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Quantum computing guides

Free guides on quantum computers, quantum programming with Qiskit, quantum algorithms, quantum cryptography, quantum machine learning and quantum hardware.

• What is a quantum computer and how does it work?
  What a quantum computer is, how qubits differ from bits, what quantum computers are good for and where they stand today. A plain-language guide, no physics needed.
• Getting started with quantum programming: your first Qiskit circuit
  How to start quantum programming: installing Qiskit, writing your first quantum circuit (a Bell state) and what to learn next. A step-by-step guide for Python developers.
• Quantum cryptography: how do quantum computers affect encryption?
  Can quantum computers break encryption? Shor’s and Grover’s algorithms, post-quantum cryptography (ML-KEM, ML-DSA) and quantum key distribution (BB84) explained.
• What is quantum machine learning?
  What quantum machine learning is, how it works and whether it really helps: variational circuits, quantum classifiers, realistic limits and first steps with PennyLane.
• How are quantum computers built? Qubit types compared
  Superconducting qubits, trapped ions, neutral atoms, photons and spin qubits: what quantum computers are made of, who chose which path, and the pros and cons.
• Quantum algorithms: what each one does and how it works
  The most important quantum algorithms in plain language: Deutsch–Jozsa, Bernstein–Vazirani, Grover, the quantum Fourier transform, phase estimation, Shor, VQE and QAOA.