Saki Tanaka, Naoki Yamamoto
This paper reconsiders the method of adaptive measurement for qubit state preparation developed by Jacobs and shows an alternative scheme that works even under unknown unitary evolution of the state. The key idea is the use of quantum Zeno effect; i.e. the measurement is adaptively changed so that the state is dynamically frozen in one of the eigenstates of the measured observable while that eigenstate approaches to the target state. Numerical simulations demonstrate that this adaptive Zeno measurement scheme offers faster and more stable convergence of the state into the target as well as higher robustness against the uncertainty of the unitary evolution, than the case of Jacobs' scheme.
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http://arxiv.org/abs/1208.4197
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