Quantum computing simulation using Q# with C#

This post shows you a Quantum computing sample that works using Visual Studio 2019 version 16.6.2. First download and install the Microsoft Quantum Development Kit, https://docs.microsoft.com/en-us/quantum/install-guide/standalone#installation, is in preview.

Download the code here https://github.com/microsoft/Quantum/tree/master/samples/interoperability/dotnet.. Open dotnet.sln. The solution is actually easier than the Bernstein–Vazirani algorithm, and is more classical than quantum. Indeed, the expression for the function 𝐹 can be simplified as follows: 𝐹(𝑥₀, …, 𝑥ₙ₋₁) = 2 Σᵢ 𝑟ᵢ 𝑥ᵢ + Σᵢ 𝑟ᵢ + Σᵢ 𝑥ᵢ + 𝑛 (mod 2) = Σᵢ 𝑟ᵢ + Σᵢ 𝑥ᵢ + 𝑛 (mod 2).

The C# code here:

static async Task Main(string[] args)


    var bits = new[] { false, true, false };

    using var sim = new QuantumSimulator();

    Console.WriteLine($”Input: {bits.ToDelimitedString()});

    var restored = await RunAlgorithm.Run(sim, new QArray<bool>(bits));

    Console.WriteLine($”Output: {restored.ToDelimitedString()});

    Assert(bits.Parity() == restored.Parity());


static bool Parity(this IEnumerable<bool> bitVector) =>


     (acc, next) => acc ^ next


static string ToDelimitedString(this IEnumerable<bool> values) =>

    String.Join(“, “, values.Select(x => x.ToString()));


is calling the Q# code below.

operation ApplyProductWithNegationFunction (vector : Bool[], controls : Qubit[], target : Qubit)

: Unit is Adj {

    for ((bit, control) in Zip(vector, controls)) {

            (ControlledOnInt(bit ? 1 | 0, X))([control], target);



operation ReconstructOracleParameters(N : Int, oracle : ((Qubit[], Qubit) => Unit)) : Bool[] {

    using ((x, y) = (Qubit[N], Qubit())) {

        oracle(x, y);

            if (N % 2 == 1) {



            let m = MResetZ(y);


            return m == One

             ? ConstantArray(N, false) w/ 0 <- true

             | ConstantArray(N, false);



operation RunAlgorithm(bits : Bool[]) : Bool[] {

    Message(“Hello, quantum world!”);

    let oracle = ApplyProductWithNegationFunction(bits, _, _);

    return ReconstructOracleParameters(Length(bits), oracle);


About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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