Book Image

Dancing with Python

By : Robert S. Sutor
Book Image

Dancing with Python

By: Robert S. Sutor

Overview of this book

Dancing with Python helps you learn Python and quantum computing in a practical way. It will help you explore how to work with numbers, strings, collections, iterators, and files. The book goes beyond functions and classes and teaches you to use Python and Qiskit to create gates and circuits for classical and quantum computing. Learn how quantum extends traditional techniques using the Grover Search Algorithm and the code that implements it. Dive into some advanced and widely used applications of Python and revisit strings with more sophisticated tools, such as regular expressions and basic natural language processing (NLP). The final chapters introduce you to data analysis, visualizations, and supervised and unsupervised machine learning. By the end of the book, you will be proficient in programming the latest and most powerful quantum computers, the Pythonic way.
Table of Contents (29 chapters)
Part I: Getting to Know Python
PART II: Algorithms and Circuits
PART III: Advanced Features and Libraries
Other Books You May Enjoy
Appendix C: The Complete UniPoly Class
Appendix D: The Complete Guitar Class Hierarchy
Appendix F: Production Notes

9.7 Quantum circuits

We have now seen all the quantum gates we will need in this book, and it’s time to compose them into circuits.

The goal of a quantum algorithm as implemented in a circuit is to manipulate the qubits’ states so that the 0s and 1s we get when we measure have a very high probability of being the correct answer.

9.7.1 A basic circuit

I’ve done this already in simple cases, but let’s see what a basic circuit looks like from beginning to end.

A basic quantum circuit
Figure 9.12: A basic quantum circuit

The circuit in Figure 9.12 contains a quantum register with one qubit. The initialization phase is to the left of the first vertical dotted line. In this phase, we initialize qubit q0 to |0⟩. If we do not explicitly display |0⟩, you may assume that the qubit starts in that state. We call the horizontal line a wire...