What Is Quantum Information?
The starting point for everything else on QuantumO: what makes information quantum, and why it matters.
Lesson library
Learn quantum information
Every lesson opens with a short, self-contained answer, then expands into a plain-language explanation with key takeaways, terminology, common misconceptions, and sources.
Showing 14 of 14 lessons
What Is a Qubit?
How a qubit differs from a bit, and what physical systems can act as one.
Superposition Explained
What superposition actually claims, and the wording to avoid.
Quantum Entanglement
Correlations without communication — what Bell tests established and what they did not.
Measurement and Probability
How amplitudes become outcomes, and why quantum experiments are run repeatedly.
Classical vs. Quantum Computing
A side-by-side comparison, including where quantum offers no advantage.
How Does Quantum Computing Work?
The prepare–evolve–measure cycle, and why interference is the whole trick.
Quantum Gates and Circuits
The building blocks of quantum programs and how they are composed.
Why Is Quantum Error Correction Necessary?
Noise, decoherence, and the overhead of protecting fragile quantum information.
Quantum Hardware Basics
The main qubit platforms and the engineering trade-offs between them.
Intermediate7 min read
Quantum Communication
Moving quantum information across distance, and the obstacles involved.
Is Quantum Communication Secure?
What QKD guarantees, what it assumes, and how it compares with post-quantum cryptography.
What Is Quantum Teleportation?
The protocol, step by step, and what it is not.
Quantum Sensing Basics
The quietly successful branch of quantum technology.
Beginner5 min read