Decoherence and the conditions for the classical control of quantum systems

Details Decoherence and the conditions for the classical control of quantum systems Decoherence and the conditions for the classical control of quantum systems

2012-01-24

arxiv.org/abs/1201.5111v1

Physics

Quantum Physics

Scientific paper

We find the conditions for one quantum system to function as a classical controller of another quantum system: the controller must be an open system and rapidly diagonalised in the basis of the controller variable that is coupled to the controlled system. This causes decoherence in the controlled system that can be made small if the rate of diagonalisation is fast. We give a detailed example based on the quantum optomechanical control of a mechanical resonator. The resulting equations are similar in structure to recently proposed models for consistently combining quantum and classical stochastic dynamics.

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