More Is Not Necessarily Easier
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In this brief comment, we consider the exact, deterministic, and nonasymptotic transformation of multiple copies of pure states under LOCC. It was conjectured in quant-ph/0103131 that, if $k$ copies of $|ψ\>$ can be transformed to $k$ copies of $|ϕ\>$, the same holds for all $r \geq k$. We present counterexamples to the above conjecture.
One reference corrected
One reference corrected