Book Image

A Practical Guide to Quantum Machine Learning and Quantum Optimization

By : Elías F. Combarro, Samuel González-Castillo
4.5 (2)
Book Image

A Practical Guide to Quantum Machine Learning and Quantum Optimization

4.5 (2)
By: Elías F. Combarro, Samuel González-Castillo

Overview of this book

This book provides deep coverage of modern quantum algorithms that can be used to solve real-world problems. You’ll be introduced to quantum computing using a hands-on approach with minimal prerequisites. You’ll discover many algorithms, tools, and methods to model optimization problems with the QUBO and Ising formalisms, and you will find out how to solve optimization problems with quantum annealing, QAOA, Grover Adaptive Search (GAS), and VQE. This book also shows you how to train quantum machine learning models, such as quantum support vector machines, quantum neural networks, and quantum generative adversarial networks. The book takes a straightforward path to help you learn about quantum algorithms, illustrating them with code that’s ready to be run on quantum simulators and actual quantum computers. You’ll also learn how to utilize programming frameworks such as IBM’s Qiskit, Xanadu’s PennyLane, and D-Wave’s Leap. Through reading this book, you will not only build a solid foundation of the fundamentals of quantum computing, but you will also become familiar with a wide variety of modern quantum algorithms. Moreover, this book will give you the programming skills that will enable you to start applying quantum methods to solve practical problems right away.
Table of Contents (27 chapters)
1
Part I: I, for One, Welcome our New Quantum Overlords
4
Part II: When Time is Gold: Tools for Quantum Optimization
10
Part III: A Match Made in Heaven: Quantum Machine Learning
16
Part IV: Afterword and Appendices
17
Chapter 13: Afterword: The Future of Quantum Computing
19
Bibliography
20
Index
Appendix A: Complex Numbers
Appendix E: Production Notes

4.4 Solving optimization problems on quantum annealers with Leap

So far, we have run a couple of different optimization problems on actual quantum annealers. However, we have always used the default parameters and we do not even know the characteristics of the quantum computers that we are using. In this section, we shall remedy that. We will explain the different types of annealers that we can access through D-Wave Leap. We will also explore several hyperparameters that we can tweak when we are using these devices, and we will explain how to adjust the way in which our problems are embedded in the physical qubits — we will finally learn what that mysterious EmbeddingComposite object is used for!

4.4.1 The Leap annealers

You can list the devices to which you have access with your Leap account by using the get_solvers method in this way:

from dwave.cloud import Client 
 
for solver in Client.from_config().get_solvers(): 
 
    print(solver)

The results will depend on your actual...