https://www.steven-geller.com/playground/quantum/ An 87-chapter book on quantum computing, from the physics of a qubit to company diligence — read aloud, chapter by chapter. en-us Steven Geller no https://www.steven-geller.com/playground/quantum/book/00-how-to-use-the-book-layer/ quantum-mastery-00-how-to-use-the-book-layer How to read Quantum Mastery: the order of the ten parts, what every chapter contains, and the study loop that turns reading into working knowledge. Sat, 25 Jul 2026 09:00:00 -0000 6:08 https://www.steven-geller.com/playground/quantum/book/orientation-01-computation-information-and-qubits/ quantum-mastery-orientation-01-computation-information-and-qubits What a qubit actually is: amplitudes versus probabilities, a Hadamard interference calculation by hand, and reversibility as the bridge to quantum gates. Fri, 24 Jul 2026 09:00:00 -0000 10:53 https://www.steven-geller.com/playground/quantum/book/orientation-02-amplitudes-measurement-and-gates/ quantum-mastery-orientation-02-amplitudes-measurement-and-gates The one-qubit toolkit: normalize state vectors, apply X Z H and S gates as matrices, and watch interference and basis-dependent measurement in hand arithmetic. Thu, 23 Jul 2026 09:00:00 -0000 10:09 https://www.steven-geller.com/playground/quantum/book/orientation-03-multi-qubit-circuits-entanglement-and-no-hype/ quantum-mastery-orientation-03-multi-qubit-circuits-entanglement-and-no-hype Two qubits change everything: tensor products, CNOT, a Bell state by hand, the separability test for entanglement, no-cloning, and protocols without hype. Wed, 22 Jul 2026 09:00:00 -0000 10:49 https://www.steven-geller.com/playground/quantum/book/orientation-04-quantum-algorithms-and-speedups/ quantum-mastery-orientation-04-quantum-algorithms-and-speedups Where quantum speedups come from: problem structure, phase kickback, Grover computed by hand, Shor as period finding, and why query counts are not runtimes. Tue, 21 Jul 2026 09:00:00 -0000 12:34 https://www.steven-geller.com/playground/quantum/book/orientation-05-noise-error-correction-and-fault-tolerance/ quantum-mastery-orientation-05-noise-error-correction-and-fault-tolerance Why noise dominates quantum computing: T1 and T2, syndromes, surface codes and thresholds, decoders, and the proof gates of a fault-tolerance roadmap. Mon, 20 Jul 2026 09:00:00 -0000 13:02 https://www.steven-geller.com/playground/quantum/book/orientation-06-hardware-architecture-and-the-full-stack/ quantum-mastery-orientation-06-hardware-architecture-and-the-full-stack The quantum stack from application to physical qubits, the metrics that outrank qubit count, and the strengths and bottlenecks of each hardware modality. Sun, 19 Jul 2026 09:00:00 -0000 10:09 https://www.steven-geller.com/playground/quantum/book/orientation-07-applications-evidence-and-strategy/ quantum-mastery-orientation-07-applications-evidence-and-strategy How to judge quantum application claims: an evidence ladder from narrative to customer ROI, worked chemistry and optimization examples, and a decision frame. Sat, 18 Jul 2026 09:00:00 -0000 11:54 https://www.steven-geller.com/playground/quantum/book/01-computation-is-physical/ quantum-mastery-01-computation-is-physical Why every quantum claim is really a claim about a physical system: state, control, noise, and measurement, and how to read qubit counts like an engineer. Fri, 17 Jul 2026 09:00:00 -0000 9:01 https://www.steven-geller.com/playground/quantum/book/02-classical-information-gates-circuits-reversibility/ quantum-mastery-02-classical-information-gates-circuits-reversibility Classical bits, gates, and circuits through the reversibility lens: why quantum operations must be invertible and how to embed AND without erasing information. Thu, 16 Jul 2026 09:00:00 -0000 8:40 https://www.steven-geller.com/playground/quantum/book/03-probability-vs-amplitude/ quantum-mastery-03-probability-vs-amplitude Why quantum amplitudes are