laboratoire pierre aigrain
électronique et photonique quantiques
laboratoire pierre aigrain

Seminar, May 12th 2016 (14h00- 235C 29 rue d’Ulm)

Guilherme Tosi (UNSW Australia)
Scaling-up the phosphorus-in-silicon quantum processor

Quantum computers will allow specific algorithms to be performed with unprecedented efficiency and push ahead the frontiers of knowledge. Donor spin qubits in silicon are an ideal platform for that : they can be fabricated with standard semiconductor processes, are controlled with error rates as small as 10-4 and maintain their quantum coherence for almost a minute [1]. However, multi-qubit operations and long-distance donor coupling remain a formidable challenge. Here we present a scalable design for a silicon quantum processor [2] that is compatible with current fabrication capabilities. Quantum information is encoded in the electron-nuclear spin states, while long-distance high-fidelity interactions can be achieved either via direct electric dipole interactions or via photonic links. Prototypical devices are fabricated to demonstrate the processor’s basic units.

[1] J. T. Muhonen, Nature Nanotechnol. 9, 986 (2014).

[2] G. Tosi, arXiv:1509.08538 (2015)