How can I simulate depolarizing errors in Qiskit? - 1 Minute Qiskit
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- Опубликовано: 10 мар 2024
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This week, the question is: How can I simulate depolarizing errors?
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Hello...
How can I get the actual quantum state when I only know the expectation value of that particular state?
What does the circuit (qc) actually do? It would be helpful to know this to understand the result
The X gate creates a flip of the qubit such that the result you get from setting an initial state of |0> will now be |1>. You can see this in the cell below the one the person is writing in, that the probability for getting |1> is 1.0. However once you add the depolarising error, you get a nonzero probability of getting |0> again, not just |1>.
How do I create a unitary parameterized gate with ParameterVector and specifying its matrix? I tried to build it in the same way than circuit.u is built, but it raises an error when I use my gate via circuit.unitary():
"ParameterExpression with unbound parameters (dict_keys([ParameterVectorElement(θ[0]), ParameterVectorElement(θ[1])])) cannot be cast to a complex."
I saw that a general rotation (circuit.u) in qiskit is permormed by 3 rotations Rz·Ry·Rz, but I'm trying to build a general rotation with the following operator:
U_xyz = exp[-i theta (nx sigmaX + ny sigmaY+ nz sigmaZ) ] ,
where the parameters would be theta, nx, ny and nz, in principle.
My question is, why it raises that error in my case and not in circuit.u? I also checked that circuit.u matrix is complex, indeed.
On the other hand, I tried to build my gate via circuit.append(), but I'm not sure how to do it.
Thanks