not probabilities: signs, phases, the Born rule, and the one-gate example that shows what compression destroys. Wed, 15 Jul 2026 09:00:00 -0000 7:47 https://www.steven-geller.com/playground/quantum/book/04-qubits-without-mysticism/ quantum-mastery-04-qubits-without-mysticism A qubit explained without mysticism: one normalized state, one measurement rule, and the operational test that separates honest explanations from slogans. Tue, 14 Jul 2026 09:00:00 -0000 7:57 https://www.steven-geller.com/playground/quantum/book/05-measurement-and-what-it-does-not-mean/ quantum-mastery-05-measurement-and-what-it-does-not-mean What quantum measurement actually does: basis-dependent sampling that changes the state, why more shots do not fix a wrong circuit, and three myths to retire. Mon, 13 Jul 2026 09:00:00 -0000 8:03 https://www.steven-geller.com/playground/quantum/book/06-interference-as-engine-of-quantum-algorithms/ quantum-mastery-06-interference-as-engine-of-quantum-algorithms How interference powers quantum algorithms: amplitudes combine before probabilities exist, shown in a three-gate circuit. Sun, 12 Jul 2026 09:00:00 -0000 8:10 https://www.steven-geller.com/playground/quantum/book/07-entanglement-without-faster-than-light-myths/ quantum-mastery-07-entanglement-without-faster-than-light-myths Entanglement as non-factorable joint state: the Bell state built with two gates, why its correlations cannot carry messages, and what it is actually good for. Sat, 11 Jul 2026 09:00:00 -0000 8:22 https://www.steven-geller.com/playground/quantum/book/08-complex-numbers-for-quantum-computing/ quantum-mastery-08-complex-numbers-for-quantum-computing Complex numbers as working tools for quantum computing: conjugate, magnitude, and phase, why the Born rule squares magnitudes, and which phase changes matter. Fri, 10 Jul 2026 09:00:00 -0000 7:35 https://www.steven-geller.com/playground/quantum/book/09-vectors-bases-and-amplitudes/ quantum-mastery-09-vectors-bases-and-amplitudes Quantum states as coordinate vectors: bases, ordering conventions, normalization, and the Born rule, with the three labels to write before every calculation. Thu, 09 Jul 2026 09:00:00 -0000 8:05 https://www.steven-geller.com/playground/quantum/book/10-inner-products-orthogonality-and-projection/ quantum-mastery-10-inner-products-orthogonality-and-projection Inner products, conjugate transpose, orthogonality, and projection: the arithmetic behind measurement probabilities and state updates. Wed, 08 Jul 2026 09:00:00 -0000 6:41 https://www.steven-geller.com/playground/quantum/book/11-matrices-as-gates/ quantum-mastery-11-matrices-as-gates Multiply Pauli and Hadamard matrices against state vectors by hand, and learn why unitarity is the contract every gate must keep. Tue, 07 Jul 2026 09:00:00 -0000 5:43 https://www.steven-geller.com/playground/quantum/book/12-unitary-operations-and-reversibility/ quantum-mastery-12-unitary-operations-and-reversibility Why the condition U-dagger-U equals I decides which matrices can be quantum gates, and what reversibility costs classical subroutines. Mon, 06 Jul 2026 09:00:00 -0000 6:06 https://www.steven-geller.com/playground/quantum/book/13-tensor-products-and-state-space-growth/ quantum-mastery-13-tensor-products-and-state-space-growth Tensor products build multi-qubit states with 2^n amplitudes; learn the product rule and why that growth is not readable output. Sun, 05 Jul 2026 09:00:00 -0000 5:50 https://www.steven-geller.com/playground/quantum/book/14-observables-eigenvectors-and-measurement/ quantum-mastery-14-observables-eigenvectors-and-measurement Observables, eigenvalues, and expectation values: what a quantum measurement can return and what an average over shots means. Sat, 04 Jul 2026 09:00:00 -0000 6:26 https://www.steven-geller.com/playground/quantum/book/15-density-matrices-and-mixed-states/ quantum-mastery-15-density-matrices-and-mixed-states Density matrices describe pure and