******** Special Seminar ********

Speaker ： Yan-Cheng Wei (PhD student, Harvard University)

Title ： Quantum network and blind quantum computing with silicon-vacancy centers in nanophotonic cavities

Time ：13:00-14:00, Friday, 2025/1/17

Place ：P512, 5F, General Building III, Nat'l Tsing Hua Univ.

Host ： Prof. Ray-Kuang Lee (NTHU)

Abstract:
Quantum network, a technology to distribute entanglement over distances, has the potential to enable secure communications and distributed quantum computing. The key obstacle thus far has been the difficulty in achieving efficient light-matter interfaces while accessing multi-qubit controls. In this talk, I will first talk about our approach to realizing a two-node quantum network based on the silicon-vacancy center (SiV) in diamond in nanophotonic cavities. Each node contains an electronic spin communication qubit and a nuclear spin memory qubit, while cavity-enhanced interactions enable heralded entangling gates between the spin qubits and time-bin photons, allowing us to generate remote entanglement between two physically separate nodes. This directly enables applications leveraging distributed quantum systems, such as blind quantum computing (BQC). In the second part, I will talk about our recent work in experimental demonstration of BQC using this two-node quantum network. Specifically, I will report the first experimental implementation of a universal gate set for matter-based BQC, including distributed blind operations, using a two-node SiV-based quantum network.