A single silicon-vacancy spin in a diamond nanocavity performs asynchronous Bell-state measurements, more than quadrupling the secret key rate of measurement-device-independent quantum key distribution over direct transmission.
An integrated nanophotonic quantum register based on silicon-vacancy spins in diamond
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abstract
We realize an elementary quantum network node consisting of a silicon-vacancy (SiV) color center inside a diamond nanocavity coupled to a nearby nuclear spin with 100 ms long coherence times. Specifically, we describe experimental techniques and discuss effects of strain, magnetic field, microwave driving, and spin bath on the properties of this 2-qubit register. We then employ these techniques to generate Bell-states between the SiV spin and an incident photon as well as between the SiV spin and a nearby nuclear spin. We also discuss control techniques and parameter regimes for utilizing the SiV-nanocavity system as an integrated quantum network node.
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Experimental demonstration of memory-enhanced quantum communication
A single silicon-vacancy spin in a diamond nanocavity performs asynchronous Bell-state measurements, more than quadrupling the secret key rate of measurement-device-independent quantum key distribution over direct transmission.