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QUANTUM COMPUTING WITHOUT THE MYSTICISM

Quantum Computing Fundamentals

Opens with a public argument between Google and IBM over whether a milestone had been reached, because the disagreement turns on exactly what you need to understand. No mathematics beyond arithmetic and no physics background assumed.

  • 6 modules
  • 18 lessons
  • 7 quizzes
  • 80 questions
  • About 9 hours

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Course syllabus

Six modules build in order: what a quantum computer actually is, the three ideas that make it work, what it is genuinely good for, why building one is hard, the hardware landscape and the technologies confused with it, and what to do about it now. Each module ends with a quiz, and a final assessment covers all six. Every lesson and every quiz is free.

  1. 1. What a Quantum Computer Actually Is

    A public argument between Google and IBM over whether a milestone had been reached, and what it reveals about the machine underneath. Qubits, superposition and measurement, explained without mysticism and without the claim that quantum computers try every answer at once.

  2. 2. The Three Ideas That Make It Work

    Superposition, interference and entanglement, in the order that makes them comprehensible. Interference is the engine almost every popular account leaves out, and without it the rest of the field cannot be understood.

  3. 3. What It Is Actually Good For

    The three algorithm families that matter: Shor's algorithm and the cryptography it threatens, Grover's search and why a quadratic speedup is less than it sounds, and simulating nature, which is the application most likely to justify the whole enterprise.

  4. 4. Why It Is Hard

    Decoherence and why the machines need near absolute zero, how error correction was reinvented when copying turned out to be impossible, the physical against logical qubit distinction that headlines routinely omit, and how to read a quantum announcement properly.

  5. 5. The Hardware and the Neighbours

    The competing ways to build a qubit and the tradeoffs each accepts, what it is actually like to use a quantum computer today through the cloud, and the technologies routinely confused with quantum computing that are entirely separate fields.

  6. 6. What To Do About It Now

    The one genuinely urgent action, which is the post-quantum cryptography migration and why its deadline does not depend on when quantum computers arrive, plus an honest framework for deciding whether your organisation should be doing anything else at all.

Source and attribution

Independently written by Srileo Technologies, and vendor-neutral. Cited results include the 2019 Google Sycamore experiment and IBM's published rebuttal, Google's December 2024 below-threshold error correction result on Willow, and the NIST post-quantum standards FIPS 203, 204 and 205 published in August 2024. Qubit counts, logical-qubit records and roadmap dates move quickly and are attributed as of writing; where a number is volatile the lesson teaches the distinction that matters, such as physical against logical qubits, rather than the number.