HYPER and Gravitational Decoherence

Reynaud, Serge; Lamine, Brahim; Lambrecht, Astrid; Neto, Paulo A. Maia; Jaekel, Marc-Thierry

doi:10.1023/b:gerg.0000046183.31629.02

Cited by 20 publications

(22 citation statements)

References 48 publications

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“…Here, we briefly discuss the quantum decoherence due to our local gravitational environment, namely the stochastic background of gravitational waves surrounding the Earth. Details can be found in previously published work [14][15][16][17][18]. First, taking the example of the atomic interferometer HYPER, we show that gravitational waves do not lead to a significant decoherence at the microscopic level.…”

Section: Introductionmentioning

confidence: 72%

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Quantum Decoherence and Gravitational Waves

et al. 2007

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The quite different behaviors exhibited by microscopic and macroscopic systems with respect to quantum interferences suggest the existence of a borderline beyond which quantum systems loose their coherences and can be described classically. Gravitational waves, generated within our galaxy or during the cosmic expansion, constitute a universal environment susceptible to lead to such a quantum decoherence mechanism. We assess this idea by studying the quantum decoherence due to gravitational waves on typical microscopic and macoscopic systems, namely an atom interferometer (HYPER) and the Earth-Moon system. We show that quantum interferences remain unaffected in the former case and that they disappear extremely rapidly in the latter case. We obtain the relevant parameters which, besides the ratio of the system's mass to Planck mass, characterize the loss of quantum coherences.

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Section: Introductionmentioning

confidence: 72%

“…The decoherence factor may be expressed in terms of the variables characterizing the Brownian motion (17) and the distance between the two motions ∆x…”

Section: Quantum Decoherence Of Planetary Systemsmentioning

confidence: 99%

Quantum Decoherence and Gravitational Waves

et al. 2007

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“…These fluctuations satisfy Einstein's equations and as such they are to be identified with transverse-traceless perturbations. The source of these fluctuations may be cosmological 26 (stochastic gravitons produced in the early universe near the big bang or from inflation pre-or post), astrophysical 56 or structural to GR as an emergent theory-see Ref. 57 for an explanation.…”

Section: A Key Ideas and Resultsmentioning

confidence: 99%

Gravitational Decoherence: A Thematic Overview

Anastopoulos¹,

Hu²

2021

Preprint

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Gravitational decoherence (GD) refers to the effects of gravity in actuating the classical appearance of a quantum system. Because the underlying processes involve issues in general relativity (GR), quantum field theory (QFT) and quantum information, GD has fundamental theoretical significance. There is a great variety of GD models, many of them involving physics that diverge from GR and/or QFT. This overview has two specific goals along one central theme: (i) present theories of GD based on GR and QFT and explore their experimental predictions; (ii) place other theories of GD under the scrutiny of GR and QFT, and point out their theoretical differences. We also describe how GD experiments in space in the coming decades can provide evidences at two levels: a) discriminate alternative quantum theories and non-GR theories; b) discern whether gravity is a fundamental or an effective theory.

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“…of astrophysical origin) has been extensively studied e.g. in [12]. The problem of the decoherence induced by spacetime fluctuations is difficult to study as a quantum gravity theory is still missing.…”

Section: Introductionmentioning

confidence: 99%

Dephasing of a non-relativistic quantum particle due to a conformally fluctuating spacetime

Bonifacio¹,

Wang²,

Mendonça³

et al. 2009

Class. Quantum Grav.

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Abstract. We investigate the dephasing suffered by a nonrelativistic quantum particle within a conformally fluctuating spacetime geometry. Starting from a minimally coupled massive Klein-Gordon field, the low velocity limit yields an effective Schrödinger equation where the wave function couples to gravity through an effective nonlinear potential induced by the conformal fluctuations. The quantum evolution is studied through a Dyson expansion scheme up to second order. We show that only the nonlinear part of the potential can induce dephasing. This happens through an exponential decay of the off diagonal terms of the particle density matrix. The bath of conformal radiation is modeled in 3-dimensions and its statistical properties are described in general in terms of a power spectral density. The case of a Lorentz invariant spectral density, allowing to model vacuum fluctuations at a low energy domain, is investigated and a general formula describing the loss of coherence derived. This depends quadratically on the particle mass and on the inverse cube of a typical particle dependent cutoff scale. Finally, the possibilities for experimental verification are discussed. It is shown that current interferometry experiments cannot detect such an effect. However this conclusion may improve by using high mass entangled quantum states.

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HYPER and Gravitational Decoherence

Cited by 20 publications

References 48 publications

Quantum Decoherence and Gravitational Waves

Quantum Decoherence and Gravitational Waves

Gravitational Decoherence: A Thematic Overview

Dephasing of a non-relativistic quantum particle due to a conformally fluctuating spacetime

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