Book Image

Quantum Computing in Practice with Qiskit® and IBM Quantum Experience®

By : Hassi Norlen
5 (1)
Book Image

Quantum Computing in Practice with Qiskit® and IBM Quantum Experience®

5 (1)
By: Hassi Norlen

Overview of this book

IBM Quantum Experience® is a leading platform for programming quantum computers and implementing quantum solutions directly on the cloud. This book will help you get up to speed with programming quantum computers and provide solutions to the most common problems and challenges. You’ll start with a high-level overview of IBM Quantum Experience® and Qiskit®, where you will perform the installation while writing some basic quantum programs. This introduction puts less emphasis on the theoretical framework and more emphasis on recent developments such as Shor’s algorithm and Grover’s algorithm. Next, you’ll delve into Qiskit®, a quantum information science toolkit, and its constituent packages such as Terra, Aer, Ignis, and Aqua. You’ll cover these packages in detail, exploring their benefits and use cases. Later, you’ll discover various quantum gates that Qiskit® offers and even deconstruct a quantum program with their help, before going on to compare Noisy Intermediate-Scale Quantum (NISQ) and Universal Fault-Tolerant quantum computing using simulators and actual hardware. Finally, you’ll explore quantum algorithms and understand how they differ from classical algorithms, along with learning how to use pre-packaged algorithms in Qiskit® Aqua. By the end of this quantum computing book, you’ll be able to build and execute your own quantum programs using IBM Quantum Experience® and Qiskit® with Python.
Table of Contents (12 chapters)

Fixed z rotations with phase shift gates S, , T, and

The S, , T, and gates all perform rotations around the z axis of the qubit. This means that when you measure the qubit, there is no change in the probability of measuring the outcome as 1 or 0. What does change is the phase of the qubit.

The S-gate and T-gate are not their own inverses

As the S and T gates perform set rotations around the z axis, they are not reversible. Adding two of these gates in a row does not negate them. Instead, Qiskit includes the S† and T† gates which serve as the reverse S and T gates. For a quick reminder, see the A quick introduction to quantum gates recipe in Chapter 2, Quantum Computing and Qubits with Python.

Mathematically, the S and T gates can be expressed as the following unitary matrixes:

The sample script is available at: https://github.com/PacktPublishing/Quantum-Computing-in-Practice-with-Qiskit-and-IBM-Quantum-Experience/blob/master/Chapter06/ch6_r1_quantum_qate_ui...