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Complementarity in variable strength quantum non-demolition measurements

Abstract : Using a linear optic quantum gate we perform a variable strength quantum non-demolition measurement, to elucidate the role of which-path knowledge in a complementarity experiment. Specifically, we demonstrate that the entanglement created by the measurement interaction prevents an exhaustive description in terms of complementary wave-like and particle-like behaviour of a single photon in an interferometer.
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Marco Barbieri, M.E. Goggin, M.P. Almeida, B.P. Lanyon, A.G. White. Complementarity in variable strength quantum non-demolition measurements. New Journal of Physics, Institute of Physics: Open Access Journals, 2009, 11, pp.093012. ⟨10.1088/1367-2630/11/9/093012⟩. ⟨hal-00569531⟩

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