Specify control state

[zohimchandani]

Required prerequisites

• [x] Search the issue tracker to check if your feature has already been mentioned or rejected in other issues.

Describe the feature

This is how to perform controlled operations:

import cudaq

@cudaq.kernel
def x_kernel(qubit: cudaq.qubit):
    x(qubit)

@cudaq.kernel
def kernel():
    
    controls = cudaq.qvector(2)
    target = cudaq.qubit()
    
    # Default: apply the x_kernel if controls are |1> 
    cudaq.control(x_kernel, controls, target) 
    
results = cudaq.sample(kernel)
print(cudaq.draw(kernel))

Currently, when the controls = 11 the target is applied.

What if I want to specify the control state for which the target is applied?

I may want to apply the target when the controls = 01 or controls = 00

See here for similar feature in qiskit.