2024/03/20 by Krol, Anna M., Al-Ars, Zaid · 2 citations
#FOS: Physical sciences #Quantum Physics (quant-ph)
paper · doi:10.48550/arxiv.2403.13692
This paper proposes a new optimized quantum block-ZXZ decomposition method [7,8,10] that results in more optimal quantum circuits than the quantum Shannon decomposition (QSD)[27], which was introduced in 2006 by Shende et al. The decomposition is applied recursively to generic quantum gates, and can take advantage of existing and future small-circuit optimizations. Because our method uses only one-qubit gates and uniformly controlled rotation-Z gates, it can easily be adapted to use other types of multi-qubit gates. With the proposed decomposition, a general 3-qubit gate can be decomposed using 19 CNOT gates (rather than 20). For general n-qubit gates, the proposed decomposition generates circuits that have (22)/(48)4n - (3)/(2)2n +(5)/(3) CNOT gates, which is less that the best known exact decomposition algorithm by (4n-2 -1)/3 CNOT gates.