QCircuit.CTRL() with multiple targets throws "qpp::applyCTRL(): Matrix mismatch subsystems! [A/target]"

[antoine-bussy]

Hi,

Executing the following circuit

auto const circuit = qpp::QCircuit{ 3u } .CTRL(qpp::gt.X, { 0u }, { 1u, 2u });

throws "qpp::applyCTRL(): Matrix mismatch subsystems! [A/target]"

I've implemented a unit test: antoine-bussy@fd15ca8
I suspect that is treated as a CTRL_joint in QEngine::execute.

[antoine-bussy]

Replacing U with kronpow(U, target.size()) fixes the issue. See antoine-bussy@6da00f5
But I guess it's not a very good fix performance-wise.

[antoine-bussy]

The documentation of QCircuit::CTRL states that U is a single qubit gate, unlike QCircuit::CTRL_joint.
Have I misunderstood the issue #97 ?

[vsoftco]

I see now the overload you're referring to... will check

[vsoftco]

Fixed by #135