Book Image

Quantum Computing with Silq Programming

By : Srinjoy Ganguly, Thomas Cambier
Book Image

Quantum Computing with Silq Programming

By: Srinjoy Ganguly, Thomas Cambier

Overview of this book

Quantum computing is a growing field, with many research projects focusing on programming quantum computers in the most efficient way possible. One of the biggest challenges faced with existing languages is that they work on low-level circuit model details and are not able to represent quantum programs accurately. Developed by researchers at ETH Zurich after analyzing languages including Q# and Qiskit, Silq is a high-level programming language that can be viewed as the C++ of quantum computers! Quantum Computing with Silq Programming helps you explore Silq and its intuitive and simple syntax to enable you to describe complex tasks with less code. This book will help you get to grips with the constructs of the Silq and show you how to write quantum programs with it. You’ll learn how to use Silq to program quantum algorithms to solve existing and complex tasks. Using quantum algorithms, you’ll also gain practical experience in useful applications such as quantum error correction, cryptography, and quantum machine learning. Finally, you’ll discover how to optimize the programming of quantum computers with the simple Silq. By the end of this Silq book, you’ll have mastered the features of Silq and be able to build efficient quantum applications independently.
Table of Contents (19 chapters)
Section 1: Essential Background and Introduction to Quantum Computing
Section 2: Challenges in Quantum Programming and Silq Programming
Section 3: Quantum Algorithms Using Silq Programming
Section 4: Applications of Quantum Computing

Control flow in Silq

Similar to other programming languages, Silq provides control flow statements, which decide the order of execution of the code we write in Silq. Control flow is also known as conditionals, where a condition is provided and executed when some criteria are fulfilled. The statements are executed whenever a certain condition is satisfied.

In the following code, we see an example of a CH gate, which is a two-qubit gate and was discussed in in Chapter 3, Multiple Quantum Bits, Entanglement, and Quantum Circuits. The conditionals are applied using if and else statements. Curly brackets, {}, are used to begin and end a chunk of code. The syntax is given as follows:

if x {     // controlled on x,
  y:=H(y); // apply H to y

The code shows that if x qubit is true (meaning it is 1), then a Hadamard operation will be applied to the y qubit, which is the controlled Hadamard operation.

Let's look at classical control flow...