Revealing Nonclassicality of Inaccessible Objects

Tanjung Krisnanda, Margherita Zuppardo, Mauro Paternostro, Tomasz Paterek

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39 Citations (Scopus)
211 Downloads (Pure)


Some physical objects are hardly accessible to direct experimentation. It is then desirable to infer their properties based solely on the interactions they have with systems over which we have control. In this spirit, here we introduce schemes for assessing the nonclassicality of the inaccessible objects as characterized by quantum discord. We consider two probes individually interacting with the inaccessible object but not with each other. The schemes are based on monitoring entanglement dynamics between the probes. Our method is robust and experimentally friendly, as it allows the probes and the object to be open systems and makes no assumptions about the initial state, dimensionality of involved Hilbert spaces, and details of the probe-object Hamiltonian. We apply our scheme to a membrane-in-the-middle optomechanical system, to detect system-environment correlations in open system dynamics as well as nonclassicality of the environment, and we foresee potential benefits for the inference of the nonclassical nature of gravity.

Original languageEnglish
Article number120402
Number of pages6
JournalPhysical Review Letters
Issue number12
Publication statusPublished - 21 Sep 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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