Curator's Take
AI Commentary
This article shows that a genuine quantum‑gravity signature can survive even when decoherence suppresses entanglement, by exploiting the conditional phase accumulated in a dephased Bose–Marletto–Vedral interferometer. It extends recent BMV‑type proposals into the experimentally realistic strong‑dephasing regime, offering an operational test that distinguishes a quantum Newtonian potential from any passive stochastic classical mediator. While the result hinges on specific assumptions about local‑phase noise models, it gives experimentalists a concrete pathway to probe gravitational coherence with current matter‑wave technology.
— Mark Eatherly
Summary
Whether gravity must be quantum is often approached by asking whether two masses can become entangled through their mutual gravitational interaction. In practice, the weak interaction competes with environmental decoherence, so the final state may contain no entanglement even when the underlying gravitational phase remains coherent. We investigate what can still be learned from the dynamics in a dephased Bose--Marletto--Vedral setup. The dominant Newtonian effect for well-separated paths is an accumulated phase rather than transfer between interferometer arms, a regime motivated by matter-wave gravitational phase experiments and quantified here by wavepacket-overlap and deflection estimates. Keeping independently characterized local which-path dephasing fixed, we prove an exact finite-time distinction between the gravitational conditional-phase evolution and every passive stochastic local-phase model (induced by a classical mediator), including regimes where the chosen input remains separable at all times. The distinction survives, with a modified sensitivity, when the comparison is enlarged to population-preserving classical measurement and feedback through a diagonal PPT relaxation. These results identify an operational test of gravitational phase dynamics in the strong-dephasing regimes, conditional on explicit and physically motivated classical mediator models.