Particle paths can cancel a proposed gravity-entanglement signal
A peer-reviewed theoretical study recalculates proposed gravity-induced entanglement experiments using the complete paths of massive particles. Sections often omitted from simplified calculations can change the predicted phase or make it vanish. Alireza Maleki’s analysis identifies geometry-dependent optima for a fixed path length, while the practical problems of isolating a weak gravitational interaction remain unresolved.
Science··Night
The calculation follows particles along their whole route
Alireza Maleki, a physicist based in Tehran, Iran, examines proposed tests of gravity-induced quantum entanglement in a peer-reviewed theoretical study. He works at the Institute for Research in Fundamental Sciences. Entanglement is a link between quantum states. In the proposals, two massive particles each travel through an interferometer, a device that provides alternative paths. Their gravitational interaction changes the phase used to predict the link. Maleki includes path segments omitted from common simplified calculations.[1]
Wider paths do not continually strengthen the signal
The analysis compares Stern–Gerlach and Mach–Zehnder arrangements while fixing the total path length and assuming constant particle speed. Increasing the distance between alternative paths does not indefinitely increase the useful phase. Intermediate proportions can maximize it, while some geometries make it vanish. In one Mach–Zehnder example, the optimum vertical arm is about one tenth of the total path when the interferometers are separated by one fifth of that length.[1]
Shorter separation brings competing forces into play
The preferred geometry also changes with the separation of the two interferometers. Closer particles have a stronger gravitational interaction, but electromagnetic effects constrain a real apparatus. Other challenges include radiation from heat, encounters with air molecules, nearby masses and vibrations. This single paper supplies analytical design results under its assumptions, with no laboratory detection of gravity-induced entanglement. Its full-trajectory calculation changes the predicted signal before an experiment is built.[1]
