Distributed Quantum Computing in Silicon

Synopsis

Quantum technology will usher in world-changing capabilities only once scalable, fault-tolerant quantum systems emerge. Here I will discuss several quantum system design principles which directly follow from the single axiom that scalable fault-tolerant quantum systems will ultimately be modular in their construction to allow for unlimited horizontal scaling, and performance far beyond that of any individual quantum processor.

Such processors consume remote entanglement distributed between modules to realize distributed quantum logic. From this perspective [1], quantum networks and quantum computers ultimately can be seen as the same core technology. I will walk through the importance of the quantity and quality of quantum I/O, and how connectivity is the key to fault-tolerance as it unlocks highly efficient quantum LDPC error correcting codes [2].

I then dive into how Photonic Inc.’s Entanglement FirstTM architecture – based upon the T centre in silicon ([3]) – provides a high-performing quantum computing and networking system that can be scaled up and scaled out. I will present key quantum performance metrics and demonstrate relevant distributed quantum computing protocols [4].

[1] S. Simmons, PRXQuantum 5 (1) 010102 (2024).
[2] A. J. Malcolm, A. N. Glaudell, P. Fuentes, et al., Nat. Comms 17:7286 (2026).
[3] L. Bergeron, C. Chartrand, A.T.K. Kurkjian, et al. PRXQuantum 1:020301 (2020).
[4] Photonic Inc., arXiv: 2406.01704 (2024).