David A. Meyer,
``On the absence of homogeneous scalar unitary cellular automata'',
Physics Letters A 223 (1996) 337-340,
quant-ph/9604011.

Failure to find homogeneous scalar unitary cellular automata (CA) in one dimension led to consideration of only ``approximately unitary'' CA---which motivated our recent proof of a No-go Lemma in one dimension. In this note we extend the one dimensional result to prove the absence of nontrivial homogeneous scalar unitary CA on Euclidean lattices in any dimension.

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