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The quantum gravity-induced entanglement of masses (QGEM) protocol for testing quantum gravity using entanglement witnessing utilizes the creation of spatial quantum superpositions of two neutral, massive matter-wave interferometers kept…

Quantum Physics · Physics 2024-03-26 Martine Schut , Andrew Geraci , Sougato Bose , Anupam Mazumdar

To test the quantum nature of gravity in a lab requires witnessing the entanglement between the two test masses (nano-crystals) solely due to the gravitational interaction kept at a distance in a spatial superposition. The protocol is known…

Quantum Physics · Physics 2024-03-26 Martine Schut , Alexey Grinin , Andrew Dana , Sougato Bose , Andrew Geraci , Anupam Mazumdar

Recently a theoretical and an experimental protocol known as quantum gravity induced entanglement of masses (QGEM) has been proposed to test the quantum nature of gravity using two mesoscopic masses each placed in a superposition of two…

Quantum Physics · Physics 2021-11-24 Jules Tilly , Ryan J. Marshman , Anupam Mazumdar , Sougato Bose

Recently a protocol called quantum gravity induced entanglement of masses (QGEM) that aims to test the quantum nature of gravity using the entanglement of 2 qubits was proposed. The entanglement can arise only if the force between the two…

Quantum Physics · Physics 2024-03-26 Martine Schut , Jules Tilly , Ryan J. Marshman , Sougato Bose , Anupam Mazumdar

Evidencing the quantum nature of gravity through the entanglement of two masses has recently been proposed. Proposals using qubits to witness this entanglement can afford to bring two masses close enough so that the complete 1/r interaction…

General Relativity and Quantum Cosmology · Physics 2026-05-27 Bin Yi , Urbasi Sinha , Dipankar Home , Anupam Mazumdar , Sougato Bose

The experiment involving the entanglement of two massive particles through gravitational fields has been devised to discern the quantum attributes of gravity. In this paper, we present a scheme to extend this experiment's applicability to…

General Relativity and Quantum Cosmology · Physics 2024-05-21 Chi Zhang , Fu-Wen Shu

Experimental proposals for testing quantum gravity-induced entanglement of masses (QGEM) typically involve two interacting masses which are each in a spatial superposition state. Here, we propose instead a QGEM experiment with two particles…

Quantum Physics · Physics 2025-12-24 Gerard Higgins , Andrea Di Biagio , Marios Christodoulou

The recently introduced quantum gravity-induced entanglement of masses (QGEM) protocol aims to test the quantum nature of gravity by witnessing the entanglement produced by the virtual exchange of a graviton between two spatially superposed…

Quantum Physics · Physics 2025-07-08 Pablo Guillermo Carmona Rufo , Anupam Mazumdar , Carlos Sabín

Entanglement is a fundamental resource that allows quantum sensors to surpass the standard quantum limit set by the quantum collapse of independent atoms. Collective cavity-QED systems have succeeded in generating large amounts of directly…

Quantum Physics · Physics 2023-03-30 Graham P. Greve , Chengyi Luo , Baochen Wu , James K. Thompson

Recently, there has been a proposal to test the quantum nature of gravity in the laboratory by witnessing the growth of entanglement between two masses in spatial quantum superpositions. The required superpositions can be created via…

Quantum Physics · Physics 2023-12-11 Lorenzo Braccini , Martine Schut , Alessio Serafini , Anupam Mazumdar , Sougato Bose

Utilizing the Stern-Gerlach apparatus to create matter-wave superposition states is a long-sought-after goal, not only due to its potential applications in the quantum realm but also because of its fundamental implications for studying the…

Quantum Physics · Physics 2024-10-28 Qian Xiang , Run Zhou , Sougato Bose , Anupam Mazumdar

It is believed that gravity can be considered as a quantum coherent mediator. In this study, we propose a plan to test the existence of extra dimensions using the Quantum Gravity Induced Entanglement of Masses (QGEM) experiment. This…

General Relativity and Quantum Cosmology · Physics 2024-03-19 Shuai Feng , Bao-Min Gu , Fu-Wen Shu

We use a small atomic Bose-Einstein condensate as an interferometric scanning probe to map out a microwave field near a chip surface with a few micrometers resolution. Using entanglement between the atoms we overcome the standard quantum…

Quantum Physics · Physics 2013-10-30 Caspar F. Ockeloen , Roman Schmied , Max F. Riedel , Philipp Treutlein

In order to detect the quantum nature of gravity, the quantum gravity induced entanglement of masses(QGEM) has been proposed both in flat and curved spacetime. In this paper we propose an analogous QGEM protocol using photons produced in…

General Relativity and Quantum Cosmology · Physics 2025-11-27 Chi Zhang

We investigate the generation rate of quantum gravity induced entanglement of masses(QGEM) in setup with multiple quantum massive particles, among of which only the gravity interaction due to the Newton potential is taken into account. When…

General Relativity and Quantum Cosmology · Physics 2023-03-27 Pan Li , Yi Ling , Zhangping Yu

Quantum entanglement provides a novel way to test short distance physics in the non-relativistic regime. We will provide a protocol to {\it potentially} test new physics by bringing two charged massive particle interferometers adjacent to…

High Energy Physics - Phenomenology · Physics 2022-08-31 Peter F. Barker , Sougato Bose , Ryan J. Marshman , Anupam Mazumdar

The Quantum Gravity Mediated Entanglement (QGEM) protocol offers a novel method to probe the quantumness of gravitational interactions at non-relativistic scales. This protocol leverages the Stern-Gerlach effect to create $\mathcal{O}(\sim…

Finding a feasible scheme for testing the quantum mechanical nature of the gravitational interaction has been attracting an increasing level of attention. Gravity mediated entanglement generation so far appears to be the key ingredient for…

Quantum Physics · Physics 2021-11-09 Onur Hosten

Quantum entanglement, as one of the fundamental concepts in quantum mechanics, has garnered significant attention over the past few decades for its extraordinary nonlocality. With the advancement of quantum technology, quantum entanglement…

Quantum Physics · Physics 2025-11-27 Chi Zhang

All existing quantum gravity proposals share the same deep problem. Their predictions are extremely hard to test in practice. Quantum effects in the gravitational field are exceptionally small, unlike those in the electromagnetic field. The…

Quantum Physics · Physics 2017-12-20 Chiara Marletto , Vlatko Vedral
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