Quantum computers: are they here?

Are quantum computers here? This morning, IBM announced their 20-qubit processor is now available, with a 50-qubit prototype (a device, not a simulator) that has been successfully measured and tested and will be available in their next-generation systems. The 5 qubit system was impressive, as was the 16 qubit system. But one of the most impressive things has been the rate at which IBM has progressed. The ability to reliably operate several working quantum ...

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