Magnetic levitation and spatial superposition of a nanodiamond with a current-carrying chip

• URL: http://arxiv.org/abs/2601.06608v1
• Date: Sat, 10 Jan 2026 16:13:38 GMT
• Title: Magnetic levitation and spatial superposition of a nanodiamond with a current-carrying chip
• Authors: Qian Xiang, Shafaq Gulzar Elahi, Andrew Geraci, Sougato Bose, Anupam Mazumdar,
• Abstract summary: We propose a current-carrying-chip scheme for generating spatial quantum superpositions using a levitating nanodiamond.<n>Our setup is quite versatile and we aim to create the superposition for a mass range of $10-19rm kg m 10-15rm kg$.<n>This setup presents a viable platform for a diamagnetically levitated nanoparticles for a table-top experiment exploring the possibility of creating a macroscopic Schrdinger Cat state.
• Score: 2.8389169321954806
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a current-carrying-chip scheme for generating spatial quantum superpositions using a levitating nanodiamond with a built-in nitrogen-vacancy (NV) centre defect. Our setup is quite versatile and we aim to create the superposition for a mass range of $10^{-19}~{\rm kg}< m< 10^{-15}~{\rm kg}$ and a superposition size ${\cal O}(10) {\rm μm} < Δx < {\cal O}(1){\rm nm}$, respectively, in $t\leq 0.1$s, depending on the position we launch from the center of the diamagnetic trap. We provide an in-depth analysis of two parallel chips that can create levitation and spatial superposition along the $x$-axis, while producing a very tight trap in the $y$ direction, and the direction of gravity, i.e., the $z$ direction. Numerical simulations demonstrate that our setup can create a one-dimensional spatial superposition state along the x-axis. Throughout this process, the particle is stably levitated in the z-direction, and its motion is effectively confined in the y-direction for a Gaussian initial condition. This setup presents a viable platform for a diamagnetically levitated nanoparticle for a table-top experiment exploring the possibility of creating a macroscopic Schrödinger Cat state to test the quantum gravity induced entanglement of masses (QGEM) protocol.

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