1. Efficient design of a quantum absolute-value circuit using Clifford+T gates.
- Author
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Orts, Francisco, Ortega, Gloria, Combarro, Elías F., Rúa, Ignacio F., Puertas, Antonio M., and Garzón, Ester M.
- Subjects
- *
QUANTUM computers , *CIRCUIT complexity , *QUBITS , *QUANTUM computing , *INTEGERS , *ABSOLUTE value - Abstract
Current quantum computers have a limited number of resources and are heavily affected by internal and external noise. Therefore, small, noise-tolerant circuits are of great interest. With regard to circuit size, it is especially important to reduce the number of required qubits. Concerning to fault-tolerance, circuits entirely built with Clifford+T gates allow the use of error correction codes. However, the T-gate has an excessive cost, so circuits with a high number of T-gates should be avoided. This work focuses on optimising in such terms an operation that is widely used in larger circuits and algorithms: the calculation of the absolute-value of two's complement encoded integers. The proposed circuit halves the number of required T gates with respect to the best circuit currently available in the literature. Moreover, our circuit requires at least 2 qubits less than the other circuits for such an operation. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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