automatic diffirentaion through circuit with conditional gate

[rezah]

It is possible to do automatic differentiation through a circuit with conditional gates. I mean variationally optimize the circuit with gates that are applied based on themed-circuit measurement.

[GiggleLiu]

It is hard to do it directly. Try using lower level interfaces like apply and mat. Their backward rules are ported to ChainRules. Maybe you can try writing the loss using Zygote.

[GiggleLiu]

Please check this issues: #323