This is a summary of all the main companies building quantum computers today, and what their most powerful machines are. You can get the digital image here: https://www.flickr.com/photos/9586967... But we can’t simply look at qubits counts because so many other factors go into the quality of a quantum computer, so here I look at the quantum volume metric which is a much better way of comparing machines. And we look at what steps these companies need to take to achieve large scale useful general purpose quantum computers, and the timelines the companies have set out to achieve these.
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-- References ---
[1] First quantum computer
https://journals.aps.org/prl/abstract...
[2] IBM Roadmap
https://research.ibm.com/blog/quantum...
[3] Google Roadmap
https://blog.google/technology/ai/unv...
[4] D-Wave Roadmap
https://www.dwavesys.com/media/xvjpra...
[5] Intel quantum computing
https://www.intel.com/content/www/us/...
[6] Rigetti
https://www.rigetti.com/
https://quantumcomputingreport.com/ri...
[7] PsiQuantum hundreds of logical qubits
https://psiquantum.com/resources
https://www.nextbigfuture.com/2020/04...
[8] ColdQuanta future prediction
https://coldquanta.com/quantum-computing
[9] CLOPS definition from IBM
https://arxiv.org/abs/2110.14108
[10] UST of China’s quantum computers
https://www.scientificamerican.com/ar...
[11] Alibaba and Baidu
https://www.scmp.com/abacus/tech/arti...
[12] Xanadu
https://spectrum.ieee.org/race-to-hun...
[13] PsiQuantum a million qubits by 2025
https://www.nextbigfuture.com/2020/04...
[14] Xanadu number of qubits (40)
https://www.wsj.com/articles/xanadu-l...
[15] ColdQuanta number of qubits (100)
https://thequantuminsider.com/2021/07...
[16] Atom computing number of qubits (100)
https://www.forbes.com/sites/moorinsi....
[17] IonQ roadmap
https://ionq.com/posts/december-09-20...
[18] Pasqal roadmap and merger with Qu&Co
https://pasqal.io/2022/01/11/quantum-...
[19] QuEra roadmap
https://www.quera.com/
[20] Silcon quantum computing roadmap
https://sqc.com.au/

-- Chapters --
00:00 Company Qubit Counts Summary
02:00 Quantum Volume and Factors Beyond Qubit Counts
05:34 The Best Quantum Computer Right Now
06:05 How To Build a General Purpose Quantum Computer
07:46 Predictions for the Rest of the Decade