# Tag Info

### HHL for the pseudoinverse in Qiskit

I can imagine if You can decompose the matrix there is a way to build the complete thing more efficiently. However, in the end, You have to be able to construct the matrix one way or another.
• 21
1 vote
Accepted

### Confusing notation in Block-Encoding

I will try to answer this question for myself. We know that an $a$-qubit quantum state $|\psi\rangle$ lives in a $2^a$-dimensional Hilbert space $\mathcal{H}$. The operator $\mathbb{1}$ acting on \$|\...
• 131

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