mixed states, carry coherence in off-diagonal entries, and model what noise does to qubits. Fri, 03 Jul 2026 09:00:00 -0000 5:59 https://www.steven-geller.com/playground/quantum/book/16-circuit-notation-as-programming-language/ quantum-mastery-16-circuit-notation-as-programming-language Read quantum circuit diagrams as ordered programs: wires, gates, controls, depth, width, measurement, and classical output. Thu, 02 Jul 2026 09:00:00 -0000 7:10 https://www.steven-geller.com/playground/quantum/book/17-one-qubit-gates-and-bloch-sphere/ quantum-mastery-17-one-qubit-gates-and-bloch-sphere One-qubit gates as rotations on the Bloch sphere, global versus relative phase, and why the sequence HZH flips a bit. Wed, 01 Jul 2026 09:00:00 -0000 6:16 https://www.steven-geller.com/playground/quantum/book/18-controlled-gates-and-reversible-classical-computation/ quantum-mastery-18-controlled-gates-and-reversible-classical-computation How controlled gates make classical logic reversible: CNOT and Toffoli traced branch by branch, ancillas, and the compute-use-uncompute pattern. Tue, 30 Jun 2026 09:00:00 -0000 7:21 https://www.steven-geller.com/playground/quantum/book/19-multi-qubit-circuits/ quantum-mastery-19-multi-qubit-circuits Multi-qubit circuits demand convention discipline: tensor-product expansions, gate scope, basis order, and why wire count says nothing about entanglement. Mon, 29 Jun 2026 09:00:00 -0000 6:20 https://www.steven-geller.com/playground/quantum/book/20-bell-states-and-ghz-states/ quantum-mastery-20-bell-states-and-ghz-states Build Bell and GHZ states by hand with H and CNOT, predict their measurement statistics, and learn what an entanglement demo does and does not prove. Sun, 28 Jun 2026 09:00:00 -0000 6:44 https://www.steven-geller.com/playground/quantum/book/21-no-cloning-and-why-copying-breaks-quantum-logic/ quantum-mastery-21-no-cloning-and-why-copying-breaks-quantum-logic The no-cloning theorem proved from linearity in a few lines, which copying still works, and why the result shapes quantum software and error correction. Sat, 27 Jun 2026 09:00:00 -0000 6:55 https://www.steven-geller.com/playground/quantum/book/22-circuit-cost-depth-width-gate-set-connectivity/ quantum-mastery-22-circuit-cost-depth-width-gate-set-connectivity A circuit's real cost is set by width, depth, gate set, connectivity, and measurement; learn the audit table that separates runnable circuits from drawings. Fri, 26 Jun 2026 09:00:00 -0000 6:51 https://www.steven-geller.com/playground/quantum/book/23-bell-tests-and-nonclassical-correlations/ quantum-mastery-23-bell-tests-and-nonclassical-correlations What a Bell test actually rules out, why matching random bits are not enough, and why nonclassical correlation still cannot send a controllable message. Thu, 25 Jun 2026 09:00:00 -0000 6:54 https://www.steven-geller.com/playground/quantum/book/24-superdense-coding/ quantum-mastery-24-superdense-coding Superdense coding traced gate by gate: two classical bits from one transmitted qubit, paid for in advance with a shared Bell pair. Wed, 24 Jun 2026 09:00:00 -0000 7:04 https://www.steven-geller.com/playground/quantum/book/25-teleportation/ quantum-mastery-25-teleportation Quantum teleportation as a protocol with a ledger: one Bell pair, two classical bits, a Bell measurement, and a correction that rebuilds the state. Tue, 23 Jun 2026 09:00:00 -0000 6:51 https://www.steven-geller.com/playground/quantum/book/26-quantum-key-distribution/ quantum-mastery-26-quantum-key-distribution How quantum key distribution uses measurement disturbance to expose eavesdroppers, and how it differs from post-quantum cryptography. Mon, 22 Jun 2026 09:00:00 -0000 9:01 https://www.steven-geller.com/playground/quantum/book/27-oracles-and-query-complexity/ quantum-mastery-27-oracles-and-query-complexity Oracle models and query complexity: counting quantum speedups honestly, the phase-kickback trick, and why the black box