A quantum emitter with a lambda-shaped energy scheme spontaneously decays into a coherent superposition of its two ground states when placed near a metasurface that makes the vacuum anisotropic; the effect is predicted to be observable with NV centers.
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Long-lifetime coherence in a quantum emitter induced by a metasurface
A quantum emitter with a lambda-shaped energy scheme spontaneously decays into a coherent superposition of its two ground states when placed near a metasurface that makes the vacuum anisotropic; the effect is predicted to be observable with NV centers.