LNE-SYRTE, Observatoire de Paris, Sorbonne Université, PSL Université Paris, CNRS, 61 avenue de l'Observatoire, 75014 Paris, France.
Vienna Center for Quantum science and technology (VCQ), Faculty of Physics, Research Platform TURIS, University of Vienna, A-1090 Vienna, Austria.
Phys Rev Lett. 2018 Jan 26;120(4):043602. doi: 10.1103/PhysRevLett.120.043602.
We propose an experiment to test the weak equivalence principle (WEP) with a test mass consisting of two entangled atoms of different species. In the proposed experiment, a coherent measurement of the differential gravity acceleration between the two atomic species is considered, by entangling two atom interferometers operating on the two species. The entanglement between the two atoms is heralded at the initial beam splitter of the interferometers through the detection of a single photon emitted by either of the atoms, together with the impossibility of distinguishing which atom emitted the photon. In contrast to current and proposed tests of the WEP, our proposal explores the validity of the WEP in a regime where the two particles involved in the differential gravity acceleration measurement are not classically independent, but entangled. We propose an experimental implementation using ^{85}Rb and ^{87}Rb atoms entangled by a vacuum stimulated rapid adiabatic passage protocol implemented in a high-finesse optical cavity. We show that an accuracy below 10^{-7} on the Eötvös parameter can be achieved.
我们提出了一个实验来测试弱等效原理（WEP），使用由两种不同物种的纠缠原子组成的测试质量。在提出的实验中，通过纠缠在两种原子上运行的两个原子干涉仪，考虑对两个原子物种之间的微分重力加速度进行相干测量。两个原子之间的纠缠通过干涉仪初始分束器处检测到的单个光子的发射来预示，同时不可能区分哪个原子发射了光子。与当前和提议的 WEP 测试相比，我们的提议探索了在涉及微分重力加速度测量的两个粒子不是经典独立而是纠缠的情况下 WEP 的有效性。我们提出了一种使用通过在高精细度光学腔中实现的真空受激快速绝热通道协议纠缠的 ^{85}Rb 和 ^{87}Rb 原子的实验实现。我们表明，Eötvös 参数的精度可以低于 10^{-7}。