itself has a price. Sun, 21 Jun 2026 09:00:00 -0000 7:05 https://www.steven-geller.com/playground/quantum/book/28-deutsch-deutsch-jozsa-and-bernstein-vazirani/ quantum-mastery-28-deutsch-deutsch-jozsa-and-bernstein-vazirani Deutsch, Deutsch-Jozsa, and Bernstein-Vazirani: the teaching algorithms that turn global properties into phase patterns readable in one query. Sat, 20 Jun 2026 09:00:00 -0000 7:10 https://www.steven-geller.com/playground/quantum/book/29-simon-and-hidden-structure/ quantum-mastery-29-simon-and-hidden-structure Simon's algorithm: a hidden xor promise turns quantum samples into linear equations, the template that leads to period finding and Shor. Fri, 19 Jun 2026 09:00:00 -0000 7:24 https://www.steven-geller.com/playground/quantum/book/30-grover-and-amplitude-amplification/ quantum-mastery-30-grover-and-amplitude-amplification Grover search as amplitude amplification: the quadratic speedup, the tuned iteration count, and the overshoot that punishes running too long. Thu, 18 Jun 2026 09:00:00 -0000 7:19 https://www.steven-geller.com/playground/quantum/book/31-quantum-fourier-transform/ quantum-mastery-31-quantum-fourier-transform The quantum Fourier transform as a basis change: roots of unity, phase progressions, and why the QFT reveals periodicity instead of creating speed. Wed, 17 Jun 2026 09:00:00 -0000 6:34 https://www.steven-geller.com/playground/quantum/book/32-phase-estimation/ quantum-mastery-32-phase-estimation Phase estimation: counting qubits, controlled powers of a unitary, and the inverse QFT combine to read eigenphases at a chosen precision. Tue, 16 Jun 2026 09:00:00 -0000 6:50 https://www.steven-geller.com/playground/quantum/book/33-shor-as-period-finding/ quantum-mastery-33-shor-as-period-finding Shor's algorithm as period finding: the modular-exponentiation reduction, the phase-estimation engine, and the resources real keys demand. Mon, 15 Jun 2026 09:00:00 -0000 7:28 https://www.steven-geller.com/playground/quantum/book/34-hamiltonian-simulation/ quantum-mastery-34-hamiltonian-simulation Hamiltonian simulation as an engineering workload: time evolution, product formulas, and how to turn a molecule into an auditable resource estimate. Sun, 14 Jun 2026 09:00:00 -0000 7:41 https://www.steven-geller.com/playground/quantum/book/35-variational-algorithms-and-their-limits/ quantum-mastery-35-variational-algorithms-and-their-limits Variational quantum algorithms as hybrid loops: ansatz, optimizer, shot costs, barren plateaus, and why the classical baseline decides. Sat, 13 Jun 2026 09:00:00 -0000 7:15 https://www.steven-geller.com/playground/quantum/book/36-python-and-quantum-programming-workflow/ quantum-mastery-36-python-and-quantum-programming-workflow A reproducible Python workflow for quantum experiments: pinned environments, runnable tests, run records, and the line between stable ideas and drifting SDKs. Fri, 12 Jun 2026 09:00:00 -0000 6:36 https://www.steven-geller.com/playground/quantum/book/37-building-a-small-simulator-from-scratch/ quantum-mastery-37-building-a-small-simulator-from-scratch Build a minimal statevector simulator in Python: normalization, unitary gates, basis ordering, Born-rule sampling, and the tests that catch wrong mental models. Thu, 11 Jun 2026 09:00:00 -0000 6:35 https://www.steven-geller.com/playground/quantum/book/38-qiskit-primitives-and-circuit-execution/ quantum-mastery-38-qiskit-primitives-and-circuit-execution Qiskit-style circuit execution: primitives, backends, shot counts and standard error, transpilation metadata, and the debugging ladder to hardware. Wed, 10 Jun 2026 09:00:00 -0000 7:06 https://www.steven-geller.com/playground/quantum/book/39-cirq-and-alternative-toolchains/ quantum-mastery-39-cirq-and-alternative-toolchains Comparing quantum SDKs by circuit model, simulator behavior, backend fit, API stability, and reproducibility rather than popularity. Tue, 09 Jun 2026 09:00:00 -0000 6:27 