Quantum effects in gravity beyond the Newton potential from a delocalised quantum source

• URL: http://arxiv.org/abs/2402.10288v2
• Date: Fri, 2 Aug 2024 17:56:09 GMT
• Title: Quantum effects in gravity beyond the Newton potential from a delocalised quantum source
• Authors: Lin-Qing Chen, Flaminia Giacomini,
• Abstract summary: We show for the first time that gravity is not compatible with a classical description. Experiments such as the generation of gravitationally induced entanglement between two quantum sources of gravity can be explained with the Newton potential.
• Score: 0.9405321764712891
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recent progress in table-top experiments offers the opportunity to show for the first time that gravity is not compatible with a classical description. In all current experimental proposals, such as the generation of gravitationally induced entanglement between two quantum sources of gravity, gravitational effects can be explained with the Newton potential, namely in a regime that is consistent with the weak-field limit of general relativity and does not probe the field nature of gravity. Hence, the Newtonian origin of the effects is a limitation to the conclusions on the nature of gravity that can be drawn from these experiments. Here, we identify two effects that overcome this limitation: they cannot be reproduced using the Newton potential and are independent of graviton emission. First, we show that the interaction between two generic quantum sources of gravity, e.g. in wide Gaussian states, cannot be reproduced with the Newton potential nor with a known classical theory or gravity. Hence, observing the form of this interaction would require either a modification to classical gravity or its quantum description. Second, we show that the quantum commutator between the gravitational field and its canonically conjugate momentum appears as an additional term in the relative phase of a generic quantum source interacting with a test particle. Observing this term in the phase would be a test of the gravitational field as a quantum mediator. Identifying stronger quantum aspects of gravity than those reproducible with the Newton potential is crucial to prove the nonclassicality of the gravitational field and to plan a new generation of experiments testing quantum aspects of gravity in a broader sense than what proposed so far.

Related papers

• Quantum Sensing from Gravity as Universal Dephasing Channel for Qubits [41.96816488439435]
  WeExploit the generic phenomena of the gravitational redshift and Aharonov-Bohm phase. We show that entangled quantum states dephase with a universal rate. We propose qubit-based platforms as quantum sensors for precision gravitometers and mechanical strain gauges.
  arXiv  Detail & Related papers  (2024-06-05T13:36:06Z)
• Table-top nanodiamond interferometer enabling quantum gravity tests [34.82692226532414]
  We present a feasibility study for a table-top nanodiamond-based interferometer. By relying on quantum superpositions of steady massive objects our interferometer may allow exploiting just small-range electromagnetic fields.
  arXiv  Detail & Related papers  (2024-05-31T17:20:59Z)
• Should we necessarily treat masses as localized when analysing tests of quantum gravity? [0.0]
  Recently proposed table-top tests of quantum gravity'' involve creating, separating and recombining superpositions of masses at non-relativistic speeds. Analyses suggest that negligible gravitational radiation is generated if the interference experiments involve sufficiently small accelerations.
  arXiv  Detail & Related papers  (2024-05-30T22:17:08Z)
• Proposal for a Quantum Mechanical Test of Gravity at Millimeter Scale [11.799047242336727]
  We propose a novel experiment that utilizes the Josephson effect to detect the different evolution of quantum phase induced from the potential difference caused by gravity. We demonstrate that this experiment can test gravity quantum mechanically at the millimeter scale, and also has a potential to investigate the parity invariance of gravity at small scales.
  arXiv  Detail & Related papers  (2024-05-25T13:27:28Z)
• Entanglement Dynamics in Quantum Continuous-Variable States [2.480301925841752]
  Gravitation between two quantum masses is one of the most straightforward scenarios where quantum features of gravity could be observed. This thesis introduces general tools to tackle interaction-mediated entanglement and applies them to two particles prepared in continuous-variable states.
  arXiv  Detail & Related papers  (2024-05-12T19:21:21Z)
• Newton's laws of motion can generate gravity-mediated entanglement [0.0]
  Two masses in an initial superposition of spatially localized states are allowed to interact only through gravity. We show that one can generate the same amount of entanglement in this setup by using classical time evolution given by Newton's laws of motion.
  arXiv  Detail & Related papers  (2024-01-15T16:57:15Z)
• Testing Quantum Gravity using Pulsed Optomechanical Systems [13.650870855008112]
  We consider the Schr"odinger-Newton (SN) theory and the Correlated Worldline (CWL) theory, and show that they can be distinguished from conventional quantum mechanics. We find that discriminating between the theories will be very difficult until experimental control over low frequency quantum optomechanical systems is pushed further.
  arXiv  Detail & Related papers  (2023-11-03T17:06:57Z)
• Testing the nonclassicality of gravity with the field of a single delocalized mass [55.2480439325792]
  A setup is proposed that is based on a single delocalized mass coupled to a harmonically trapped test mass. We investigate the in-principle feasibility of such an experiment, which turns out to crucially depend on the ability to tame Casimir-Polder forces.
  arXiv  Detail & Related papers  (2023-07-18T15:40:16Z)
• Entanglement and quantum teleportation under superposed gravitational fields [10.2542434092619]
  The influence of gravitational field on entanglement of bipartite states is investigated based on the recent idea of superposition states of gravitational field. The influence of gravitational field on the transfer of the state through quantum teleportation is also studied.
  arXiv  Detail & Related papers  (2022-10-08T14:16:04Z)
• Inference of gravitational field superposition from quantum measurements [1.7246954941200043]
  In non-relativistic quantum mechanics, the gravitational field in such experiments can be written as a superposition state. We empirically demonstrate that alternative theories of gravity can avoid gravitational superposition states. Proposed experiments with superposed gravitational sources would provide even stronger evidence that gravity is nonclassical.
  arXiv  Detail & Related papers  (2022-09-06T04:37:07Z)
• Is gravitational entanglement evidence for the quantization of spacetime? [0.0]
  Experiments witnessing the entanglement between two particles interacting only via the gravitational field have been proposed as a test whether gravity must be quantized. We present a parametrized model for the gravitational interaction of quantum matter on a classical spacetime, inspired by the de Broglie-Bohm formulation of quantum mechanics.
  arXiv  Detail & Related papers  (2022-05-02T14:37:24Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.