# A simulational model for witnessing quantum effects of gravity using IBM quantum computer Source: [A simulational model for witnessing quantum effects of gravity using IBM quantum computer]() Collection index: [llms.txt]() Data updated: 2025-10-27T04:01:29.203Z Authors: Manabputra, Bikash K. Behera, Prasanta K. Panigrahi Published: 2018-06-26T22:10:04.000Z ## Abstract Witnessing quantum effects in the gravitational field is found to be exceptionally difficult in practice due to lack of empirical evidence. Hence, a debate is going on among physicists whether gravity has a quantum domain or not. There had been no successful experiments at all to show the quantum nature of gravity till two recent independent works by Bose et al. \[Phys. Rev. Lett. 119, 240401 (2017)\] and by Marletto and Vedral \[Phy. Rev. Lett. 119, 240402 (2017)\]. The authors have proposed schemes to test the quantumness of gravity in two small test masses by entangling two spatially separated objects using gravitational interactions. They provide a method to witness the entanglement using spin correlation measurements, which could imply evidence for gravity being a quantum coherent mediator. Here we propose a simulational model by providing a new quantum circuit for verifying the above schemes. We simulate the schemes for the first time in IBM's 5-qubit quantum chip 'ibmqx4' by developing a quantum system which shows effects analogous to quantum gravity and calculates the degree of entanglement of the spin correlation. The entanglement witness over a range is obtained for different experimental parameters. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()