https://www.steven-geller.com/playground/quantum/book/40-transpilation-and-hardware-aware-compilation/ quantum-mastery-40-transpilation-and-hardware-aware-compilation How transpilation rewrites circuits for real gate sets and topologies: routing overhead, compiled depth, error budgets, and checkable claims. Mon, 08 Jun 2026 09:00:00 -0000 6:48 https://www.steven-geller.com/playground/quantum/book/41-noise-models-and-noisy-simulation/ quantum-mastery-41-noise-models-and-noisy-simulation Noise models and noisy simulation: bit-flip and depolarizing channels, ideal-versus-noisy comparison, and diagnosing error patterns. Sun, 07 Jun 2026 09:00:00 -0000 7:05 https://www.steven-geller.com/playground/quantum/book/42-benchmarking-quantum-programs/ quantum-mastery-42-benchmarking-quantum-programs How to benchmark quantum programs honestly: baselines first, shot-noise arithmetic, explicit evidence labels, and artifacts anyone can rerun. Sat, 06 Jun 2026 09:00:00 -0000 6:52 https://www.steven-geller.com/playground/quantum/book/43-resource-estimation-for-fault-tolerant-algorithms/ quantum-mastery-43-resource-estimation-for-fault-tolerant-algorithms Turn a logical quantum workload into auditable physical-qubit and runtime estimates, with sensitivity analysis that exposes the dominant assumption. Fri, 05 Jun 2026 09:00:00 -0000 6:31 https://www.steven-geller.com/playground/quantum/book/44-reproducible-quantum-labs/ quantum-mastery-44-reproducible-quantum-labs Package quantum experiments so anyone can rerun them: exact commands, seeds, expected outputs, shot statistics, failure modes, and honest limitations. Thu, 04 Jun 2026 09:00:00 -0000 5:56 https://www.steven-geller.com/playground/quantum/book/45-decoherence-and-error-channels/ quantum-mastery-45-decoherence-and-error-channels Decoherence, bit-flip and depolarizing channels, and the coherence budget: how ideal circuits become noisy data and how to diagnose what went wrong. Wed, 03 Jun 2026 09:00:00 -0000 6:16 https://www.steven-geller.com/playground/quantum/book/46-error-mitigation-vs-error-correction/ quantum-mastery-46-error-mitigation-vs-error-correction Error mitigation cleans estimates from noisy runs; error correction protects logical information. Learn the boundary and the evidence each side needs. Tue, 02 Jun 2026 09:00:00 -0000 6:18 https://www.steven-geller.com/playground/quantum/book/47-stabilizers-and-syndrome-measurement/ quantum-mastery-47-stabilizers-and-syndrome-measurement Syndrome measurement reveals which error struck without reading the protected state, the measurement trick that makes quantum error correction possible. Mon, 01 Jun 2026 09:00:00 -0000 6:06 https://www.steven-geller.com/playground/quantum/book/48-repetition-bit-flip-phase-flip-and-shor-codes/ quantum-mastery-48-repetition-bit-flip-phase-flip-and-shor-codes Trace the three-qubit bit-flip and phase-flip codes and Shor nine-qubit code by hand, and learn exactly which errors each small code cannot fix. Sun, 31 May 2026 09:00:00 -0000 6:22 https://www.steven-geller.com/playground/quantum/book/49-surface-codes-and-threshold-intuition/ quantum-mastery-49-surface-codes-and-threshold-intuition Surface codes, code distance, and threshold intuition: why local checks dominate fault-tolerance roadmaps and what the overhead really costs. Sat, 30 May 2026 09:00:00 -0000 7:00 https://www.steven-geller.com/playground/quantum/book/50-ldpc-bosonic-cat-gkp-and-topological-approaches/ quantum-mastery-50-ldpc-bosonic-cat-gkp-and-topological-approaches How to compare LDPC, bosonic, cat, GKP, and topological error-correction approaches by physical assumptions, overhead, evidence, and proof gates. Fri, 29 May 2026 09:00:00 -0000 7:52 https://www.steven-geller.com/playground/quantum/book/51-decoders-and-real-time-classical-control/ quantum-mastery-51-decoders-and-real-time-classical-control Why fault tolerance needs real-time classical decoding: syndrome streams, latency budgets, Pauli frames, and