Abstract:
Quantum computing is advancing rapidly, with exciting recent progress on matter-qubit platforms. I will begin by presenting our recent work on the first below-threshold demonstration with a neutral-atom quantum computer [1,2].
These advances not only mark an important milestone for fault-tolerant quantum computing, but also open new opportunities for rethinking architectures for delegated secure computation, in particular blind quantum computing (BQC).
BQC allows a client to delegate quantum computations to a server while keeping both data and algorithms private. However, scaling BQC to the fault-tolerant regime remains challenging due to losses, overhead, and limited client capabilities. In this talk, I will present our recent theoretical and experimental advances toward scalable, fault-tolerant BQC using hybrid matter-photon systems. On the theory side, we introduce a new architecture with reduced communication overhead and improved error thresholds [3]. On the experimental side, we demonstrate a universal blind gate set and algorithm across a distributed two-node quantum network of silicon-vacancy centers in nanophotonic diamond cavities [4].
Together, these results establish a scalable foundation for deep-circuit blind quantum computing on matter-based platforms.
[1] Baranes et al, PRX 16, 011002 (2026)
[2] Bluvstein et al, Nature 649, 39–46 (2026)
[3] Baranes et al, arXiv: 2505.21621 (2025)
[4] Wei et al, Science 388, 509–513 (2025).