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Dancing with Qubits

Dancing with Qubits

By : Robert S. Sutor
5 (24)
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Dancing with Qubits

Dancing with Qubits

5 (24)
By: Robert S. Sutor

Overview of this book

Dancing with Qubits, Second Edition, is a comprehensive quantum computing textbook that starts with an overview of why quantum computing is so different from classical computing and describes several industry use cases where it can have a major impact. A full description of classical computing and the mathematical underpinnings of quantum computing follows, helping you better understand concepts such as superposition, entanglement, and interference. Next up are circuits and algorithms, both basic and sophisticated, as well as a survey of the physics and engineering ideas behind how quantum computing hardware is built. Finally, the book looks to the future and gives you guidance on understanding how further developments may affect you. This new edition is updated throughout with more than 100 new exercises and includes new chapters on NISQ algorithms and quantum machine learning. Understanding quantum computing requires a lot of math, and this book doesn't shy away from the necessary math concepts you'll need. Each topic is explained thoroughly and with helpful examples, leaving you with a solid foundation of knowledge in quantum computing that will help you pursue and leverage quantum-led technologies.
Table of Contents (26 chapters)
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1
I Foundations
8
II Quantum Computing
14
III Advanced Topics
18
Afterword
22
Other Books You May Enjoy
23
References
24
Index
Appendices

9.6 Amplitude amplification and interference

Suppose we have three qubits, and one of their quantum state standard basis kets {|000⟩, …, |111⟩} corresponds to a solution to some problem. We want to devise an algorithm to pick the correct ket and find the answer. I’m purposely not telling you the problem or how the kets map to the data and solution. Just assume we want to identify one of them that the algorithm can determine as best. algorithm$amplitude amplification amplitude$amplification

The first question is how to see that this best ket stands out from the others. The general form for a 3-qubit quantum register state is

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with

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If we initialize each qubit to |0⟩ and then apply H⊗3, we get a balanced superposition: balanced superposition superposition$balanced

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All the coefficients are equal, and the square of each absolute value is 1/8. If we measure the qubits now, we have an...

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