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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

3.8 Doubling down

So far, we’ve seen finite and infinite groups, rings, and fields, some of which are extensions of others. In this section, we look at combining them.

Consider the collection of all pairs of integers (a, b), where we define addition and multiplication component-wise.

Displayed math

This is a ring, denoted Z2, but it is not an integral domain. (1, 0) × (0, 1) = (0, 0), but neither of the factors is 0.

For the same reason, neither Q2 nor R2 can be an integral domain. In particular, they are not fields with these operations.

Let’s change the definitions for R2 so that 1 = (1, 0) and multiplication is

Displayed math

For (a, b) ≠ 0, we define

Displayed math

With these unusual definitions for multiplication and inversion, we not only have an integral domain, we have a field, which we examine in the next section.

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