标题： 强非相干引力 显示英文标题

标题： Strongly incoherent gravity

摘要： 虽然自然界中大多数基本相互作用已知是由量子场介导的，但有观点提出引力可能表现不同。 使这一概念足够精确以进行测试需要一致的模型。 在这里，我们构建了一个理论的明确例子，其中任意两体势 $V(r)$ 的非纠缠版本来源于局部测量和反馈力。 虽然存在多种此类理论，但与更微妙的方法相比，我们的构造导致了特别强的退相干。 无论如何，可观测量的期望值遵循通常的经典动力学，而相互作用不会产生纠缠。 应用于牛顿势，这会产生一个非相对论性的引力模型，具有基本的幺正性损失。 该模型包含一对自由参数，其中相当大的范围目前未被观测所排除。 作为测试纠缠性质的替代方法，我们表明可以通过观察像原子干涉仪这样的小系统与振荡源质量耦合时量子相干性的损失来测试整个剩余参数空间。 显示英文摘要

摘要： While most fundamental interactions in nature are known to be mediated by quantized fields, the possibility has been raised that gravity may behave differently. Making this concept precise enough to test requires consistent models. Here we construct an explicit example of a theory where a non-entangling version of an arbitrary two-body potential $V(r)$ arises from local measurements and feedback forces. While a variety of such theories exist, our construction causes particularly strong decoherence compared to more subtle approaches. Regardless, expectation values of observables obey the usual classical dynamics, while the interaction generates no entanglement. Applied to the Newtonian potential, this produces a non-relativistic model of gravity with fundamental loss of unitarity. The model contains a pair of free parameters, a substantial range of which is not excluded by observations to date. As an alternative to testing entanglement properties, we show that the entire remaining parameter space can be tested by looking for loss of quantum coherence in small systems like atom interferometers coupled to oscillating source masses.