Spectral qudit buses enable swap-free, congestion-free routing of nonlocal gates with 2L+1 primitives instead of 3L for path length L, plus support for Boolean fan-in.
the Lower Bound While the depth lower bound applies to a single non- local operation, the proposed protocol allows multiple operations to proceed simultaneously
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Congestion-free routing on quantum chips
Spectral qudit buses enable swap-free, congestion-free routing of nonlocal gates with 2L+1 primitives instead of 3L for path length L, plus support for Boolean fan-in.