# Large scale quantum entanglement in de Sitter spacetime

@article{Matsumura2017LargeSQ,
title={Large scale quantum entanglement in de Sitter spacetime},
journal={Physical Review D},
year={2017}
}
• Published 26 July 2017
• Physics
• Physical Review D
We investigate quantum entanglement between two symmetric spatial regions in de Sitter space with the Bunch-Davies vacuum. As a discretized model of the scalar field for numerical simulation, we consider a harmonic chain model. Using the coarse-grained variables for the scalar field, it is shown that the multipartite entanglement on the superhorizon scale exists by checking the monogamy relation for the negativity which quantifies the entanglement between the two regions. Further, we consider…
14 Citations

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## References

SHOWING 1-10 OF 28 REFERENCES

### Entanglement entropy in de Sitter space

• Physics
• 2013
A bstractWe compute the entanglement entropy for some quantum field theories on de Sitter space. We consider a superhorizon size spherical surface that divides the spatial slice into two regions,

### Entanglement of Quantum Fluctuations in the Inflationary Universe

We investigate quantum entanglement of a scalar field in the inflationary universe. By introducing a bipartite system using a lattice model of scalar field, we apply the separability criterion based

### Entanglement negativity in the multiverse

• Physics
• 2014
We explore quantum entanglement between two causally disconnected regions in the multiverse. We first consider a free massive scalar field, and compute the entanglement negativity between two

### Impact of quantum entanglement on spectrum of cosmological fluctuations

We investigate the effect of entanglement between two causally separated open charts in de Sitter space on the spectrum of vacuum fluctuations. We consider a free massive scalar field, and construct

### Entanglement renormalization.

• G. Vidal
• Physics
Physical review letters
• 2007
Numerical simulations with the ground state of a 1D lattice at criticality show that the resulting coarse-grained sites require a Hilbert space dimension that does not grow with successive RG transformations, and calculations unveil that ground state entanglement in extended quantum systems is organized in layers corresponding to different length scales.

### Critical and noncritical long-range entanglement in Klein-Gordon fields

• Physics
• 2009
We investigate the entanglement between two spatially separated intervals in the vacuum state of a free one-dimensional Klein-Gordon field by means of explicit computations in the continuum limit of

### Classical and Quantum Correlations of Scalar Field in the Inflationary Universe

• Physics
• 2011
We investigate classical and quantum correlations of a quantum field in the inflationary universe using a particle detector model. By considering the entanglement and correlations between two

### Entanglement and separability of quantum harmonic oscillator systems at finite temperature

• Physics
Quantum Inf. Comput.
• 2008
It is proved that at sufficiently high temperatures the thermal state becomes fully separable and bounds on the critical temperature at which this happens are deduced, and the bound becomes tight for a wide class of Hamiltonians with sufficient translation symmetry.

### Separability for lattice systems at high temperature

Equilibrium states of infinite extended lattice systems at high temperature are studied with respect to their entanglement. Two notions of separability are offered. They coincide for finite systems