Beautiful and compact Web APIs with C# 9, .NET 5.0 and ASP.NET Core

Almost fours year ago I blogged about building lightweight microservices with ASP.NET Core 1.2 (which actually never shipped in such version and later became ASP.NET Core 2.0). The idea there was to drop the notion of bloated MVC controllers, get rid of as much as we can of the usual verbosity of C# based applications, and use a set of simple extension methods and a few cutting edge features of ASP.NET Core to provide a node.js style experience for authoring Web APIs.

The article and the accompanying demo projects received quite a lot of attention, and I even got a chance to speak at some conference about these type of approaches to building focused, small microservices. With the .NET 5.0 in sight (.NET 5.0 RC2 is out at the time of writing this), and some remarkable features of C# 9, this “lightweight Web APIs” concept deserves a revisit, and this is what we will do in this blog post.

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Introduction to quantum computing with Q# – Part 9, BB84 Quantum Key Distribution

This is already part 9 of the series (time flies!). So far we have covered a wide array of topic around the nature of quantum computational units called qubits, superposition, entanglement, single-qubit gates, multi-qubit gates and some interesting concepts from the area of quantum information theory. In this post we will shift our attention to another interesting field in the quantum landscape – quantum cryptography. More specifically, we will explore a reference protocol for quantum key distribution, called BB884, discuss why it’s secure even when using a public channel to exchange qubits and realize a simple demonstrative implementation using Q#.

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Introduction to quantum computing with Q# – Part 8, Superdense coding

Last time, we discussed the quantum teleportation protocol, which relies on the phenomenon of quantum entanglement to move an arbitrary quantum state from one qubit to another, even if they are spatially separated. Today, we shall continue exploring the scenarios enabled by entanglement, by looking at the concept called “superdense coding”. It allows sending two classical bits of information by physically moving only a single qubit around, and is sometimes referred to as a conceptual inverse of teleportation.

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Support for unimported types in Omnisharp and C# Extension for VS Code

Some time ago I blogged about new Omnisharp features – support for analyzers and support for Editorconfig. Those were at the time two of the most requested features on Github that we had. Today I wanted to let you know that we just shipped another one of those hugely requested functionalities – support for unimported types. In fact, since those previous two have been dealt with, this was the most requested feature that we had.

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Introduction to quantum computing with Q# – Part 7, Quantum state teleportation

In the previous part of the series we discussed how quantum theory prohibits copying of an arbitrary quantum state. In computing terms, this means that regardless of the richness of features provided by high-level quantum-specific languages such as Q#, we cannot implement a classical functionality of copy-and-paste on a quantum computer.

It turns out, however, that we can achieve a cut-and-paste type of effect, through a remarkable process of quantum teleportation.

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Introduction to quantum computing with Q# – Part 6, No-cloning theorem

In the last part of this series we looked at the phenomenon of entanglement – one of the core concepts of quantum theory, which has been fundamentally important in the development of quantum information theory. We grappled with its deeply mysterious behavior and tried to understand and project its consequences onto the Q# code.

In today’s part 6, we shall ask ourselves a seemingly innocent question – how to you clone a quantum state, or in other words, how do you copy a qubit?

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Running Q# compiler and simulation programmatically from a C# application

The QDK provides an excellent, low barrier way of getting started with Q# development – without having to deal with the compiler directly, or worrying about how to simulate the code you wrote on a classical device. Additionally, for more technically versed users, the Q# compiler is also available as a command line utility that can be used to fine tune the compilation experience and cater to complex scenarios. The QDK is well documented, and the command line compiler provides good documentation as part of the application itself, but one of the things that is not widely known is that the Q# compiler can also be easily used programmatically – via its Nuget package.

Let’s have a look.

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Introduction to quantum computing with Q# – Part 5, Entanglement

In the last post in this series we dove deep into the mathematics and usage examples of multi-qubit gates, with special attention paid to one of the most critical gates in quantum computing, the CNOT gate.

In today’s post we are going to explore the wonders of entanglement – a core concept of quantum mechanics and a critical idea for quantum computing, where it is obtained via the application of the CNOT gate.

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Introduction to quantum computing with Q# – Part 4, multi-qubit gates

In the previous post of this series, we discussed single qubit gates. In this next instalment, we are going to explore gates that act on multiple qubits at once, thus completing the exploration of quantum circuit building. We are also going to slowly, but diligently uncover the underlying theoretical scheme towards one of the most bizarre concepts in quantum mechanics – entanglement, which is something that will be dedicating the next part to.

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