Spin dynamical decoupling for generating macroscopic superpositions of a free-falling nanodiamond
arXiv:2105.02105 · doi:10.1103/PhysRevA.105.012824
Abstract
Levitated nanodiamonds containing negatively charged nitrogen-vacancy centers () have been proposed as a platform to generate macroscopic spatial superpositions. Requirements for this include having a long spin coherence time, which necessitates formulating a dynamical decoupling strategy in which the regular spin flips do not cancel the growth of the superposition through the Stern-Gerlach effect in an inhomogeneous magnetic field. Here, we propose a scheme to place a -nm-diameter diamond in a superposition with spatial separation of over nm, while incorporating dynamical decoupling. We achieve this by letting a diamond fall for m through a magnetic structure, including m in an inhomogeneous region generated by magnetic teeth.
arXiv commentVersion 1: 6 pages, 2 figures. Supersedes arXiv:1810.07045 [quant-ph]. Version 2: 11 pages, 5 figures. Removed nanodiamond spin coherence time results as they can now be found in arXiv:2112.01899 [cond-mat.mes-hall]. Added additional details and figures as appendices, and in the discussion section. Version 3: 11 pages, 5 figures. Figures edited to work in grayscale, title change
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