Electron spin control of optically levitated nanodiamonds in vacuum.

Nat Commun

Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.

Published: July 2016

Electron spins of diamond nitrogen-vacancy (NV) centres are important quantum resources for nanoscale sensing and quantum information. Combining NV spins with levitated optomechanical resonators will provide a hybrid quantum system for novel applications. Here we optically levitate a nanodiamond and demonstrate electron spin control of its built-in NV centres in low vacuum. We observe that the strength of electron spin resonance (ESR) is enhanced when the air pressure is reduced. To better understand this system, we investigate the effects of trap power and measure the absolute internal temperature of levitated nanodiamonds with ESR after calibration of the strain effect. We also observe that oxygen and helium gases have different effects on both the photoluminescence and the ESR contrast of nanodiamond NV centres, indicating potential applications of NV centres in oxygen gas sensing. Our results pave the way towards a levitated spin-optomechanical system for studying macroscopic quantum mechanics.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4960308PMC
http://dx.doi.org/10.1038/ncomms12250DOI Listing

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