Hybrid Schrodinger Feynman Simulator reports error for circuits with SWAP gates

[tyi1025]

mqt.ddsim version

0.1.dev387+g328fdec

OS

macOS Monterey

Python version

No response

C++ compiler

gcc 13.1.6

Additional environment information

No response

Description

The HybridSchrodingerFeynmanSimulator seems to fail when there is a SWAP gate present. It gives Assertion failed: (targets.size() == 2), function getDD, file Operations.hpp, line 240. The error disappears as long as you remove the SWAP line.

Expected behavior

The simulation results should be returned

How to Reproduce

    qc->x(0);
    qc->swap(0, 1);
    auto hybridSimulator = std::make_unique<HybridSchrodingerFeynmanSimulator<>>(
        std::move(qc), ApproximationInfo{}, 23);
    auto result = hybridSimulator->simulate(1024U);

[hillmich]

Thank you for creating the issue! From the top of my head, I would guess that the splitting the circuit between two targets is not supported in the decomposition. I'll have a look.