Quantum Sliced Bread

Brian N. Siegelwax
3 min readNov 23, 2022


Why Classiq + Q-CTRL is a Big Deal

Are you familiar with the expression, “the greatest thing since sliced bread?” Well, that expression, possibly originating in 1951, foreshadowed news from November 22, 2022, when Classiq announced a new partnership with Q-CTRL. And I write this with no hype bubble generator: this is a step toward practical quantum computing.

Classiq’s Quantum Algorithm Design (QAD) Platform

As I wrote in “Inside Classiq’s Synthesis Engine,” the most powerful feature of Classiq’s platform is its ability to quickly re-synthesize circuits for different providers (IBM Quantum, Azure Quantum, and/or AWS Braket), different qubit configurations, and different qubit counts. But focusing on that last one for a moment, that could mean very large qubit counts. For example, I have personally generated an albeit-trivial 1,000-qubit circuit with QAD just to see if it could; it could. So you could — today — synthesize large circuits for chemistry problems, optimization problems, finance problems, and whatever else you can dream up.

If you’re interested, by the way, in reading articles that I wrote before I used QAD, check out “Review: Classiq’s Quantum Algorithm Design (QAD) Platform” and “Demo: Classiq’s QAD Platform.” More recently I wrote “Classiq’s Quantum Circuit