How to avoid the appearance of a classical world in gravity experiments

Aspelmeyer, Markus

doi:10.48550/arxiv.2203.05587

Cited by 3 publications

(7 citation statements)

References 60 publications

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“…For the source, we start by setting R = 10 µm, corresponding to a mass of 10 −11 kg for a density of 2600 kg/m 3 . This value for the mass of the source is similar the estimate of the other proposals [18,19,31], and is indeed mid-way in magnitude between the values cited in the introduction for current detection of gravity and of quantum effects.…”

Section: E Summary: a Feasibility Regionsupporting

confidence: 85%

“…Next, we discuss the localisation of the source by decoherence, the obstacle that we aim to defeat by employing the Zeno effect. Here, we will follow Joos and Zeh's treatment of decoherence [31,60,61]. The evolution equation is…”

Section: B Decoherencementioning

confidence: 99%

“…In our study we take into account two unavoidable sources of decoherence: the interaction with rest gas, and blackbody radiation. Next we distill the useful information from [31,61]. We do not address the decoherence due to displacement and frequency noise in the trapping potential [62,63], as this will depend on the exact set-up used to prepare the Zeno-frozen source, which we have decided to leave for future work.…”

Section: B Decoherencementioning

confidence: 99%

“…In all the existing proposals, the main obstacle is decoherence [31]. Indeed, the more delocalised a system is, the more likely it is that the environment correlates with the position and destroys the coherent superposition.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the possibility of detecting gravity of an object frozen in a spatial superposition by the Zeno effect

Sidajaya¹,

Wei²,

Scarani³

2022

Preprint

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While quantum probes surely feel gravity, no source of gravity has been prepared in a delocalised quantum state yet. Two basic questions need to be addressed: how to delocalise a mass sufficiently large to generate detectable gravity; and, once that state has been prepared, how to fight localisation by decoherence. We propose to fight decoherence by freezing the source in the desired state through the Zeno effect. Successful implementation can be verified by scattering a probe in the effective potential generated by the source. Besides putting forward the idea, we provide a first estimation of the values of the parameters required for the proposal to be feasible. Overall, the proposal seems as challenging as other existing ones, although the specific challenges are different (e.g. no entanglement needs to be preserved or detected, but the Zeno freezing must be implemented).

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Section: E Summary: a Feasibility Regionsupporting

confidence: 85%

Section: B Decoherencementioning

confidence: 99%

Section: B Decoherencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the possibility of detecting gravity of an object frozen in a spatial superposition by the Zeno effect

Sidajaya¹,

Wei²,

Scarani³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The theory of general relativity [1][2][3] describes gravitation at macroscopic, astrophysical and cosmological scales but in principle it could be applicable to other scales like the atomic world were it not for the fact that gravity intensity is negligible at those scales. In fact, we do not have reliable evidence of gravitation below the micron scale [4][5][6]. This tension between quantum and gravitation manifests not only in fundamental physics, but also in the basic system of units SI [7].…”

Section: Introductionmentioning

confidence: 79%

Is the Majorana bound state a gravitationally neutral system?

Martín-Delgado¹

2023

Preprint

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An argument is provided that confronts the strong equivalence principle (SEP) of general relativity with the superposition principle (SP) of quantum mechanics. The result has implications on the possibility of synthesizing Majorana bound states in 1D systems or the possible violation of the strong equivalence principle by quantum effects. The argument is formulated by inducing a very special fine tuning of coupling constants in the Kitaev Hamiltonian representing 1D topological superconductors.

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Conditions for Graviton Emission in the Recombination of a Delocalized Mass

Pesci

2023

Quantum Reports

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In a known gedanken experiment, a delocalized mass is recombined while the gravitational field sourced by it is probed by another (distant) particle; in it, this is used to explore a possible tension between complementarity and causality in case the gravitational field entangles with the superposed locations, a proposed resolution being graviton emission from quadrupole moments. Here, we focus on the delocalized particle (forgetting about the probe and the gedanken experiment) and explore the conditions (in terms of mass, separation, and recombination time) for graviton emission. Through this, we find that the variations of quadrupole moments in the recombination are generically greatly enhanced if the field is entangled compared to if it is sourced instead by the energy momentum expectation value on the delocalized state (moment variation ∼md2 in the latter case, with m mass, d separation). In addition, we obtain the (upper) limit recombination time for graviton emission growing as m in place of the naive expectation m. In this, the Planck mass acts as threshold mass (huge, for delocalized objects): no graviton emission is possible below it, however fast the recombination occurs. If this is compared with the decay times foreseen in the collapse models of Diósi and Penrose (in their basic form), one finds that no (quadrupole) graviton emission from recombination is possible in them. Indeed, right when m becomes large enough to allow for emission, it also becomes too large for the superposition to survive collapse long enough to recombine.

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How to avoid the appearance of a classical world in gravity experiments

Cited by 3 publications

References 60 publications

On the possibility of detecting gravity of an object frozen in a spatial superposition by the Zeno effect

On the possibility of detecting gravity of an object frozen in a spatial superposition by the Zeno effect

Is the Majorana bound state a gravitationally neutral system?

Conditions for Graviton Emission in the Recombination of a Delocalized Mass

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