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A CCCZ gate performed with 6 T gates (2106.11513v1)
Published 22 Jun 2021 in quant-ph
Abstract: We construct a CCCZ gate using six T gates, assisted by stabilizer operations and classical feedback. More generally, we reduce the T cost of a $C{n}Z$ gate from $4n-4$ to $4n-6$, for $n > 2$.
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