and what a qubit can tell you.
Begin with a qubitFollow a small circuit from its first operation to its result.
Read your first circuitConnect the quantum idea to the machines that make it work.
Compare the architecturesSee why fragile states need careful control and protection.
Meet the logical qubitAsk where quantum fits and what a useful advantage would require.
Explore a hybrid workflowRead headlines, evidence and security claims with better questions.
Learn to read a claimFollow selected reporting into a worked explanation.
Read the measured spin–photon interface, then compare yield denominators in the hardware guide.
Follow a 19-hour campus link, then separate source emission, fiber output and detector counts.
Read the restricted model-family comparison, then compare error and measurement budgets.
Connect the concepts to a mechanism, compare a decision, or follow the mathematics.
A laboratory result, an engineering proposal and a useful application are different milestones. Our guides keep sources and limitations alongside the ideas.
Choose a route according to the question you want it to answer.
A quantum topic often crosses several field guides. Start with one question, then identify the definition, the interface and the evidence needed to answer it. For a hybrid computation, the algorithm guide explains the intended task, the hardware guide explains what executes, and the benchmark guide helps define a meaningful comparison.
Use a small example to connect the guides. An OpenQASM program needs both language semantics and a backend capability contract. A photonic model needs an input state, an optical transformation and a detector model. A calibration workflow needs a measured signal, a fit and an acceptance rule before its updated parameter is reused.
Keep a short note of what each guide contributes and what it leaves open. A definition is useful without proving that a product implements it; a working interface is useful without proving an advantage. The career projects and video learning routes provide exercises for testing these distinctions.
The numbering is a navigation aid. Choose the guide that answers the least familiar part of your question, then follow a justified connection to another guide if needed.
Use a relevant source-linked article or resource and keep that distinction clear. Do not assume that an absent guide means the subject is unimportant or that a new route has been published.
Field guides, related reading and evidence tools.
The guides cover selected subjects. Follow the source links for details beyond each guide.