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This summary is machine-generated.

We developed a new method to assess the nonclassicality of inaccessible quantum systems using quantum discord. This approach monitors entanglement dynamics between two probes interacting with the system, offering robust and experimentally friendly detection of quantum correlations.

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Area of Science:

  • Quantum mechanics
  • Quantum information science
  • Optomechanics

Background:

  • Direct experimentation with some physical objects is challenging.
  • Inferring properties from interactions with controllable systems is desirable.
  • Quantum discord quantifies nonclassical correlations in quantum states.

Purpose of the Study:

  • To introduce schemes for assessing nonclassicality of inaccessible objects via quantum discord.
  • To develop a method robust to open systems and unknown initial states/Hamiltonians.
  • To detect system-environment correlations and environmental nonclassicality.

Main Methods:

  • Utilizing two probes that interact individually with the inaccessible object.
  • Monitoring the entanglement dynamics between the two probes.
  • Applying the scheme to a membrane-in-the-middle optomechanical system.

Main Results:

  • Demonstrated a scheme to infer nonclassicality using probe entanglement.
  • Showcased robustness for open systems, unknown states, and Hamiltonians.
  • Successfully detected system-environment correlations and environmental nonclassicality.

Conclusions:

  • The proposed method provides an experimentally friendly way to assess quantum discord of inaccessible systems.
  • This technique is valuable for understanding open quantum systems and inferring environmental properties.
  • Potential applications include inferring the nonclassical nature of gravity.