Temperature dependent coherence properties of NV ensemble in diamond up to 600K

• URL: http://arxiv.org/abs/2102.12790v1
• Date: Thu, 25 Feb 2021 11:21:50 GMT
• Title: Temperature dependent coherence properties of NV ensemble in diamond up to 600K
• Authors: Shengran Lin, Changfeng Weng, Yuanjie Yang, Jiaxin Zhao, Yuhang Guo, Jian Zhang, Liren Lou, Wei Zhu, and Guanzhong Wang
• Abstract summary: Nitrogen-vacancy center in diamond is an ideal candidate for quantum sensors. Coherence properties of the NV center ensemble are studied at temperatures from 300 K to 600 K.
• Score: 7.440711168511039
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Nitrogen-vacancy (NV) center in diamond is an ideal candidate for quantum sensors because of its excellent optical and coherence property. However, previous studies are usually conducted at low or room temperature. The lack of full knowledge of coherence properties of the NV center at high temperature limits NV's further applications. Here, we systematically explore the coherence properties of the NV center ensemble at temperatures from 300 K to 600 K. Coherence time $T_2$ decreases rapidly from $184 \mu s$ at 300 K to $30 \mu s$ at 600 K, which is attributed to the interaction with paramagnetic impurities. Single-quantum and double-quantum relaxation rates show an obvious temperature-dependent behavior as well, and both of them are dominated by the two phonon Raman process. While the inhomogeneous dephasing time $T_2^*$ and thermal echo decoherence time $T_{TE}$ remain almost unchanged as temperature rises. Since $T_{TE}$ changed slightly as temperature rises, a thermal-echo-based thermometer is demonstrated to have a sensitivity of $41 mK/\sqrt{Hz}$ at 450 K. These findings will help to pave the way toward NV-based high-temperature sensing, as well as to have a more comprehensive understanding of the origin of decoherence in the solid-state qubit.

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