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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

11.4 Decoherence

There are three measurements that quantum computing researchers frequently use to measure coherence time: T1, T2, and its cousin T2*. They are single physical qubit measurements, so we can use the Bloch sphere to discuss them. Their use goes back to Felix Bloch’s work on nuclear magnetic resonance (NMR) in the 1940s. 19 Bloch, Felix

Let’s begin with T1.

11.4.1 T1

T1 goes under several names, all of them connected to the physics of various underlying quantum processes:

  • relaxation time,
  • thermal relaxation,
  • longitudinal relaxation,
  • spontaneous emission time,
  • amplitude damping, and
  • longitudinal coherence time.

It is related to the energy loss as the quantum state decays from the higher energy |1⟩ state to the |0⟩ ground state. This energy is transmitted to, or leaked into, the environment and lost...

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