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Constructing Nano-Object Quantum Superpositions with a Stern-Gerlach Interferometer

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arxiv 2105.01094 v3 pith:6VIRSKB3 submitted 2021-05-03 quant-ph gr-qc

classification quant-phgr-qc
keywords quantumspatialsuperpositionsalongaspectsclassicalconstrainingconstruct
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abstract

Probing quantum mechanics, quantum aspects of general relativity along with the sensing and the constraining of classical gravity can all be enabled by unprecedented spatial sizes of superpositions of massive objects. In this paper, we show that there is a feasible setup sourced by realizable magnetic field gradients ${\cal O}(10-100)$ Tm$^{-1}$ to construct a large spatial superposition of ${\cal O}(10^{-4}-10^{-8})$ m for masses ${\cal O}(10^{-16}-10^{-14})$ kg over a time period of up to $0.1-10$ seconds.

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  1. Magnetic noise in macroscopic quantum spatial superposition

    quant-ph 2025-04 reject novelty 4.0 of 10

    Magnetic gradient noise in a Stern-Gerlach nanodiamond interferometer sets a current-noise budget of δI/I≈10⁻⁸ for ~100 Hz decoherence, but the Humpty-Dumpty contrast demonstration contains unit and numerical inconsistencies.

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