Internal decoherence in nano-object interferometry due to phonons

Henkel, Carsten; Folman, R.

doi:10.1116/5.0080503

Cited by 14 publications

(7 citation statements)

References 78 publications

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“…However, a detailed exploration of these latter aspects will be addressed independently. Additionally, several considerations merit attention, including the coherence of spin in the presence of the NV center [67,68], and the excitations of the phonons [69]. Such considerations are left for future study.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Gravito-diamagnetic forces for mass independent large spatial superpositions

Zhou,

Marshman,

Bose

et al. 2024

Phys. Scr.

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Creating a massive spatial quantum superposition, such as the Schrödinger cat state, where the mass and the superposition size within the range 10-19 - 10-14 kg and Δx ∼ 10 nm - 100 μm, is a challenging task. The methods employed so far rely either on wavepacket expansion or on a quantum ancilla, e.g. single spin dependent forces, which scale inversely with mass. In this paper, we present a novel approach that combines gravitational acceleration and diamagnetic repulsion to generate a large spatial superposition in a relatively short time. After ﬁrst creating a modest initial spatial superposition of 1 µm, achieved through techniques such as the Stern-Gerlach (SG) apparatus, we will show that we can achieve an ∼ 102 - 103 fold improvement to the spatial superposition size (1 µm → 980 µm) between the wave packets in less than 0.02 s by using the Earth’s gravitational acceleration and then the diamagnetic repulsive scattering of the nanocrystal, neither of which depend on the object mass. Finally, the wave packet trajectories can be closed so that spatial interference fringes can be observed. Our ﬁndings highlight the potential of combining gravitational acceleration and diamagnetic repulsion to create and manipulate large spatial superpositions, oﬀering new insights into creating macroscopic quantum superpositions.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Gravito-diamagnetic forces for mass independent large spatial superpositions

Zhou,

Marshman,

Bose

et al. 2024

Phys. Scr.

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“…Approximating the emergence of reality by decoherence seems to deliver similarly but this cannot be the whole story. It can be argued that in a somewhat paradoxical twist objects can theoretically decohere to profoundly non-quantum superpositions of massive bodies [80,86].…”

Section: Discussionmentioning

confidence: 99%

“…This way, there seems to be no basic conflict between Quantum Theory and General Relativity. Nevertheless, this does not mean that massive bodies actually could be in superpositions; this appears to be prevented by inevitable phonons, which would be generated when trying to prepare a superposition of a massive body [80].…”

Section: No Need or Place For Many Worldsmentioning

confidence: 99%

A Heuristic Sketch How It Could Fit All Together With Time

Thomsen

2024

Preprint

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In the light of almost a century of struggle to make (common) sense of Quantum Mechanics and to reconcile it with General Relativity, it is proposed to (for some time) forget about quantizing gravity or striving for one Theory of Everything or “Weltformel”, which would describe the whole of reality without any joints or suture marks. Instead of one single monolithic formalism, a three-legged compound approach is argued for. Quantum Mechanics, Relativity and Thermodynamics are proposed as the main pillars of reality, each with its well-defined realm, specific features, and clearly marked interfaces between the three of them. Not only classical reality, which is rather directly accessible to us, is then comprehensively modelled by their encompassing combination. Quantum phenomena are understood as undoubtedly lying at the bottom of classical physics and at the same time, they become “fully real” only when embedded in classical frames between preparation and measurement in time. It is then where thermodynamics steps in and provides the mediating glue. The aim of this short contribution is not to deliver novel quantitative results but rather to propose a comprehensive research program and to coarsely lay out a very roughly coherent self-referential sketch starting from the beginning of the one universe, which we inhabit.

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“…where g ¼ 2 is the Lande g-factor, μ B ¼ 9 × 10 −24 J=T is the Bohr magneton, m 0 is the mass of the interferometer and ∇B ¼ 10 4 T=m [46,80,81] is the gradient of the magnetic field. The direction of the acceleration a m depends on the gradient of the magnetic field, and the value of the spin in each arm.…”

Section: Noises In the Matter-wave Interferometrymentioning

confidence: 99%

Quantum gravitational sensor for space debris

Toroš

Bose

et al. 2023

Phys. Rev. D

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Matter-wave interferometers have fundamental applications for gravity experiments such as testing the equivalence principle and the quantum nature of gravity. In addition, matter-wave interferometers can be used as quantum sensors to measure the local gravitational acceleration caused by external massive moving objects, thus lending itself for technological applications. In this paper, we will establish a threedimensional model to describe the gravity gradient signal from an external moving object, and theoretically investigate the achievable sensitivities using the matter-wave interferometer based on the Stern-Gerlach setup. As an application we will consider the mesoscopic interference for metric and curvature and gravitational-wave detection scheme [R. J. Marshman et al., Mesoscopic interference for metric and curvature (MIMAC) & gravitational wave detection, New J. Phys. 22, 083012 (2020)] and quantify its sensitivity to gravity gradients using frequency-space analysis. We will consider objects near Earth-based experiments and space debris in proximity of satellites and estimate the minimum detectable mass of the object as a function of their distance, velocity, and orientation.

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Internal decoherence in nano-object interferometry due to phonons

Cited by 14 publications

References 78 publications

Gravito-diamagnetic forces for mass independent large spatial superpositions

Gravito-diamagnetic forces for mass independent large spatial superpositions

A Heuristic Sketch How It Could Fit All Together With Time

Quantum gravitational sensor for space debris

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