A diamond road toward scalable quantum information networks

Because  of  their  great  potential  as  the  most  secure communication  system  and  their  promising 
scalability  in  quantum  computing,  quantum  information networks  emerged  and  have  been  an 
important field in physics research in recent 15 years. Building practical quantum network calls for 
long  coherence  time  and  feasibly  scale-up  physical systems.  In  recent  10  years,  point  defects  with 
individual controllable spins come into the focus due to their scalability, ability of interacting with 
photons,  and  long  coherence  times.  One  most  promising system  is  nitrogen  vacancy  centers  in 
diamond. In this talk, we will start by introducing the hybrid quantum nodes composed of an electron 
spin and several nuclear spins around, the ways to operate them and their coherence properties. We 
will discuss how to build the practical quantum information networks based on coherent absorption.