Zero-dimensional models for gravitational and scalar QED decoherence

Xu, Qidong; Blencowe, M. P.

doi:10.48550/arxiv.2005.02554

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…There are few quantitative predictions for gravitational decoherence of photons-for a recent toy model with a finite number of degrees of freedom, see, reference [25]. While photons in the optical and ultraviolet spectrum interact much more weakly with gravity than massive particles, it is possible to design quantum optical interference experiments with very long baselines, which could lead to the identification of minute decoherence effects.…”

Section: Introductionmentioning

confidence: 99%

Gravitational decoherence of photons

Lagouvardos¹,

Anastopoulos²

2021

Class. Quantum Grav.

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Models of gravitational decoherence are not commonly applied to ultra-relativistic systems, including photons. As a result, few quantum optical tests of gravitational decoherence have been developed. In this paper, we generalize the gravitational decoherence model of Anastopoulos and Hu (2013 Class. Quantum Grav. 30 165007) to photons. In this model, decoherence originates from a bath of stochastic gravitational perturbations, possibly of fundamental origin. We derive a master equation for general states of the electromagnetic field; the only free parameter is a noise temperature Θ of the gravitational fluctuations. We find that interference experiments with long baselines, accessible in near-future experiments, can, in principle, lead to strong constraints in Θ.

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Section: Introductionmentioning

confidence: 99%

Gravitational decoherence of photons

Lagouvardos¹,

Anastopoulos²

2021

Class. Quantum Grav.

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“…In analogy to what happens with an electromagnetic bath one can expect to have graviton emission, absorption, and scattering processes, all leading to a new channel for the loss of coherence. However, the coupling of the gravitational field to matter presents subtleties, and several different theoretical approaches have been considered [13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Loss of coherence of matter-wave interferometer from fluctuating graviton bath

Toroš¹,

Mazumdar²,

Bose³

2020

Preprint

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In this paper we consider non-relativistic matter-wave interferometer coupled with a quantum graviton bath -and discuss the loss of coherence in the matter sector due to the matter-graviton vertex. First of all, such a process does not lead to any entanglement, but nonetheless the on-shell scattering diagram can lead to loss of coherence as we will show. Importantly, we will show that graviton emission is the only one-vertex Feynman-diagram ∼ √ G which is consistent with the conservation of energy and momentum at the dominant order ∼ O(c −2 ). We will find that the resulting dephasing is extremely mild and hardly places any constraints on matter-wave interferometers in the mesoscopic regime. In particular, the show that the corresponding loss of coherence in the recently proposed experiment which would test quantum aspects of graviton -via entanglement of two matter-wave interferometers -is completely negligible.

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“…Photons move not just through a medium in interstellar communications, but also across the textures of spacetime, requiring consideration of general relativity [27][28][29]. Recent years have also witnessed a growing research interest in how coherence and quantum entanglement was affected in curved spacetime [30][31][32][33][34][35][36][37][38][39][40][41][42][43]. To name a few, the event formalism was proposed to solve the closed timelike curves (CTC) problems, although a recent experiment with the quantum satellite Micius did not support its prediction that time-energy entangled photons would decorrelate after passing through different regions of gravitational potential [30][31][32][33]; a master equation for photons was developed by modeling decoherence arising from a bath of stochastic gravitational disturbances [34,35]; the quantum field theory of light in generally curved spacetime geometry was studied by Exirifard et al and the leading corrections by the Riemann curvature to quantum optics are calculated [36].…”

Section: Introductionmentioning

confidence: 99%

How gravitational fluctuations degrade the high-dimensional spatial entanglement

Wu,

Fan,

Chen

2022

Preprint

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Twisted photons carrying orbital angular momentum (OAM) are competent candidates for future interstellar communications. However, the gravitational fluctuations are ubiquitous in spacetime. Thus a fundamental question arises naturally as to how the gravitational fluctuations affect the coherence and the degree of high-dimensional OAM entanglement when twisted photons travel across the textures of curved spacetime. Here, we consider the covariant scalar Helmholtz equations and the Minkowski metric with fluctuations of Gaussian distribution and formulate analytically the equations describing the motion for twisted light in the Laguerre-Gaussian mode space. It is seen that the OAM cannot remain conserved in the presence of gravitational fluctuations. Furthermore, two-photon density matrices are derived for interstellar OAM quantum entanglement distribution, and the degree of entanglement degradation is characterized by purity and negativity. It is revealed that the higher-dimensional OAM entanglement is more susceptible to spacetime fluctuations. We believe that our findings will be of fundamental importance for the future interstellar quantum communications with twisted photons.

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Zero-dimensional models for gravitational and scalar QED decoherence

Cited by 3 publications

References 2 publications

Gravitational decoherence of photons

Gravitational decoherence of photons

Loss of coherence of matter-wave interferometer from fluctuating graviton bath

How gravitational fluctuations degrade the high-dimensional spatial entanglement

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