Strilanc / Quirk

A drag-and-drop quantum circuit simulator that runs in your browser. A toy for exploring and understanding small quantum circuits.

http://algassert.com/quirk

Formula gate with invalid formula is seen as time dependent

Strilanc opened this issue 5 years ago · comments

Craig Gidney commented 5 years ago

Causes CPU usage to stay non-zero

https://algassert.com/quirk#circuit=%7B%22cols%22%3A%5B%5B%7B%22id%22%3A%22Z%5Eft%22%2C%22arg%22%3A%22BAD%22%7D%2C%7B%22id%22%3A%22Z%5Eft%22%2C%22arg%22%3A%22BAD%22%7D%2C%7B%22id%22%3A%22Z%5Eft%22%2C%22arg%22%3A%22BAD%22%7D%2C%7B%22id%22%3A%22Z%5Eft%22%2C%22arg%22%3A%22BAD%22%7D%2C%7B%22id%22%3A%22Z%5Eft%22%2C%22arg%22%3A%22BAD%22%7D%2C%7B%22id%22%3A%22Z%5Eft%22%2C%22arg%22%3A%22BAD%22%7D%5D%5D%7D

Kunal Marwaha commented 4 years ago

It seems that a bad formula is a custom disable reason of a gate.
Could a disabled gate set "_hasNoEffect" or stableDuration to Infinity?

I've attached a PR that offers one approach, but it may not be the best one.