In the curved spacetime of a Garfinkle–Horowitz–Strominger black hole, quantum resources behave in opposite ways: local coherence is enhanced, while the nonlocal entanglement of Dirac fields is suppressed. This was shown by a preprint published on arXiv on 9 September 2026.
A group of physicists from China — Zejun Wang, Zhihong Liu, Yu-Xuan Wang and Xiao-Li Huang — studied the influence of the GHS dilatonic black hole on the quantum resources of Dirac fields beyond the single-mode approximation. They used negativity to measure entanglement and the l1-norm together with relative entropy of coherence to assess superposition. As the dilatonic parameter increased, entanglement decreased continuously, leaving only a finite residual in the strong-gravity regime, whereas coherence, by contrast, increased.
It is especially noteworthy that a maximally entangled initial state does not always retain the greatest negativity after passing through GHS spacetime. Under certain conditions, some less entangled states retained the connection more strongly. This shows that gravity affects local and nonlocal quantum resources differently.
Imagine two particles as dancers: coherence is the precision of one dancer's individual spin, while entanglement is the synchrony of movements across a great distance. Curved space enhances individual precision but throws off the pair's shared rhythm.
The results presented in the preprint arXiv:2609.10624 open a new perspective on the protection of quantum resources under relativistic conditions. They may help in developing quantum information protocols resistant to gravitational effects and deepen understanding of how the curvature of spacetime separates local and nonlocal correlations.
Thus, dilatonic gravity does not merely distort quantum states but selectively redistributes their resources, leaving open the question of the practical use of this effect in the future.
