From a single atom to manufacturable quantum processors in silicon

David K. Ferry

Thomas F. Watson, Stephan G. J. Philips, Erika Kawakami +9 more

Anthony J. Sigillito, James C. Loy, D. M. Zajac +3 more

Stefano Paesani, Anthony Laing

Lukasz Komza, Polnop Samutpraphoot, Mutasem Odeh +8 more

Silicon is the ideal material for building electronic and photonic circuits at scale. Integrated photonic quantum technologies in silicon offer a promising path to scaling by leveraging advanced semiconductor manufacturing and integration capabilities. However, the lack of deterministic quantum light sources and strong photon-photon interactions in silicon poses a challenge to scalability. In this work, we demonstrate an indistinguishable photon source in silicon photonics based on an artificial atom. We show that a G center in a silicon waveguide can generate high-purity telecom-band single photons. We perform high-resolution spectroscopy and time-delayed two-photon interference to demonstrate the indistinguishability of single photons emitted from a G center in a silicon waveguide. Our results show that artificial atoms in silicon photonics can source single photons suitable for photonic quantum networks and processors.

Michelle Yvonne Simmons

The realisation of a large-scale error corrected quantum computer relies on our ability to reproducibly manufacture qubits that are fast, highly coherent, controllable and stable. The promise of achieving this in a highly manufacturable platform such as silicon requires a deep understanding of the materials issues that impact device operation. In this talk I will demonstrate how we engineer every aspect of the processor using atom qubits in silicon for fast, controllable exchange coupling [1], fast, high fidelity qubit initialisation and read-out [2]; low noise all epitaxial gates for highly stable qubits [3], [4]; and efficient, high fidelity qubit control [5], [6] leading to the demonstration of the highest fidelity Grover's algorithm to date [7].