Track overall phase?

[amirebrahimi]

How difficult would it be to add phase tracking to Tableau/simulators as an option (disabled by default)?

[Strilanc]

My understanding was that phase tracking made the Hadamard gate have quadratic cost instead of linear cost, so the performance characteristics were quite different and it requires a totally different simulation strategy.

I'm not opposed to adding a simulator that can do it, but I suspect we're talking about a week's or a month's worth of programming work.