0
$\begingroup$

How can you plot the bell state on a Bloch sphere?

bell = QuantumCircuit(2)

bell.h(0)

bell.x(1)

bell.cx(0,1)

Is there any good reference for understanding how to create a bell state using a quantum circuit?

$\endgroup$

1 Answer 1

1
$\begingroup$

You cannot plot the Bell state using a single Bloch sphere, as it can be used exclusively for a single qubit representation.

However, there exist other ways to visualize the Bell state.

One would be using multivector Bloch representations for each qubit separately: plot_bloch_multivector() from Qiskit.

Bell state

As you can see, the spheres are empty. This is because the two qubits are maximally entangled.

Another representation is called qsphere. The size of the points is proportional to the probability of measuring the corresponding configuration. The phase is represented by color.

qsphere

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.