Matter and spin superposition in vacuum experiment (MASSIVE)
arXiv:1810.07045
Abstract
A free-falling nanodiamond containing a nitrogen vacancy centre in a spin superposition should experience a superposition of forces in an inhomogeneous magnetic field. We propose a practical design that brings the internal temperature of the diamond to under 10 K. This extends the expected spin coherence time from 2 ms to 500 ms, so the spatial superposition distance could be increased from 0.05 nm to over 1 m, for a 1 m diameter diamond and a magnetic inhomogeneity of only 10 T/m. The low temperature allows single-shot spin readout, reducing the number of nanodiamonds that need to be dropped by a factor of 10,000. We also propose solutions to a generic obstacle that would prevent such macroscopic superpositions.
6 pages, 1 figure
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- Signatures of the quantum nature of gravity in the differential motion of two masses
- Mesoscopic Interference for Metric and Curvature (MIMAC) & Gravitational Wave Detection
- On quantum superpositions of graphs, no-signalling and covariance
- Quantum networks theory
- Towards a test of quantum gravity with a levitated nanodiamond containing a spin