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)

Mitigating the unexpected with quantum error correction

As we saw in the previous recipe, it is good to understand how your measurements behave, to statistically be able to correct incorrect readouts. But in the end, a measurement is just a measurement, and a measurement of a qubit will result in either 0 or 1. If the state of the qubit that you measure turns out to be instead of the expected , it doesn't matter that you statistically corrected for measurement mistakes; your qubit is off by 100%.

There are a lot of things that can perturb our qubits, from gate errors to just plain physics that causes the qubit to decohere and dephase (remember the T1 and T2 times). In the classical computing world, we can periodically check in on our bits, and apply error correction coding to make sure that they behave. Digital error correction is one of the reasons that digital communication works and that you can play digital media, CDs, DVDs, and Blu-ray disks and actually hear or see what...