SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 28: Spin Qubits

QI 28.6: Talk

Thursday, March 9, 2023, 12:30–12:45, F428

Control and coherence of tin-vacancy qubits in diamonds — •C. Waas, H. Beukers, M. Pasini, N. Codreanu, J. Brevoord, L. De Santis, Z. Ademi, S. Niese, F. Gu, V. Dobrovitski, J. Borregaard, and R. Hanson — QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2628CJ Delft, The Netherlands

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 (1). 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, thanks to the first-order insensitivity to electric field fluctuations arising from its symmetry properties. 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 the fabrication of single SnV centers in diamond and the investigation of their optical and spin coherence properties. Furthermore, we present our work towards spin-state control of the SnV qubit state at 1K.
(1) Hermans S. et al. Qubit teleportation between non-neighbouring nodes in a quantum network. Nature 605, 663-668 (2022).