[Worldtraveler once upon a time]

"An artist's impression of the experiment. (University of Southampton)" --- "Now we have successfully measured gravitational signals at the smallest mass ever recorded, it means we are one step closer to finally realizing how it works in tandem."

Graphics and statement translation: Please send more money.

Because, from the Abstract, "we do not know what happens to gravity in the microscopic regime where quantum effects dominate and whether quantum coherent effects of gravity become apparent."

The observer effect was not discussed in the paper. Yet quantum theory specifically posits the observers changes the reality. From the Weizmann Institute experiment so long ago, "the greater the amount of 'watching,' the greater the observer's influence on what actually takes place."

Best wishes, with the thanks for posting.

[muir_redwoods]

To be fair, it doesn’t sound like a very costly experiment.