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?
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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.
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.