Читать книгу Quantum Computing - Hafiz Md. Hasan Babu - Страница 12

Quantum logic is a great achievement for very-large-scale integrated (VLSI) circuit design, and can work faster than classical logic circuits. Quantum circuits are used to build quantum super computers and can solve the complex problems in polynomial time. Quantum algorithms are used to implement quantum circuits.

Quantum bits have the important property of superposition, which means that the values of quantum bits can stay in more than one position at the same time, which is impossible in the case of classical logic designs. Reversible computation supports binary (0,1) values, whereas quantum logic can hold multiple values (binary, ternary, quaternary, etc). This multi-value support makes quantum circuits more compact and efficient with optimal delay. Unlike the two fixed values 0 or 1 of classical logic, quantum bits can take the values of a linear combination of 0 and 1. Quantum circuits are inherently reversible and there is no dissipation of energy in these circuits. Thus these circuits prevent the loss of information, since energy dissipation causes bit or information loss. The above mentioned properties of quantum logic circuits have motivated researchers to design circuit components using quantum logic.