Preprint
Aug 2026
Quantum Circuit for General Unitary: Improved T-count via Block Flattening and Dilation
A Clifford+T quantum circuit construction that approximately implements any classically specified unitary to within error $\epsilon$ and achieves a worst-case $T$-count with leading exponential scaling of $2^{5n/4}$ whenever $\log(1/\epsilon)=\operatorname{poly}(n)$.
Pei Yuan, Shengyu Zhang, Wei Zi
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