A field, which mediates entanglement between two quantum systems, must be of quantum nature. Attempts to witness this way quantumlike features of the gravitational field with tabletop experiments are actively studied recently, in particular by considering to look at two masses in a superposition in two locations, each in one interferometer. Entanglement intervention is probed when the interferometers are put side by side. If the masses interact only via Newtonian attraction, and still some degree of entanglement is found, than the gravitational field must be quantum like, or at least non-classical. The masses considered are mesoscopic, 10^–14 Kg to 10^–12 Kg, and in one proposal Mach–Zehnder interferometry is considered. Liquid He⁴ is superfluid below 2.17 K, and shows macroscopic quantum behaviour, in particular matter interferometry, as in the Superfluid He Quantum Inteference Device—SHeQUID. With its Josephson junctions as slits, the SHeQUID parallels a Mach–Zehnder. In this case the matter quantities involved are macroscopic, 10^–8 Kg. We propose and analize the feasibility of a scheme on the lines of the above, where the matter field is given by superfluid He⁴, and the Mach–Zehnder’s are two SHeQUID, put side by side. We find that the proposed experiment is feasible, using only well demonstrated methods and technologies, with no need to extensions beyond the current frontiers.

介导两个量子系统之间纠缠的场必须具有量子性质。最近，人们正在积极研究通过桌面实验以这种方式见证引力场的类似量子特征的尝试，特别是通过考虑在两个位置叠加的两个质量，每个质量都在一个干涉仪中。当干涉仪并排放置时，会探测到纠缠干涉。如果质量仅通过牛顿引力相互作用，并且仍然存在某种程度的纠缠，那么引力场一定是量子态的，或者至少是非经典的。考虑的质量是细观的， 10 – ¹⁴ Kg 到 10 ^–12 Kg，并且在一项提案中考虑了马赫-曾德干涉测量法。液体他⁴是低于 2.17 K 的超流体，并显示宏观量子行为，特别是物质干涉测量，如超流体 He 量子干涉装置 - SHeQUID。SHeQUID 以其约瑟夫森结作为狭缝，平行于马赫-曾德尔。在这种情况下，所涉及的物质数量是宏观的，10 ^–8 Kg。我们提出并分析了上述方案的可行性，其中物质场由超流体 He ⁴给出，而 Mach-Zehnder 是两个并排放置的 SHeQUID。我们发现所提出的实验是可行的，只使用经过充分证明的方法和技术，不需要扩展到当前的前沿。