CHICAGO—A Silicon Valley startup broke ground Tuesday afternoon at a former steelworks site on the Southeast Side for what is planned as the nation’s first large-scale quantum computing facility.

The company—called PsiQuantum—will be the anchor tenant for the Illinois Quantum and Microelectronics Park, a multi-million-dollar effort by lawmakers, universities and the private sector to make Chicago a hub for research in quantum computing : an emerging technology that aims to use quantum mechanics to solve complex problems quickly. The park will be located on a former U.S. Steel site that has been vacant for three decades in a majority Black and Latino neighborhood overburdened by environmental harms.

Quantum computing is an emerging field and computing projects are underway in New York Cit

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