David A. Meyer,

``Why quantum strategies are quantum mechanical'',

published as ``Meyer replies'',

*Physical Review Letters* **84** (2000) 790.

The relevance of classical models for quantum systems depends upon the
use to which they are put. In the modern context of quantum
information processing, models must scale with the number of qubits,
and be dynamical. Thus, despite the fact that there is a classical
model for a single qubit, since it fails to scale, winning strategies in
PQ P**ENNY** F**LIP**
are quantum mechanical in exactly the way quantum algorithms are.

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This note is a response to a comment of Steven van Enk on ``Quantum strategies''.

Last modified: 27 jan 00.