Course
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A guided path from “what is a qubit” to Grover’s search in 8 lessons, then 6 more that pick up where it stops. Each lesson builds directly on the one before it, and each links to a live simulation you can play with — so every idea you read about is an idea you can go and poke at until it makes sense.
Quantum Foundations
FreeA guided path from "what is a qubit" to Grover's search — and then inside the machine itself. Eight lessons, each one building on the last, ending somewhere you can run the idea: a live simulation to pull apart, or, for the finale, real hardware.
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What Is a Qubit?
A bit is a switch. A qubit is a direction. Getting that difference straight is most of the battle.
Beginner8 min
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Superposition & Measurement
Measurement is not a passive reading. It is the most violent thing you can do to a quantum state.
Beginner10 min
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Interference: Where the Power Comes From
Not "it tries every answer at once" — but "it arranges for the wrong answers to cancel".
Beginner10 min
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Quantum Tunneling
A particle with too little energy to climb the wall comes out the other side anyway — and nothing was borrowed to do it.
Intermediate12 min
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Gates & Circuits
Every quantum gate is a rotation. Every circuit is a sequence of rotations you can read left to right.
Intermediate12 min
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Entanglement
Two qubits with a definite joint state and no definite individual states. Nothing travels; the correlation was there all along — but it is not the correlation you think.
Intermediate12 min
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Grover's Search
Find a needle in an unsorted haystack of N items in about √N steps — and understand exactly why it is √N and not something better.
Advanced15 min
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Inside a Quantum Computer
The qubit is a circuit you could see with the naked eye, the gates are microwave pulses, and the famous golden chandelier is not the computer — it is the refrigerator.
Intermediate12 min
Advanced Quantum Computing
Included with ProSix lessons past the foundations: the algorithm that threatens RSA, the error correction any real machine will need, the variational methods people actually run on today's hardware, the cryptography story that pays for most of the field, and honest accounts of quantum machine learning and quantum optimisation.
These lessons assume the whole of Quantum Foundations — and the later ones build on each other: quantum machine learning and QAOA both reuse the variational loop from the NISQ lesson. See what Pro includes.
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Shor's Algorithm
Factoring is not the quantum part. Finding the period of a function is — and everything else is number theory you could do on a laptop.
Advanced18 min
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Quantum Error Correction
You cannot copy a qubit, you cannot look at it to check it, and errors are continuous rather than discrete. Error correction works anyway, and how it dodges all three objections is the most beautiful construction in the field.
Advanced20 min
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NISQ Algorithms and VQE
What can you do with a few hundred noisy qubits and no error correction? The honest answer is "less than we hoped", and the reasons why are worth understanding precisely.
Advanced16 min
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Quantum Cryptography
You cannot stop an eavesdropper from listening. You can make listening leave marks that physics guarantees you will find.
Advanced14 min
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Quantum Machine Learning
A parameterised circuit is a machine-learning model you train with a classical optimiser. Whether it is ever a *better* model is the most oversold open question in the field — here is what is actually known.
Advanced16 min
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QAOA and Quantum Optimization
An alternating circuit that tilts a superposition toward good cuts of a graph. Whether it can ever beat classical optimisers is — honestly — still unknown, and knowing exactly why is the real lesson.
Advanced16 min
The same seven ideas as the foundations track, one per morning, each ending at a simulation you can drag. No account needed, no tracking pixels, and the emails are plain text — your address is stored for this course only and never shared.