control-stack bottlenecks. Thu, 28 May 2026 09:00:00 -0000 6:52 https://www.steven-geller.com/playground/quantum/book/52-logical-qubits-and-reliable-operations/ quantum-mastery-52-logical-qubits-and-reliable-operations How to evaluate a logical-qubit claim: error suppression, operation set, lifetime, cycle depth, overhead, and relevance to a real workload. Wed, 27 May 2026 09:00:00 -0000 7:11 https://www.steven-geller.com/playground/quantum/book/53-useful-quantum-computers-are-systems-engineering-projects/ quantum-mastery-53-useful-quantum-computers-are-systems-engineering-projects Useful quantum computers are systems engineering projects: learn weakest-layer review, interface discipline, and roadmaps with kill criteria. Tue, 26 May 2026 09:00:00 -0000 6:51 https://www.steven-geller.com/playground/quantum/book/54-full-quantum-computer-stack/ quantum-mastery-54-full-quantum-computer-stack Trace any quantum computation from problem to algorithm, circuit, compiler, control, qubits, readout, and decision, layer by layer. Mon, 25 May 2026 09:00:00 -0000 7:06 https://www.steven-geller.com/playground/quantum/book/55-superconducting-qubits/ quantum-mastery-55-superconducting-qubits Superconducting qubits for engineers: Josephson junctions, transmons, microwave gates, readout resonators, cryogenics, and scaling limits. Sun, 24 May 2026 09:00:00 -0000 7:33 https://www.steven-geller.com/playground/quantum/book/56-trapped-ions/ quantum-mastery-56-trapped-ions Trapped-ion qubits for engineers: identical atomic qubits, laser-driven gates, chain connectivity, slow clocks, and modular scaling. Sat, 23 May 2026 09:00:00 -0000 7:05 https://www.steven-geller.com/playground/quantum/book/57-neutral-atoms/ quantum-mastery-57-neutral-atoms Neutral-atom qubits for engineers: tweezer arrays, Rydberg blockade gates, reconfiguration, atom loss, and logical-scale questions. Fri, 22 May 2026 09:00:00 -0000 6:56 https://www.steven-geller.com/playground/quantum/book/58-photonics/ quantum-mastery-58-photonics Photons are ideal carriers of quantum information and awkward computers. Learn to judge photonics claims by role, loss budget, and proof gates. Thu, 21 May 2026 09:00:00 -0000 9:55 https://www.steven-geller.com/playground/quantum/book/59-silicon-spin-qubits/ quantum-mastery-59-silicon-spin-qubits Silicon spin qubits bet on semiconductor manufacturing to scale quantum hardware. Learn where the analogy holds, where variability bites, and what proof to demand. Wed, 20 May 2026 09:00:00 -0000 8:43 https://www.steven-geller.com/playground/quantum/book/60-cat-qubits-and-bosonic-encodings/ quantum-mastery-60-cat-qubits-and-bosonic-encodings Cat qubits encode quantum information in oscillator states to bias noise. Learn to test overhead promises against gates, readout, and matched baselines. Tue, 19 May 2026 09:00:00 -0000 8:50 https://www.steven-geller.com/playground/quantum/book/61-topological-qubits-and-evidence-standards/ quantum-mastery-61-topological-qubits-and-evidence-standards Topological qubits promise self-protecting hardware at a high evidentiary price. Learn to grade claims with evidence labels, proof gates, and kill criteria. Mon, 18 May 2026 09:00:00 -0000 8:34 https://www.steven-geller.com/playground/quantum/book/62-cryogenics-control-packaging-and-manufacturing/ quantum-mastery-62-cryogenics-control-packaging-and-manufacturing Cryogenics, wiring, packaging, and yield set the real scaling path for quantum hardware. Learn to audit the infrastructure stack behind any qubit roadmap. Sun, 17 May 2026 09:00:00 -0000 8:46 https://www.steven-geller.com/playground/quantum/book/63-quantum-centric-supercomputing-and-hybrid-workflows/ quantum-mastery-63-quantum-centric-supercomputing-and-hybrid-workflows Hybrid quantum-classical workflows are loops, not magic. Learn to evaluate partitioning, latency, data movement, and the classical baseline they must beat. Sat, 16 May 2026 09:00:00 -0000 8:19 