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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

7.2 Bras and kets

It’s now time to formalize our understanding of |0⟩ and |1⟩ and relate them to the discussion of linear algebra in Chapter 5, “Dimensions.”

When we previously looked at vector notation in section 5.4.2, we saw several forms, such as bra ket vector$bra vector$ket Dirac, Paul Dirac bra-ket notation ⟨ | (bra) | ⟩ (ket)

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We now add two more invented by Paul Dirac, an English theoretical physicist, for use in quantum mechanics. They simplify many of the expressions we use in quantum computing.

Given a vector v = (v1, v2, …, vn), we denote by v|, pronounced “bra-v,” the row vector

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where we take the complex conjugate of each entry.

For w = (w1, w2, …, wm), |w, pronounced “ket-w,” is the column vector

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without the conjugations.

To avoid notational overload, I continue to put vector...

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