O indicates open source

Preliminary: Quantum is Open Source

Brian N. Siegelwax
The Modern Scientist
3 min readJan 12, 2024


You probably don’t realize how much there is.

With the disclaimer that I’m still filling in the blanks of my Quantum Technology Database, one “cost” classification is standing out among the others. This is subject to change, of course, but the early percentage share caught my attention and I’d like to share this observation with you.

I’m currently tracking 276 open source products.

If you think of the name-recognizable quantum computing libraries, the title of this article won’t shock you. You can probably think of several open source products off the top of your head. However, I’m currently tracking 276 open source products. Even the Quantum Open Source Foundation (QOSF) isn’t tracking that many.

If that number doesn’t surprise you, maybe this will: not all of these products are related to computing software. Just today, for example, I added an open source quantum Internet simulator. I’ve previously added other open source products related to communication, as well as to computing hardware. Not everyone is working on a QASM simulator is what I’m saying.

Furthermore, many of these are not side projects. Some are, of course, and their repositories are quite small. But many are not so small, and it can take a while to…