https://www.steven-geller.com/playground/quantum/book/64-what-makes-a-problem-quantum-suitable/ quantum-mastery-64-what-makes-a-problem-quantum-suitable A problem is quantum-suitable only when structure, baseline, hardware, and workflow economics line up. Learn the screen to apply before any pilot. Fri, 15 May 2026 09:00:00 -0000 8:19 https://www.steven-geller.com/playground/quantum/book/65-quantum-simulation-and-chemistry/ quantum-mastery-65-quantum-simulation-and-chemistry Chemistry is quantum computing's most natural application and still a hard business case. Learn to read encodings, resource estimates, and classical baselines. Thu, 14 May 2026 09:00:00 -0000 9:21 https://www.steven-geller.com/playground/quantum/book/66-materials-energy-and-industrial-science/ quantum-mastery-66-materials-energy-and-industrial-science How to judge quantum opportunities in materials, energy, and industrial science: name the property, the workflow, the baseline, and the resource gap. Wed, 13 May 2026 09:00:00 -0000 7:16 https://www.steven-geller.com/playground/quantum/book/67-optimization-where-caution-is-required/ quantum-mastery-67-optimization-where-caution-is-required Why quantum optimization claims demand caution: strong classical heuristics, encoding costs, sampling noise, and the benchmark hygiene that decides who wins. Tue, 12 May 2026 09:00:00 -0000 7:15 https://www.steven-geller.com/playground/quantum/book/68-cryptography-pqc-qkd-and-security-migration/ quantum-mastery-68-cryptography-pqc-qkd-and-security-migration How to plan quantum security response: separate Shor risk, PQC migration, and QKD infrastructure, then sequence the work by asset lifetime. Mon, 11 May 2026 09:00:00 -0000 8:08 https://www.steven-geller.com/playground/quantum/book/69-quantum-machine-learning-and-benchmark-discipline/ quantum-mastery-69-quantum-machine-learning-and-benchmark-discipline A checklist for quantum machine learning claims: data encoding cost, tuned classical baselines, trainability, noise, and what expectation values measure. Sun, 10 May 2026 09:00:00 -0000 7:20 https://www.steven-geller.com/playground/quantum/book/70-sensing-navigation-and-adjacent-quantum-technologies/ quantum-mastery-70-sensing-navigation-and-adjacent-quantum-technologies Quantum sensing, timing, and navigation are not quantum computing, and that is the opportunity: different buyers, timelines, and evidence to diligence. Sat, 09 May 2026 09:00:00 -0000 7:31 https://www.steven-geller.com/playground/quantum/book/71-application-evidence-levels/ quantum-mastery-71-application-evidence-levels A labeling system for quantum application claims, from theory and simulation to pilots and production, so each kind of evidence gets the right weight. Fri, 08 May 2026 09:00:00 -0000 6:56 https://www.steven-geller.com/playground/quantum/book/72-when-to-build-partner-wait-or-avoid/ quantum-mastery-72-when-to-build-partner-wait-or-avoid A decision framework for quantum opportunities: when to build, partner, invest, monitor, wait, or avoid, and the proof gates that move you between labels. Thu, 07 May 2026 09:00:00 -0000 7:00 https://www.steven-geller.com/playground/quantum/book/73-quantum-company-landscape/ quantum-mastery-73-quantum-company-landscape How to map quantum companies by layer, from hardware to security, and assign each category the proof gate its claims must actually pass. Wed, 06 May 2026 09:00:00 -0000 7:20 https://www.steven-geller.com/playground/quantum/book/74-hardware-modality-diligence/ quantum-mastery-74-hardware-modality-diligence How to compare quantum hardware companies across modalities with proof gates, kill criteria, and a matrix that separates physics bets from execution bets. Tue, 05 May 2026 09:00:00 -0000 7:45 https://www.steven-geller.com/playground/quantum/book/75-software-and-developer-platform-diligence/ quantum-mastery-75-software-and-developer-platform-diligence How to diligence a quantum software or