Quantum Information Processing Explained: Quantum Gates and Circuits Demystified

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A tutorial series on quantum information processing has released its third installment, focusing on quantum gates and circuits. The article builds on mathematical foundations covered in earlier parts, using worked examples verified with Qiskit and Cirq code. To ease understanding, the piece first reviews classical logic gates — including NOT, AND, OR, and XOR — drawing on analogies from the National Institute of Standards and Technology. Classical computers rely on these logic gates, physically implemented as transistors, to process binary data represented as voltage levels. The tutorial aims to bridge classical computing concepts with quantum gate operations for readers with basic Python familiarity.

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