Catapulting towards massive and large spatial quantum superposition

A large spatial quantum superposition of size O(1–10)μm for mass m∼10^{−17}–10^{−14} kg is required to probe the foundations of quantum mechanics and test the classical and quantum nature of gravity via entanglement in a laboratory. In this paper, we will show that it is possible to accelerate the t...

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Veröffentlicht in:Physical review research 2022-12, Vol.4 (4), p.043157, Article 043157
Hauptverfasser: Zhou, Run, Marshman, Ryan J., Bose, Sougato, Mazumdar, Anupam
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Sprache:eng
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Zusammenfassung:A large spatial quantum superposition of size O(1–10)μm for mass m∼10^{−17}–10^{−14} kg is required to probe the foundations of quantum mechanics and test the classical and quantum nature of gravity via entanglement in a laboratory. In this paper, we will show that it is possible to accelerate the two spin states of a macroscopic nanocrystal sourced by the inhomogeneous nonlinear magnetic field in a Stern-Gerlach-type setup. We will assume that the electronic spin can be embedded at the center of the nanocrystal, such as the nitrogen-vacancy (NV) center of diamond. Our analysis will be generic to any dopant or any material. We will show that we can create a desired superposition size within 1–2 s by catapulting the trajectories of the two spin states with a modest magnetic field gradient and then recombine the trajectories for a coherent interference. We will show the demanding nature of the precision required in the magnetic field to recover a 99% spin coherence confidence level at the moment of interference.
ISSN:2643-1564
2643-1564
DOI:10.1103/PhysRevResearch.4.043157