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Title: Violation of a Leggett-Garg inequality with ideal non-invasive measurements
Authors: Knee, G.C.
Simmons, S.
Gauger, E.M.
Morton, J.J.L.
Riemann, H.
Abrosimov, N.V.
Becker, P.
Pohl, H.-J.
Itoh, K.M.
Thewalt, M.L.W.
Briggs, G.A.D.
Benjamin, S.C. 
Issue Date: 2012
Citation: Knee, G.C., Simmons, S., Gauger, E.M., Morton, J.J.L., Riemann, H., Abrosimov, N.V., Becker, P., Pohl, H.-J., Itoh, K.M., Thewalt, M.L.W., Briggs, G.A.D., Benjamin, S.C. (2012). Violation of a Leggett-Garg inequality with ideal non-invasive measurements. Nature Communications 3 : -. ScholarBank@NUS Repository.
Abstract: The quantum superposition principle states that an entity can exist in two different states simultaneously, counter to our 'classical' intuition. Is it possible to understand a given system's behaviour without such a concept? A test designed by Leggett and Garg can rule out this possibility. The test, originally intended for macroscopic objects, has been implemented in various systems. However to date no experiment has employed the 'ideal negative result' measurements that are required for the most robust test. Here we introduce a general protocol for these special measurements using an ancillary system, which acts as a local measuring device but which need not be perfectly prepared. We report an experimental realization using spin-bearing phosphorus impurities in silicon. The results demonstrate the necessity of a non-classical picture for this class of microscopic system. Our procedure can be applied to systems of any size, whether individually controlled or in a spatial ensemble. © 2012 Macmillan Publishers Limited. All rights reserved.
Source Title: Nature Communications
ISSN: 20411723
DOI: 10.1038/ncomms1614
Appears in Collections:Staff Publications

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