Environmental gravitational decoherence and a tensor noise model

Suzuki, Fumika; Queißer, Friedemann

doi:10.1088/1742-6596/626/1/012039

Cited by 14 publications

(15 citation statements)

References 17 publications

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“…( 21) is non-zero -as it depends on the value of the vacuum fluctuations, ĝk,λ ĝ † k ,λ , defined in Eq. ( 16) (see also (18)). Eq.…”

Section: Dephasing Due To Graviton Bath -Qft Modelmentioning

confidence: 91%

“…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%

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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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“…( 21) is non-zero -as it depends on the value of the vacuum fluctuations, ĝk,λ ĝ † k ,λ , defined in Eq. ( 16) (see also (18)). Eq.…”

Section: Dephasing Due To Graviton Bath -Qft Modelmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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

Toroš¹,

Mazumdar²,

Bose³

2020

Preprint

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show abstract

“…Remaining within the domain of standard quantum mechanics, the loss of coherence in interference experiments due to the emission of electromagnetic radiation has been already studied in the literature 16 17 . Similarly, the interaction of a massive particle with gravitational waves 18 19 20 and the dephasing effect of time dilation on internal degrees of freedom 21 have been considered as possible origins of quantum decoherence.…”

mentioning

confidence: 99%

Experiments testing macroscopic quantum superpositions must be slow

Mari

Palma

Giovannetti

2016

Sci Rep

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We consider a thought experiment where the preparation of a macroscopically massive or charged particle in a quantum superposition and the associated dynamics of a distant test particle apparently allow for superluminal communication. We give a solution to the paradox which is based on the following fundamental principle: any local experiment, discriminating a coherent superposition from an incoherent statistical mixture, necessarily requires a minimum time proportional to the mass (or charge) of the system. For a charged particle, we consider two examples of such experiments, and show that they are both consistent with the previous limitation. In the first, the measurement requires to accelerate the charge, that can entangle with the emitted photons. In the second, the limitation can be ascribed to the quantum vacuum fluctuations of the electromagnetic field. On the other hand, when applied to massive particles our result provides an indirect evidence for the existence of gravitational vacuum fluctuations and for the possibility of entangling a particle with quantum gravitational radiation.

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“…Decoherence due to dipole or quadrupole moment radiation has been studied in the literature [8,9,10] in the context of quantum field theory. In the literature, dipole moment or quadrupole moment of a composite system consisting of a particle and device (e.g., slit, mirror) which recombines paths of a particle was considered.…”

Section: Introductionmentioning

confidence: 99%

Quantum tunneling of composite object coupled with quantized radiation field

Suzuki

Queißer

2019

Class. Quantum Grav.

Self Cite

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We study quantum tunneling of a composite object, which has a dipole or quadrupole moment coupled with quantized (photon or gravitational) radiation field, through a δ potential barrier. The dipole or quadrupole moment is represented by an oscillator in the relative coordinate of two constituent particles of the object. The center of mass degrees of freedom of the object is not directly coupled with the radiation field. However, we show that, for the object with the oscillator in the excited state, dissipation caused by the radiation field can suppress its quantum tunneling rate in the center of mass degrees of freedom. In addition, when the initial energy of its center of mass motion is similar to that of the excited state of the oscillator, a spatial superposition state of the object prepared by the barrier can decohere due to the radiation field. The main purpose of this article is to investigate how two different interplays (i) among the center of mass, the relative coordinate degrees of freedom and the potential barrier, and (ii) between the relative coordinate degrees of freedom and the radiation field, can affect the quantum tunneling and the creation of the spatial superposition state of the object. Our toy model can give insight into tests of quantum tunneling and quantum superposition of atoms or molecules with its dipole or quadrupole moment coupled with the radiation field.

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Environmental gravitational decoherence and a tensor noise model

Cited by 14 publications

References 17 publications

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

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

Experiments testing macroscopic quantum superpositions must be slow

Quantum tunneling of composite object coupled with quantized radiation field

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