Mass Independent Scheme for Large Spatial Quantum Superpositions

• URL: http://arxiv.org/abs/2210.05689v3
• Date: Thu, 3 Nov 2022 11:08:25 GMT
• Title: Mass Independent Scheme for Large Spatial Quantum Superpositions
• Authors: Run Zhou, Ryan J. Marshman, Sougato Bose, Anupam Mazumdar
• Abstract summary: We present a method of achieving a mass-independent enhancement of superposition via diamagnetic repulsion from current-carrying wires. We analyse an example system which uses the Stern-Gerlach effect to create a small initial splitting, and then apply our diamagnetic repulsion method to enhance the superposition size.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Placing a large mass in a large spatial superposition, such as a Schr\"odinger Cat state is a significant and important challenge. In particular, testing the quantum nature of gravity in the laboratory via entanglement will require a large spatial superposition (${\cal O}(10-100)$ $\mu$m) of a mesoscopic mass ($m\sim {\cal O}(10^{-14} -10^{-15})$ kg). To date, the typical methods of achieving this spatial delocalization are to use wavepacket expansions or quantum ancilla (for example spin) dependent forces, all of whose efficacy reduces with mass. Thus achieving a spatial splitting independent of the mass is an important open challenge. In this paper, we present a method of achieving a mass-independent enhancement of superposition via diamagnetic repulsion from current-carrying wires. We analyse an example system which uses the Stern-Gerlach effect to creating a small initial splitting, and then apply our diamagnetic repulsion method to enhance the superposition size ${\cal O}(400-600)$ $\mu$m from an initial modest split of the wavefunction. We provide an analytic and numeric analysis of our scheme.

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