Creating nitrogen–vacancy ensembles in diamond for coupling with flux qubit

doi:10.1088/1674-1056/26/2/020305

Abstract Hybrid quantum system of negatively charged nitrogen-vacancy (NV^-) centers in diamond and superconducting qubits provide the possibility to extend the performances of both systems. In this work, we numerically simulate the coupling strength between NV^- ensembles and superconducting flux qubits and obtain a lower bound of 10¹⁶ cm^-3 for NV^- concentration to achieve a sufficiently strong coupling of 10 MHz when the gap between NV-ensemble and flux qubit is 0. Moreover, we create NV^- ensembles in different types of diamonds by ₁₄N⁺ and ₁₂C⁺ ion implantation, electron irradiation, and high temperature annealing. We obtain an NV^- concentration of 1.05×10¹⁶ cm^-3 in the diamond with 1-ppm nitrogen impurity, which is expected to have a long coherence time for the low nitrogen impurity concentration. This shows a step toward performance improvement of flux qubit-NV^- hybrid system.

Keywords: flux qubit nitrogen-vacancy center hybrid quantum system

Received: 04 November 2016
Revised: 24 November 2016
Accepted manuscript online:

PACS:	03.67.Lx	(Quantum computation architectures and implementations)
	81.05.ug	(Diamond)
	85.25.Cp	(Josephson devices)

Fund: Project supported in part by the National Natural Science Foundation of China (Grant Nos. 91321208, 11574386, 11374344, and 11574380), the National Basic Research Program of China (Grant Nos. 2014CB921401 and 2016YFA0300601), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07010300).

Corresponding Authors: Xin-Yu Pan, Dong-Ning Zheng
E-mail: xbzhu16@ustc.edu.cn;dzheng@iphy.ac.cn

Cite this article:

Ya-Rui Zheng(郑亚锐), Jian Xing(邢健), Yan-Chun Chang(常彦春), Zhi-Guang Yan(闫智广), Hui Deng(邓辉), Yu-Lin Wu(吴玉林), Li Lü(吕力), Xin-Yu Pan(潘新宇), Xiao-Bo Zhu(朱晓波), Dong-Ning Zheng(郑东宁) Creating nitrogen–vacancy ensembles in diamond for coupling with flux qubit 2017 Chin. Phys. B 26 020305

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