Decoherence of a matter-wave interferometer due to dipole-dipole interactions

Fragolino, Paolo; Schut, Martine; Toroš, Marko; Bose, Sougato; Mazumdar, Anupam

doi:10.1103/physreva.109.033301

Cited by 3 publications

(1 citation statement)

References 60 publications

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“…Creating large spatial superposition states on a macroscopic scale represents a cutting-edge frontier in contemporary quantum research, intersecting theoretical exploration with experimental ingenuity. This pursuit holds significant promise for testing the foundational principles of quantum mechanics in the presence of gravity [1][2][3][4][5], investigating the equivalence principle [6,7], realizing a Crystallized Schrödinger cat states [8][9][10], placing bounds on decoherence mechanisms [11][12][13][14][15][16][17], and exploring applications in quantum sensors [18][19][20], the detection of gravitational waves [19], and the probing of a potential fifth force [21].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Gravito-diamagnetic forces for mass independent large spatial superpositions

Zhou,

Marshman,

Bose

et al. 2024

Phys. Scr.

Self Cite

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Optimal superpositions for particle detection via quantum phase

Kilian,

Toroš,

Barker

et al. 2024

Phys. Rev. Research

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Gravity-induced entanglement between two massive microscopic particles in curved spacetime: II. Friedmann–Lemaître–Robertson–Walker universe

Zhang,

Shu

2024

Eur. Phys. J. C

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In our previous work (Zhang and Shu in Eur Phys J. C 84(3):256, 2024), we have explored quantum gravity induced entanglement of masses (QGEM) in curved spacetime, observing entanglement formation between particles moving along geodesics in a Schwarzschild spacetime background. We find that long interaction time induces entanglement, even for particles with microscopic mass, addressing decoherence concerns. In this work, we build upon our previous work (Zhang and Shu 2024) by extending our investigation to a time-dependent spacetime. Specifically, we explore the entanglement induced by the mutual gravitation of massive particles in the Friedmann–Lemaître–Robertson–Walker (FLRW) universe. With the help of the phase shift and the QGEM spectrum, our proposed scheme offers a potential method for observing the formation of entanglement caused by the quantum gravity of massive particles as they propagate in the FLRW universe. Consequently, it provides insights into the field of entanglement in cosmology.

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Decoherence of a matter-wave interferometer due to dipole-dipole interactions

Cited by 3 publications

References 60 publications

Gravito-diamagnetic forces for mass independent large spatial superpositions

Gravito-diamagnetic forces for mass independent large spatial superpositions

Optimal superpositions for particle detection via quantum phase

Gravity-induced entanglement between two massive microscopic particles in curved spacetime: II. Friedmann–Lemaître–Robertson–Walker universe

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