Gravitationally Induced Entanglement between Two Massive Particles is Sufficient Evidence of Quantum Effects in Gravity.

  title={Gravitationally Induced Entanglement between Two Massive Particles is Sufficient Evidence of Quantum Effects in Gravity.},
  author={Chiara Marletto and Vlatko Vedral},
  journal={Physical review letters},
  volume={119 24},
All existing quantum-gravity proposals are extremely hard to test in practice. Quantum effects in the gravitational field are exceptionally small, unlike those in the electromagnetic field. The fundamental reason is that the gravitational coupling constant is about 43 orders of magnitude smaller than the fine structure constant, which governs light-matter interactions. For example, detecting gravitons-the hypothetical quanta of the gravitational field predicted by certain quantum-gravity… 

Figures from this paper

Observable quantum entanglement due to gravity

No experiment to date has provided evidence for quantum features of the gravitational interaction. Recently proposed tests suggest looking for the generation of quantum entanglement between massive

Two mechanisms for quantum natured gravitons to entangle masses

This paper points out the importance of the quantum nature of the gravitational interaction with matter in a linearized theory of quantum-gravity-induced-entanglement of masses (QGEM). We will show

Gravitational effects in macroscopic quantum systems: a first-principles analysis

We analyze the weak-field limit of general relativity with matter and its possible quantisations. This analysis aims toward a predictive quantum theory to provide a first-principles description of

When can gravity path-entangle two spatially superposed masses?

An experimental test of quantum effects in gravity has recently been proposed, where the ability of the gravitational field to entangle two masses is used as a witness of its quantum nature. The key

A no-go theorem on the nature of the gravitational field beyond quantum theory

Recently, table-top experiments involving massive quantum systems have been proposed to test the interface of quantum theory and gravity. In particular, the crucial point of the debate is whether it

Mechanism for the quantum natured gravitons to entangle masses

This paper points out the importance of the quantum nature of the gravitational interaction with matter in a linearized theory of quantum gravity induced entanglement of masses (QGEM). We will show

The quantum and the gravity: Newtonian and Cosmological applications

The gravitational decoherence field studies the suppression of coherence in quantum systems caused by effects rooted in the gravitational interaction. This models are not just important to yield

Amplification of gravitationally induced entanglement

Observation of gravitationally induced entanglement between two massive particles can be viewed as imply-ing the existence of the nonclassical nature of gravity. However, weak interaction in the

Quantum superposition of two gravitational cat states

We extend our earlier work [] on probing a gravitational cat state (gravcat) to the quantum superposition of two gravcats in an exemplary model and in Bose–Einstein condensates (BEC). In addition to

Constraints on probing quantum coherence to infer gravitational entanglement

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



Spin Entanglement Witness for Quantum Gravity.

It is shown that despite the weakness of gravity, the phase evolution induced by the gravitational interaction of two micron size test masses in adjacent matter-wave interferometers can detectably entangle them even when they are placed far apart enough to keep Casimir-Polder forces at bay.

The Global Approach to Quantum Field Theory

Thanks to its impressive success in the second half of the 20th century, both in high-energy physics and in critical phenomena, quantum field theory has enjoyed an abundant literature. We therefore

The meaning of quantum gravity

1/Quantum Theory and Gravitation.- 2/Quantum Mechanics and Classical Gravitation.- 2.1. Diffraction of Particles by a Grating.- 2.2. Diffraction of Particles by a Gravitational Grating.- 2.3.

Wave–particle duality of C60 molecules

The observation of de Broglie wave interference of C60 molecules by diffraction at a material absorption grating is reported, which is the most massive and complex object in which wave behaviour has been observed.

On Gravity's role in Quantum State Reduction

The stability of a quantum superposition of two different stationary mass distributions is examined, where the perturbing effect of each distribution on the space-time structure is taken into

A classical channel model for gravitational decoherence

We show that, by treating the gravitational interaction between two mechanical resonators as a classical measurement channel, a gravitational decoherence model results that is equivalent to a model

Gravitation and quantum mechanics of macroscopic objects

SummaryThe problem of the reduction of the wave function in quantum theory is treated from a new standpoint. First, by combining Heisenberg's uncertainty relations with gravitation, quantitative limi

Interplay of gravitation and linear superposition of different mass eigenstates

The interplay of gravitation and the quantum-mechanical principle of linear superposition induces a new set of neutrino oscillation phases. These ensure that the flavor-oscillation clocks, inherent

Quantum Entanglement

  • M. Lewenstein
  • Physics, Computer Science
    Do We Really Understand Quantum Mechanics?
  • 2019
A brief overview of the concept of entanglement in quantum mechanics is given, and the major results and open problems related to the recent scientific progress in this field are discussed.