HHL alghoritm

Hi guys,
I’m studying the HHL alghoritm and I’m trying to do an his implementation but, there are some points that I don’t understand:
1) how can I transform my hermitian Matrix into his unitary operator?
2)when I have to do controlled rotation conditioned on the eigenvalue, I know that the angle Is equal ti arcsin(C/lambda), but if I don’t know the eigenvalue how I can implement this rotation?

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2 Answer(s)

I’m not an expert with HHL.  However, this paper from Reviews in Physics  has some references.  https://www.sciencedirect.com/science/article/pii/S2405428318300571?via%3Dihub

Answered on May 5, 2021.
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Hi Simona,

I just saw this. I am new to this forum (just joined today). I am happy to address this but typing the kets and bars and matrices here on this interface is a bit of a challenge. I am also not able to see any attachment links here so cannot do a write up and attach a pdf…

Answered on July 16, 2021.
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