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Catapulting towards massive and large spatial quantum superposition
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DOI：10.1103/PhysRevResearch.4.043157.png)
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Abstract
En 中文
A large spatial quantum superposition of size O(1-10) mu m for mass m similar to 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.
Keywords:
HUMPTY-DUMPTY
STATE
LIMITS
Journal
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4.2
Papers:
7.6K
Citations:
2.7W
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