Zhou, R;
Marshman, RJ;
Bose, S;
Mazumdar, A;
(2022)
Catapulting towards massive and large spatial quantum superposition.
Physical Review Research
, 4
(4)
, Article 043157. 10.1103/PhysRevResearch.4.043157.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Catapulting towards massive and large spatial quantum superposition |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevResearch.4.043157 |
| Publisher version: | https://doi.org/10.1103/PhysRevResearch.4.043157 |
| Language: | English |
| Additional information: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10163240 |
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