6.1 Binary Digit (Bit) and Logic Gates6.2 Physical Realisations of Classical Bits and Logic Gates6.3 Quantum Binary Digit (Qubit) and Quantum Logic Gates6.4 Reversible Computing6.5 Entanglement6.6 Quantum Gate Decompositions6.7 Physical Realisations of Qubits and Quantum Gates6.8 Quantum Hardware and SimulatorsSummary