Steven Geller

Quantum Computing,
End to End

A free field guide for computer scientists and engineers—from state vectors and circuits to compilers, fault tolerance, hardware, and evidence.

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95 persistent chapter and guide URLs · Edition 2026.1 · No account required

One computation, end to end. Prepare a state, transform it, model the noise channel, then keep a classical measurement record. The book connects every abstraction to this round trip.

Choose a route

Enter at the layer you need

Build the model

Start from computation as physics, then earn the mathematics and circuit model.

Orientation guides →02

Work like an engineer

Move through code, compilation, noise, benchmarking, hardware, and system constraints.

Practical software →03

Evaluate the evidence

Test application, company, and roadmap claims against baselines and proof gates.

Evidence discipline →

The complete stack

From first principles to defensible decisions

The sections are ordered so abstractions meet the physical and economic constraints beneath them. Use the whole path or enter through a guide and repair prerequisites as needed.

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Orientation GuidesEight re-entry points for the concepts the rest of the book assumes.8 Part I. Mental ModelComputation as a physical process: qubits, measurement, interference, and entanglement without the myths.7 Part II. Mathematical CoreThe linear algebra quantum computing uses, introduced in the order the machinery needs it.8 Part III. Circuit ModelGates, controlled operations, Bell states, no-cloning, and the costs hidden by a circuit diagram.7 Part IV. Protocols and AlgorithmsProtocols and algorithms traced from mechanism to complexity claim and practical constraint.13 Part V. Practical SoftwareSimulation, SDKs, transpilation, noise, benchmarking, and reproducible computational work.9 Part VI. Reliability and Fault ToleranceDecoherence, error correction, decoders, logical operations, and the overhead behind reliability.9 Part VII. Hardware ArchitectureThe complete machine stack and the engineering tradeoffs among leading hardware modalities.10 Part VIII. Applications and StrategyApplications evaluated against buyers, classical baselines, evidence levels, and decision gates.9 Part IX. Company and InvestingA diligence system for roadmaps, moats, markets, incentives, and the strength of company evidence.10 Part X. CapstonesFive public artifacts that force the technical and decision layers into inspectable work.5

Evidence before posture

The publication shows its work and its gaps

Persistent routesEvery guide and chapter has a stable canonical URL and its own discovery metadata.

Visible provenanceChapter-level references, publication dates, and review status are shown where readers use them.

Corrections in publicThe editorial method, errata process, and publication changelog are readable without an account.

Quantum Computing,End to End