New answers tagged bloch-sphere
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Rxx gate as a set of rotations
Finally I found the answer. Bloch sphere coincides with a qubit only before the first controlled operation. After that Bloch sphere shows a "probability", while the real 3D-position of the ...
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Rxx gate as a set of rotations
Why Qiskit shows the arrows shorter? Is it a bug or a feature (partially entangled states)?
The arrows are shorter because of entanglement. This behavior is described in Qiskit's textbook[1]. One ...
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Find a set of vectors on the Bloch sphere such that $\langle \psi_i | \psi_j \rangle = \frac{1}{\sqrt{n}}$
Essentially, you're given the Gram matrix $G$ ($G_{ii} = 1$, $G_{ij} = \frac{1}{\sqrt{n}}, i\neq j$) for a set of vectors. You can realize the vectors as columns of the square root of it, $\sqrt{G}$, ...
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Find a set of vectors on the Bloch sphere such that $\langle \psi_i | \psi_j \rangle = \frac{1}{\sqrt{n}}$
You do this iteratively. Start with
$$
|\psi_1\rangle=|0\rangle.
$$
Then, one component of $|\psi_2\rangle$ is fixed to get the correct inner product, so add one more component with an amplitude set ...
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When using Qiskit's plot_bloch_vector function, how can I set colors for vectors?
A simple way to do that is by using Bloch class[1] directly which accepts a list of vector colors to cycle through:
...
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Are qubits just analog, continuous classical bits?
Another point of view for this could be a complexity one. Namely, we know how to efficiently simulate analog computation classically. Whereas we still haven’t figured out how to do so for quantum ...
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Are qubits just analog, continuous classical bits?
I consider only one qubit in this explanation.
A qubit does not contain as much information as a "continuous classical needle" living in a sphere, in the following sense.
If I assume that it ...
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