I have a code of 10 qubits. How to know the probability of each qubit?

The code is:

qml.Identity(wires=0)

qml.Identity(wires=1)

qml.Identity(wires=2)

qml.Identity(wires=3)

qml.Identity(wires=4)

qml.Identity(wires=5)

qml.Identity(wires=6)

qml.Identity(wires=7)

qml.Hadamard(wires=8)

qml.Hadamard(wires=9)

qml.Barrier()

for idx, px_value in enumerate(phi[::-1]):

if (px_value==‘1’):

qml.Toffoli(wires=[9,8,idx])

qml.Barrier()

measurement = [qml.expval(qml.PauliZ(i)) for i in range(wires)]

return measurement

I want to return both probability and measurement. How to do that also?

Hey @mass_of_15,

To return the probability of each qubit (10 in your case), you can return `qml.probs(wires=range(10))`

. In addition, QNodes can return multiple measurements. Consider this code example:

```
qml.enable_return()
dev = qml.device("lightning.qubit", wires=2)
@qml.qnode(dev)
def circuit():
qml.Hadamard(0)
qml.Hadamard(1)
return qml.probs(wires=range(2)), qml.expval(qml.PauliX(0))
circuit()
# Output: (tensor([0.5, 0.5, 0. , 0. ], requires_grad=True), tensor(1., requires_grad=True))
```

All of the available measurements and use cases can be found here.

Let me know if that helps!