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This study demonstrates that gravitational coupling can significantly enhance collective coherence in massive quantum systems, offering a refined framework for understanding quantum resilience beyond temperature thresholds. By decomposing total coherence into collective and localized components, the research provides new metrics using Bures distance and quantum Jensen-Shannon divergence to analyze stability against thermal fluctuations. These findings advance the theoretical foundations required for developing macroscopic quantum technologies and probing quantum gravity.

Sursă care acoperăQuantum Zeitgeist

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Hassan II University Team Maps Coherence in Gravitational Cat States

Quantum Zeitgeist28 august 20264 min de cititArticolul și perspectiva sunt în engleză.

Increasing the gravitational coupling between particles preferentially enhances collective coherence, a finding that refines understanding of quantum resilience in massive systems. Unlike previous work establishing temperature thresholds for entanglement, this decomposition distinguishes between coherence arising from particle correlations and that intrinsic to each particle. This nuanced view may aid both the search for quantum gravity and the development of quantum technologies.

Particles confined in a double-well potential and coupled through their mutual Newtonian gravitational interaction have been investigated by Mostafa Mansour and Mansoura Oumennana of the Hassan II University. Non-classical correlations are characterised using Bures distance of entanglement and quantum discord. Coherence is quantified through the square root of the quantum Jensen-Shannon divergence (QJSD) from the maximally mixed state, yielding a measure invariant under arbitrary unitary transformations…

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