Book Image

Learn Quantum Computing with Python and IBM Quantum Experience

By : Robert Loredo
Book Image

Learn Quantum Computing with Python and IBM Quantum Experience

By: Robert Loredo

Overview of this book

IBM Quantum Experience is a platform that enables developers to learn the basics of quantum computing by allowing them to run experiments on a quantum computing simulator and a real quantum computer. This book will explain the basic principles of quantum mechanics, the principles involved in quantum computing, and the implementation of quantum algorithms and experiments on IBM's quantum processors. You will start working with simple programs that illustrate quantum computing principles and slowly work your way up to more complex programs and algorithms that leverage quantum computing. As you build on your knowledge, you’ll understand the functionality of IBM Quantum Experience and the various resources it offers. Furthermore, you’ll not only learn the differences between the various quantum computers but also the various simulators available. Later, you’ll explore the basics of quantum computing, quantum volume, and a few basic algorithms, all while optimally using the resources available on IBM Quantum Experience. By the end of this book, you'll learn how to build quantum programs on your own and have gained practical quantum computing skills that you can apply to your business.
Table of Contents (21 chapters)
Section 1: Tour of the IBM Quantum Experience (QX)
Section 2: Basics of Quantum Computing
Section 3: Algorithms, Noise, and Other Strange Things in Quantum World
Appendix A: Resources

Generating the noise effects of dephasing

T2 and T2* are similar in that they are both representing the dephasing of a qubit. The difference is in the experimental process they conduct to measure each circuit. Determining the decay time of T2* is conducted by placing the qubit in a superposition state using a Hadamard gate, then after some delay time, you apply another Hadamard gate and measure. This should result in the qubit returning to the originating state – in this case, the grounded state. This experiment is referred to as the Ramsey experiment.

To determine the decay time of T2, we will perform a similar experiment as we did for T2*, by first placing the qubit in a superposition state. The difference is that rather than waiting for some delay time before applying another Hadamard gate before measuring, you instead wait until half the delay time and then apply either an X or Y rotation, then wait until the second half delay time is complete before taking the measurement...