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 Unavoidable decoherence in the quantum control of an unknown state


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A common objective for quantum control is to force a quantum system, initially in an unknown state, into a particular target subspace. We show that if the subspace is required to be a decoherence-free subspace of dimension greater than 1, then such control must be decoherent. That is, it will take almost any pure state to a mixed state. We make no assumptions about the control mechanism, but our result implies that for this purpose coherent control offers no advantage, in principle, over the obvious measurement-based feedback protocol.



Author: D. Kielpinski; R. A. Briggs; H. M. Wiseman

Source: https://archive.org/



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