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I can't speak to braket being open source, but at least two of the hardware providers, D-Wave [1] and Rigetti, have open source stacks. Disclosure, I work for D-Wave and I'm not terribly familiar with the other providers.

[1] https://github.com/dwavesystems

Last time I checked d-waves systems didn't have quantum speedup thus weren't considered true quantum computers.

This is a tricky point, but I would say that D-Wave systems are quantum computers, however they rely on coherence, and not entanglement (coherence is necessary for entanglement, but you don't get entanglement automatically from coherence ), and thus do not have a universal set of quantum gates. D-wave systems thus can gain a quadratic advantage over classical systems, but will not see exponential speedups (likely need entanglement for this).

Thanks, that is a good list of learning materials and tools.

Several years ago I spent a few evenings with a quantum computer simulator and a SHOR algorithm example.

Years ago I met first time with quantum computing through https://www.dwavesys.com/tutorials/background-reading-series..., then there was a python simulator on website and call for the beta testers but the slot was closed quickly. Kudos for great tutorial!

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