Month: May 2026

Quantum Key Distribution (QKD) is the most mature application of quantum cryptography. It solves a specific problem: allowing two parties to generate a shared secret key with a guarantee, based on physics, that no eavesdropper has a copy. The best-known
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Y2Q, “Years to Quantum,” refers to the estimated time remaining before a quantum computer capable of breaking widely deployed public-key cryptography becomes operational. It is a planning horizon, not a fixed date, and it drives urgency across government, finance, and
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Quantum Phase Estimation (QPE) is an algorithm that extracts a hidden angle, called a phase, from a quantum operation. When certain quantum operations act on specific quantum states, they rotate those states by a characteristic angle. QPE determines what that
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Quantum computers manipulate qubits through operations called gates, and the Hadamard is one of the most important. It is often the first operation in a quantum algorithm, and understanding it unlocks much of what follows in this book. Here is
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Quantum teleportation transfers the exact quantum state of one particle to another particle at a distant location, without physically moving anything between them. Despite the name, it has nothing to do with science fiction transportation. It is a precisely defined
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