Witnesses of non-classicality for simulated hybrid quantum systems

Abstract

The task of testing whether quantum theory applies to all physical systems and all scales requires considering situations where a quantum probe interacts with another system that need not obey quantum theory in full. Important examples include the cases where a quantum mass probes the gravitational field, for which a unique quantum theory of gravity does not yet exist, or a quantum field, such as light, interacts with a macroscopic system, such as a biological molecule, which may or may not obey unitary quantum theory. In this context a class of experiments has recently been proposed, where the non-classicality of a physical system that need not obey quantum theory (the gravitational field) can be tested indirectly by detecting whether or not the system is capable of entangling two quantum probes. Here we illustrate some of the subtleties of the argument, to do with the role of locality of interactions and of non-classicality, and perform proof-of-principle experiments illustrating the logic of the proposals, using a Nuclear Magnetic Resonance quantum computational platform with four qubits.

arXiv commentRevised and extended

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Cited by in corpus (9)

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• Witnessing non-classicality beyond quantum theory
• Controlling NMR spin systems for quantum computation
• Transforming pure and mixed states using an NMR quantum homogeniser
• Photonic Implementation of Quantum Gravity Simulator
• Gravity as a classical channel and its dissipative generalization
• Massive quantum superpositions using magneto-mechanics
• Dynamics of nonclassicality in a generalized Tavis Cummings model with XY spin $(1/2,1)$ atomic interactions
• Frequency super-resolution with quantum environment engineering in a weakly coupled nuclear-spin system