Quantum Bayesian Networks

April 9, 2019

I’m on my way to Canaan’s Land, I did it my way

Filed under: Uncategorized — rrtucci @ 3:08 am

The grand challenge: Minimizing Cost functions obtained from parameterized quantum circuits. It’s not obvious what is the best way to do this, but doing this efficiently is an absolute necessity for the Hybrid Quantum Classical computing Programme of Rigetti and others to succeed, I think.

After weeks of deliberation, this weekend I finally decided on my own plan to meet this challenge. I am coding it as we speak. I’m lucky that I am the main author of the quantum simulator Qubiter, because it provides me a lot of polished tools that I know inside out, and that are necessary or extremely useful to meet this challenge. It’s a big head start on others who might embark on the same quest and would try to write their own Qubiter-like tools first. I am also fortunate that my friend Dr. Tao Yin is going to help me.

My idea looks very promising to me, but as Richard Feynman once warned in one of my favorite quotes of his, human beings are very good at fooling themselves, the easiest person to fool is yourself. So even though it looks great to me now, my algo might turn out to be a dud. Still, it will be a lot of fun to test its worth.

On previous blog posts, I have commented on the software PennyLane, which is attempting to meet this challenge. Tonight, during my daily visit to arXiv, I noticed two papers, one that came out today (https://arxiv.org/abs/1904.03206), and another that came out on Mar 28 (https://arxiv.org/abs/1903.12166) that attempt to meet this grand challenge too, by using a tomographic approach. PennyLane and this tomographic approach are formidable competitors to my approach, which is quite different to theirs. It will be fun to race them against each other, even if mine loses.

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