Post de Arnaud RENARD

Myths around quantum computation before full fault tolerance: What no-go theorems rule out and what they don’t https://lnkd.in/e-Hc3VnZ In this perspective article, we revisit and critically evaluate prevailing viewpoints on the capabilities and limitations of near-term quantum computing and its potential transition toward fully fault-tolerant quantum computing. We examine theoretical no-go results and their implications, addressing misconceptions about the practicality of quantum error mitigation techniques and variational quantum algorithms. By emphasizing the nuances of error scaling, circuit depth, and algorithmic feasibility, we highlight viable near-term applications and synergies between error mitigation and early fault-tolerant architectures. Our discussion explores strategies for addressing current challenges, such as barren plateaus in variational circuits and the integration of quantum error mitigation and quantum error correction techniques. We aim to underscore the importance of continued innovation in hardware and algorithmic design to bridge the gap between theoretical potential and practical utility, paving the way for meaningful quantum advantage in the era of late noisy intermediate scale and early fault-tolerant quantum devices.

Back from Lindau, bis repetita. Following up on the debate: science vs engineering and will there be a single winner in the chase for fault tolerant quantum computers ? https://lnkd.in/eb6hw7QK Trouvez l’intrus :) !

This week together with our partner nVent/Schroff N.A.T. is exhibiting at IEEE International Conference on Quantum Computing and Engineering (QCE), in Montréal, Québec, Canada ... exciting and thrilling insights into this fast growing market!

On December 9th 2024, Google made the news with its 105-qubit superconducting Willow chip. The announcement contains key technology news about the capacity to correct errors in superconducting qubit quantum computers, but also, some dubious claims comparing the Willow chip with classical computers. Forming an education opinion on this announcement is a tedious and very technical task. I consolidate in a post some insights on these announcements and position them on the road towards fault-tolerant quantum computers. FTQC is about delivering on the many promises related to solving problems in healthcare, energy, climate, optimizations, and whatever market. Google's Willow is a step forward in the creation of logical qubits, but it is just one step in a long journey that will take at least a decade. The post describes the many challenges behind the long quest towards fault-tolerant quantum computers, the history of Google’s research in the field, technical details about their achievements and the remaining challenges, and comments on their cross-entropy randomized benchmark and gazillion years of classical computing comparison which doesn’t make any sense. PS: I added an explanation of the difference between being "under threshold" (in Google paper's title) and "breakeven" (mentionned in the paper) for quantum error correction codes. https://lnkd.in/eA9XvUip

On December 9th 2024, Google made the news with its 105-qubit superconducting Willow chip. The announcement contains key technology news about the capacity to correct errors in superconducting qubit quantum computers, but also, some dubious claims comparing the Willow chip with classical computers. Forming an education opinion on this announcement is a tedious and very technical task. I consolidate in a post some insights on these announcements and position them on the road towards fault-tolerant quantum computers. FTQC is about delivering on the many promises related to solving problems in healthcare, energy, climate, optimizations, and whatever market. Google's Willow is a step forward in the creation of logical qubits, but it is just one step in a long journey that will take at least a decade. The post describes the many challenges behind the long quest towards fault-tolerant quantum computers, the history of Google’s research in the field, technical details about their achievements and the remaining challenges, and comments on their cross-entropy randomized benchmark and gazillion years of classical computing comparison which doesn’t make any sense. PS: I added an explanation of the difference between being "under threshold" (in Google paper's title) and "breakeven" (mentionned in the paper) for quantum error correction codes. https://lnkd.in/eA9XvUip

Quantum computers offer many promising applications dependent on greatly improved performance. Read how we’ve combined quantum error correction with our latest superconducting processor, Willow, exponentially reducing error rates with increasing qubit scale →https://goo.gle/3ZpJI7f

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