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Learn Quantum Computing with Python and IBM Quantum

Learn Quantum Computing with Python and IBM Quantum

By : Robert Loredo
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Learn Quantum Computing with Python and IBM Quantum

Learn Quantum Computing with Python and IBM Quantum

By: Robert Loredo

Overview of this book

IBM Quantum Lab 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 on several real quantum computers. Updated with new examples and changes to the platform, this edition begins with an introduction to the IBM Quantum dashboard and Quantum Information Science Kit (Qiskit) SDK. You will become well versed with the IBM Quantum Composer interface as well as the IBM Quantum Lab. You will learn the differences between the various available quantum computers and simulators. Along the way, you’ll learn some of the fundamental principles regarding quantum mechanics, quantum circuits, qubits, and the gates that are used to perform operations on qubits. As you build on your knowledge, you’ll understand the functionality of IBM Quantum and the developer-focused resources it offers to address key concerns like noise and decoherence within a quantum system. You’ll learn how to monitor and optimize your quantum circuits. Lastly, you’ll look at the fundamental quantum algorithms and understand how they can be applied effectively. By the end of this quantum computing book, you'll know how to build quantum programs and will have gained a practical understanding of quantum computation that you can apply to your business.
Table of Contents (18 chapters)
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14
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15
Index

Exploring the Bell states

For most of the examples in this book, you will notice that we reuse a simple two-qubit quantum circuit to run many of our experiments. This circuit contains two gates, a single-qubit gate, and a multi-qubit gate, a Hadamard and CNOT, respectively.

The reason for choosing this was not random. In fact, this circuit has a name, the Bell state. The Bell state, which was originally described in a theoretical paper by John Bell in 1964, describes how there are four maximally entangled quantum states between two qubits that are in a superposition state. These four states are commonly referred to as the Bell states.

At this point, you may be wondering why this is so important. Well, if we can prepare qubits to a particular state, in this case, the maximally entangled state, this can help streamline the creation of various quantum circuits and algorithms. To learn more about this, let’s first prepare the four Bell states, and perhaps, along the way...

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