Approaching the theoretical limit in quantum gate decomposition

Péter Rakyta1,2 and Zoltán Zimborás3,4

1Department of Physics of Complex Systems, Eötvös Loránd University, Budapest, Hungary
2Wigner Research Center for Physics, 29–33 Konkoly–Thege Miklos Str., H- 1121 Budapest, Hungary
3Wigner Research Center for Physics, 29–33 Konkoly–Thege Miklos Str., H-1121 Budapest, Hungary
4BME-MTA Lendület Quantum Information Theory Research Group, Budapest, Hungary

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Abstract

In this work we propose a novel numerical approach to decompose general quantum programs in terms of single- and two-qubit quantum gates with a $CNOT$ gate count very close to the current theoretical lower bounds. In particular, it turns out that $15$ and $63$ $CNOT$ gates are sufficient to decompose a general $3$- and $4$-qubit unitary, respectively, with high numerical accuracy. Our approach is based on a sequential optimization of parameters related to the single-qubit rotation gates involved in a pre-designed quantum circuit used for the decomposition. In addition, the algorithm can be adopted to sparse inter-qubit connectivity architectures provided by current mid-scale quantum computers, needing only a few additional $CNOT$ gates to be implemented in the resulting quantum circuits.

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