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arXiv · 1904.00883

Optically coherent nitrogen-vacancy centers in μm-thin etched diamond membranes

Maximilian Ruf·Mark IJspeert·Suzanne van Dam·Nick de Jong·Hans van den Berg·Guus Evers·Ronald Hanson
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Abstract

Diamond membrane devices containing optically coherent nitrogen-vacancy (NV) centers are key to enable novel cryogenic experiments such as optical ground-state cooling of hybrid spin-mechanical systems and efficient entanglement distribution in quantum networks. Here, we report on the fabrication of a (3.4 $\pm$ 0.2) μm thin, smooth (surface roughness r$_q$ < 0.4 nm over an area of 20 μm by 30 μm diamond membrane containing individually resolvable, narrow linewidth (< 100 MHz) NV centers. We fabricate this sample via a combination of high energy electron irradiation, high temperature annealing, and an optimized etching sequence found via a systematic study of the diamond surface evolution on the microscopic level in different etch chemistries. While our particular device dimensions are optimized for cavity-enhanced entanglement generation between distant NV centers in open, tuneable micro-cavities, our results have implications for a broad range of quantum experiments that require the combination of narrow optical transitions and μm-scale device geometry.

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Maximilian Ruf, Mark IJspeert, Suzanne van Dam, Nick de Jong, Hans van den Berg, Guus Evers, Ronald Hanson. 2019-04-01. Optically coherent nitrogen-vacancy centers in μm-thin etched diamond membranes. https://doi.org/10.1021/acs.nanolett.9b01316

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