Control and coherence of tin-vacancy qubits in diamonds

Color centers in diamonds are promising building blocks for realizing quantum network nodes, thanks to their good optical and spin properties as well as the naturally occurring ¹³C-memory qubits in the diamond. Using NV centers, a multi-node network and teleportation of qubit states between non- neighboring nodes have been demonstrated. However, the optical properties of the NV currently hinder on-chip integration and scaling-up of quantum networks. 

The tin-vacancy (SnV) center emerged as a resourceful alternative platform thanks to its improved optical properties, the second-long relaxation times expected around 1K, and compatibility with nanophotonic integrated devices. Together with the recent developments in diamond nanofabrication techniques and hybrid integrated photonics, this makes the SnV interesting for realizing scalable platforms and on-chip devices. 

Here we report on our progress towards an efficient nanophotonic spin-photon interface for a quantum network node using the SnV. We show coherent driving of the SnV at 1K using MW driving of the spin state, demonstrating high-fidelity qubit control. Furthermore, we will present our latest results on SnV spin coherence studies at 1K as well as use of dynamical decoupling techniques.