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The quantum superposition principle states that an entity can exist in twodifferent states simultaneously, counter to our 'classical' intuition. Is itpossible to understand a given system's behaviour without such a concept? Atest designed by Leggett and Garg can rule out this possibility. The test,originally intended for macroscopic objects, has been implemented in varioussystems. However to-date no experiment has employed the 'ideal negative result'measurements that are required for the most robust test. Here we introduce ageneral protocol for these special measurements using an ancillary system whichacts as a local measuring device but which need not be perfectly prepared. Wereport an experimental realisation using spin-bearing phosphorus impurities insilicon. The results demonstrate the necessity of a non-classical picture forthis class of microscopic system. Our procedure can be applied to systems ofany size, whether individually controlled or in a spatial ensemble.

Violation of a Leggett-Garg inequality with ideal non-invasive measurements