Optically coherent nitrogen-vacancy defect centers in diamond nanostructures

Abstract

Optically active solid-state spin defects have the potential to become a versatile resource for quantum information processing applications. Nitrogen-vacancy defect centers (NV) in diamond act as quantum memories and can be interfaced by coherent photons as demonstrated in entanglement protocols. However, in particular in diamond nanostructures, the effect of spectral diffusion leads to optical decoherence hindering entanglement generation. In this work, we present strategies to significantly reduce the electric noise in diamond nanostructures. We demonstrate single NVs in nanopillars exhibiting lifetime-limited linewidth on the time scale of one second and long-term spectral stability with inhomogeneous linewidth as low as 150 MHz over three minutes. Excitation power and energy-dependent measurements in combination with nanoscopic Monte Carlo simulations contribute to a better understanding of the impact of bulk and surface defects on the NV's spectral properties. Finally, we propose an entanglement protocol for nanostructure-coupled NVs providing entanglement generation rates up to hundreds of kHz.

Main part: 13 pages, 5 figures

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• Diamond optomechanical cavity with a color center for microwave-to-optical quantum interfaces
• Scanning cavity microscopy of a single-crystal diamond membrane
• Efficient Microwave Spin Control of Negatively Charged Group-IV Color Centers in Diamond
• Laser-induced spectral diffusion of T centers in silicon nanophotonic devices
• Entanglement generation using single-photon pulse reflection in realistic networks
• Scalable registration of single quantum emitters within solid immersion lenses through femtosecond laser writing
• Wideband covariance magnetometry below the diffraction limit
• Optically Coherent Nitrogen-Vacancy Centers in HPHT Treated Diamonds
• Wavelet-based Ramsey magnetometry enhancement of a single NV center in diamond
• Optical Switching of ${\chi }^{(2)}$ in Diamond Photonics
• Optical probing of phononic properties of a tin-vacancy color center in diamond