Realization of a General Three-Qubit Quantum Gate

TL;DR

This paper demonstrates that any three-qubit quantum gate can be implemented efficiently using a specific combination of one-qubit rotations and CNOT gates, improving previous bounds on the number of CNOTs required.

Contribution

It presents a new implementation method for three-qubit gates that reduces the number of CNOT gates needed compared to prior bounds.

Findings

Implementation with at most 98 one-qubit rotations and 40 CNOT gates

Improved bound over previous CNOT gate count

Universal realization of generic three-qubit gates

Abstract

We prove that a generic three-qubit quantum logic gate can be implemented using at most 98 one-qubit rotations about the $y$- and $z$-axes and 40 CNOT gates, beating an earlier bound of 64 CNOT gates.