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)

Adding more coins – straight and cheating

Up until now, our recipes have been mainly of the 1- or 2-qubit sort. With our simulator, there is nothing stopping us from adding more qubits to our circuits at will, with the caveat that each additional qubit will require more and more processing power from the system on which your simulator runs. For example, the IBM Quantum Experience® qasm_simulator runs on an IBM POWER9™ server and maxes out at around 32 qubits.

In this recipe, we will create two 3-qubit quantum programs, one multi-coin toss, and one new entangled state called GHZ (for Greenberger–Horne–Zeilinger state).

Instead of doing this by creating two separate files, we will take a look at a new command, reset(). As the name implies, using the reset() command with a qubit sets it back to its original state of , ready to start a new quantum computing round. In this example, we use reset() to run two quantum programs in a row, writing to two...