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Séminaire QUEST

Jeudi 11 janvier à 9h30,
Salle Rémy Lemaire, K223

Orateur : Nicolas DIDIER (Rigetti Computing, Berkeley, California, USA)
"Hybrid quantum/classical computing on a 19-qubit processor based on parametrically-activated entangling gates"


Superconducting devices are one of the most promising platforms for building quantum computers, but demonstrating fault-tolerance on any quantum computing implementation remains a challenge. In recent years new hybrid quantum/classical algorithms targeting near-term devices have been proposed, focusing on short-depth parameterized quantum circuits and using quantum computation as a subroutine embedded in a larger classical optimization loop, without the immediate need for fault-tolerance. Rigetti Computing has built a flexible computing platform targeting precisely such hybrid applications, relying on custom entangling gates based on parametrically-activated interactions. In this talk I will explain the physics behind these two-qubit gates, how it enables the implementation of two distinct classes of entangling operations, and describe many features that make this architecture attractive from a scalability perspective. Finally, I will present how this gate architecture was used to demonstrate a hybrid algorithm for an unsupervised machine learning task known as clustering on a 19-qubit processor.

References : arXiv:1712.05771, arXiv:1706.06570, arXiv:1706.06562, arXiv:1706.06566, arXiv:1608.03355,

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