Quantum Computing: A Beginner’s Notes and Overview of IBM's Quantum Experience

https://developer.ibm.com/dwblog/2017/quantum-computing-coding-ibm-q-experience/?social_post=950668007&fst=Discover&linkId=39105389

by rbanffy • 9 years ago

103 3 9 years ago

developer.ibm.com

darkkindness• 9 years ago

But there is more to try–the Beginner’s Guide has a number of different experiments available—from Bit-flip encoders, to Grover’s and Shor’s algorithms. Am I ready to understand a quantum score like this? Well, maybe not just yet. Some day though…

The enthusiasm! I love it. However...

I remember reading a post from Algorithmic Assertions[1] which gave a wonderful example of the use of intuition in designing/transforming a quantum circuit. He walks through every step, starting with a simple swap circuit and ending with a proof of quantum teleportation. It was kind of magical to see all the tricks used. Inserting CNOTS in order to optimize out certain gates? Knowing that controlled-Z gates are equivalent if flipped around? Transposing H gates with X or Z gates to turn an X into a Z and vice versa?

I stress the importance of the steps here, because if your goal is to be able to build fancy quantum scores, it isn't enough, most likely, to just read the Beginner's guide and grok Shor's algorithm -- it's really important to have the intuition needed to write your own algorithms. It is exactly like learning how to code again.

[1] http://algassert.com/post/1628

kcasey1234• 9 years ago

The link you've posted is excellent too. I suppose its a bit more than just learning a new programming language. It feels to me like learning to code a new programming language in a foreign language. There's the mechanics and syntax of working the composer AND the actual meaning of the gates that have to be grepped. And I'm still a long way from knowing intuitively that "When a Hadamard hops over an X gate (a NOT), the X gets turned into a Z" :)

cynicaldevil• 9 years ago

If someone wants a more detailed explanation about the gates mentioned in the blog, consider reading the introductory chapter to 'Quantum Computation and Quantum Information' by Neilsen and Chuang.

Quantum Computing: A Beginner’s Notes and Overview of IBM's Quantum Experience

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