QuantumMatter.Core 1.2.0

QuantumMatter SDK

QuantumMatter is an MIT-licensed quantum simulator built from scratch in C# using double-precision System.Numerics.Complex. Libraries target .NET 9; package-only consumer checks also run on .NET 10. Starting with v1.1, the full xUnit suite runs on both runtimes using the same net9.0 library assets.

Install Application and Infrastructure at the same version; Core is transitive.

dotnet add package QuantumMatter.Application
dotnet add package QuantumMatter.Infrastructure

These commands select the latest stable version. For a local/prerelease candidate, specify its version and feed. See the repository release record for publication status and validation evidence.

using QuantumMatter.Application;
using QuantumMatter.Core;
using QuantumMatter.Infrastructure;

var circuit = new QuantumCircuit(2).H(0).CNot(0, 1);
var simulator = new StateVectorSimulator(new CpuStateVectorBackend());
var result = simulator.Run(circuit, shots: 1000, seed: 42);
foreach (var (bits, count) in result.Counts)
    Console.WriteLine($"{bits}: {count}");

Qubit zero is the least significant bit; printed kets show the highest bit first. Angles are radians, gates act on column vectors in insertion order, and phases are retained. Memory budgets apply before allocating state/estimator arrays.

CPU execution needs no GPU driver. CUDA is explicitly selected with CudaStateVectorBackend and requires a compatible NVIDIA driver/device; dispose the backend after use. v1.0 CUDA support is validated on Windows x64; Linux CUDA is experimental. SIMD is opt-in. Noise uses a separate trajectory API and CPU channel kernels; it is not represented by one final ensemble ket.

Version 1.2 adds partial-register measurement, normalized marginals and Pauli-string expectations on host states; see docs/observations.md. These preserve the existing unitary circuit and terminal sampling contracts.

The package contains XML IntelliSense documentation, declared public API files, LICENSE, CHANGELOG.md, third-party notices, and the docs directory. Start with docs/api/1.2.0.md, docs/compatibility.md, docs/noise.md and docs/gpu-execution.md. See the repository for validated hardware, raw benchmarks, known limitations and the release checklist and repository.