developer-platform company: workflow ownership, switching costs, hardware dependence, and proof of value. Mon, 04 May 2026 09:00:00 -0000 7:13 https://www.steven-geller.com/playground/quantum/book/76-error-correction-stack-diligence/ quantum-mastery-76-error-correction-stack-diligence How to diligence an error-correction-stack company: decoders, controls, logical qubits, and whether the bottleneck it owns is measurable. Sun, 03 May 2026 09:00:00 -0000 7:19 https://www.steven-geller.com/playground/quantum/book/77-application-company-diligence/ quantum-mastery-77-application-company-diligence How to diligence a quantum application company: buyer, classical baseline, data access, quantum resource assumptions, and timing. Sat, 02 May 2026 09:00:00 -0000 6:40 https://www.steven-geller.com/playground/quantum/book/78-supply-chain-and-infrastructure-diligence/ quantum-mastery-78-supply-chain-and-infrastructure-diligence How to diligence quantum supply-chain and infrastructure companies, from cryogenics and control electronics to packaging and calibration. Fri, 01 May 2026 09:00:00 -0000 7:15 https://www.steven-geller.com/playground/quantum/book/79-market-timing-and-wedge-selection/ quantum-mastery-79-market-timing-and-wedge-selection How to choose a quantum startup wedge: match technical readiness, customer urgency, capital intensity, and timing before the market exists. Thu, 30 Apr 2026 09:00:00 -0000 6:37 https://www.steven-geller.com/playground/quantum/book/80-moats-partnerships-and-standards/ quantum-mastery-80-moats-partnerships-and-standards How to tell a durable quantum company moat from press and partnerships, and what standards participation actually proves. Wed, 29 Apr 2026 09:00:00 -0000 7:11 https://www.steven-geller.com/playground/quantum/book/81-reading-roadmaps-like-an-operator/ quantum-mastery-81-reading-roadmaps-like-an-operator How to read a quantum company roadmap like an operator: translate milestones into metrics, dependencies, proof gates, and watch items. Tue, 28 Apr 2026 09:00:00 -0000 6:44 https://www.steven-geller.com/playground/quantum/book/82-investment-memo-and-startup-thesis-templates/ quantum-mastery-82-investment-memo-and-startup-thesis-templates Templates for quantum investment memos and startup theses that tie decisions to source-labeled evidence, proof gates, kill criteria, and named alternatives. Mon, 27 Apr 2026 09:00:00 -0000 6:34 https://www.steven-geller.com/playground/quantum/book/83-full-stack-algorithm-trace/ quantum-mastery-83-full-stack-algorithm-trace Trace one quantum algorithm from problem and math through circuit, code, noise, and hardware to a resource estimate and a decision a reviewer can inspect. Sun, 26 Apr 2026 09:00:00 -0000 6:44 https://www.steven-geller.com/playground/quantum/book/84-hardware-constrained-lab/ quantum-mastery-84-hardware-constrained-lab Build a lab that compares an ideal quantum circuit with its hardware-constrained version across connectivity, native gates, noise, and timing budgets. Sat, 25 Apr 2026 09:00:00 -0000 6:37 https://www.steven-geller.com/playground/quantum/book/85-application-evidence-dossier/ quantum-mastery-85-application-evidence-dossier Assemble a quantum application evidence dossier that starts from the buyer and the classical baseline before it scores any quantum method. Fri, 24 Apr 2026 09:00:00 -0000 6:39 https://www.steven-geller.com/playground/quantum/book/86-company-diligence-memo/ quantum-mastery-86-company-diligence-memo Write a decision-grade quantum company diligence memo with source-labeled evidence, proof gates, kill criteria, and an action you can defend. Thu, 23 Apr 2026 09:00:00 -0000 6:12 https://www.steven-geller.com/playground/quantum/book/87-public-playground-mvp/ quantum-mastery-87-public-playground-mvp Shape a public playground MVP: one coherent learning route with original explanation, checks, practice, assessment, and honest source boundaries. Wed, 22 Apr 2026 09:00:00 -0000 6:09