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 PENNY FLIP 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''.