If you’re new to quantum computing, start with A Beginner’s Guide to Quantum Computing.
Step 1. Install Visual Studio 2017
To build quantum computing applications, you will need the latest version of Visual Studio 2017 (15.6 or later).
Download Visual Studio 2017 Community edition from here: https://www.visualstudio.com/downloads/
Step 2. Install Microsoft Quantum Development Kit
Visit Microsoft’s Quantum Computing home page here:
Click on "Download Now" button.On the next page, fill out the details and click on "Download Now".
Download Quantum Development Kit and installed it. Once the installation is completed, you should see the following Figure 2.
Step 3. Create Q# Project
Now, let’s create our first Q# application.
Open Visual Studio 2017 Community and go to File > New Project > Visual C#. We see three Q# project templates – Q# Application, Q# Library, and Q# Test Project.
Select Q# Application project template, type your project name and click OK. See Figure 3.
Let’s write some Q# code that will do something. For the simplicity sake, I’ll create a simple operation in Q# that adds two integers and returns the total of the two.
Open Operation.qs and replace the code with Listing 3.
Next, we write an operation. The basic unit of quantum execution is an operation. It is equivalent to a C/C++ function or a static method in C# or Java. The code snippet in Listing 4 is an operation.
The operation Add declared in Listing 4 takes two arguments of int type and returns the sum of the two values. Each operation has a body section that contains the implementation of the operation.
Step 5. Execute a Q# Operation
The Main method of the Driver class is the gateway to the program that executes Q# code. Since there is no real quantum computer on my laptop, the way to execute a Q# program is using a quantum simulator. The quantum simulator is installed as a part of the QDK.
The QuantumSimulator class defined in the Microsoft.Quantum.Simulation.Simulators
namespace represents a simulator. The following code snippet creates a quantum simulator.
using (var sim = new QuantumSimulator())
An operation is executed by using a call operation.Run(simulator, arguments). The following code snippet executes the Add operation.
var res = Add.Run(sim, 20, 10).Result;
The complete code of Driver class is listed in Listing 4. The code calls the Add operation by passing a simulator, two arguments of integer type, and the results are returned in a var.
If you build the project, you will get a bunch of errors. To fix that, you need to target a specific framework and platform.
Right click on project name in Solution Explorer and click on Properties. On Application settings, change Target framework to 4.6.1 and on Build settings, change Platform target from Any CPU to x64. See Figure 5.
Q# is the newest programming language introduced by Microsoft to write a quantum computing based application. In this article, you learned how to install Quantum Development Kit, setup up Visual Studio 2017 for a Q# project, write our first Q# code, and build and execute it.
If you’re new to quantum computing, I recommend reading A Beginner’s Guide to Quantum Computing. Learn more Q# Programming here >