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Annals of Physics

Resonance fluorescence and quantum interference of a single NV center

Yonghong Ma, Xuefeng Zhang, E. Wu

Published Aug 25, 2017• 4 citations
Publisher
DOI
10.1016/j.aop.2017.08.013

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We report on the observation of quantum interference of the emission from two separate nitrogen vacancy (NV) centers in diamond. Taking advantage of optically induced spin polarization in combination with polarization filtering, we isolate a single transition within the zero-phonon line of the nonresonantly excited NV centers. The time-resolved two-photon interference contrast of this filtered emission reaches 66%. Furthermore, we observe quantum interference from dissimilar NV centers tuned into resonance through the dc Stark effect. These results pave the way towards measurement-based entanglement between remote NV centers and the realization of quantum networks with solid-state spins.
Single nitrogen vacancy (NV) centers in diamond serve as a photonic platform for quantum sensing and computing applications. They can be created deterministically using femtosecond laser pulses. Such writing process requires high-resolution fluorescence detection with a high signal-to-noise ratio, which is accomplished by setting up a homebuilt confocal fluorescence microscope. The microscope shall monitor the fluorescence of newly formed NV centers during the writing process. In addition, it will be used to characterize the NV centers’ spin coherence times, orientation in the diamond lattice and single-emitter characteristics via the intensity correlation function g(2)(tau). In the future, this setup is also planned to be employed for STED-microscopy of twin NV centers.
Laser-induced fluorescence quenching in nitrogen-vacancy (NV) centers in diamond is studied simultaneously with in situ measurements of the heating-induced shift of the electron spin resonance of NV centers in the presence of a microwave field. These experiments reveal a strong correlation between fluorescence suppression in NV centers and the rise of the local temperature inside the diamond crystal. This finding sheds light on quantum pathways behind stimulated fluorescence quenching in NV centers of diamond and may imply significant limitations on the applications of this effect as a method of superresolving imaging in biological systems.