Quantum Mind? Can't Do Without the Classical ⚡ экспресс
The physical requirements for agency are examined: the system's ability to create a model of the world, evaluate the consequences of alternative actions, and reliably perform the action that maximizes expected utility. It is shown that in a purely quantum system (unitary evolution without decoherence and collapse) the first two conditions conflict with the no-cloning theorem: building a model requires copying information from the environment, and deliberation requires copying the model to evaluate different actions. Approximate cloning does not provide sufficient accuracy and generality. The third condition is not fulfilled due to the linearity of quantum dynamics. Implications: agency requires substantial classical resources, which limits its physical basis; the emergence of classical agents in a quantum universe is clarified; quantum computers cannot directly model agentive behavior without significant classical components; quantum theories of agency, free will, and consciousness are challenged.
Intelligent action begins with a plan. Just as an architect needs blueprints to evaluate options, any agent with will needs to repeatedly copy data about reality. But quantum mechanics forbids exact copying of unknown states — the fundamental theorem was discovered by Wojciech Zurek and William Wootters. A purely quantum object cannot preserve a 'snapshot' of its environment, nor compare alternative future scenarios.
You can try to copy approximately, but the quality drops below the level suitable for reliable decisions. Even executing a chosen step is hindered by the linearity of quantum equations: you can't simply single out one outcome from a multitude of superimposed probabilities. An architect in the quantum world is left without a pencil that wouldn't break with every attempt to sketch a blueprint.
The conclusion is striking: reason, will, and goal-directedness require classical 'parts' — they act as a rigid stage with clear boundaries, like spacetime curvature or the speed of light limit, against which the drama of choice unfolds. Most unexpectedly, this no-cloning prohibition is not a bug but a safeguard. It guarantees the inviolability of quantum information, paving the way to absolutely secure communication.
🎯 The no-cloning theorem states: it is impossible to create an exact copy of an arbitrary unknown quantum state. This is not a technical limitation but a fundamental law of nature.
🎬 In science fiction, the idea of quantum consciousness appears frequently (for instance, in Hannu Rajaniemi's novel 'The Quantum Thief'), but new results show that without a classical component, no quantum 'thinking' is possible.