QA² Labs

News and dispatches.

Research notes, product updates, and dispatches from the lab.

New in the client: Amazon Braket and OpenQASM 3.0 Adapters

The latest client update adds native support for Amazon Braket circuits and OpenQASM 3.0 programs. Both adapters run entirely offline with no account or cloud connection required. Circuits pass directly into the classifier without rewriting or intermediate transpilation.

The Braket adapter accepts any braket.circuits.Circuit object. The OpenQASM adapter parses QASM 3.0 source strings and reconstructs the circuit graph before analysis. Both are included in the Apache 2.0 free client. The licensed engine adds structural verdict support for both circuit types.

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Research Dispatch: Spectral Stability in Non-Hermitian Open Quantum Systems

A new dispatch from the research program examines spectral stability conditions for non-Hermitian Hamiltonians arising in coupled qubit environments with environmental dissipation. The central question: under what conditions does a small perturbation to the system-environment coupling shift a spectral eigenvalue across the real axis, and what does that transition imply for decoherence timescales?

The analysis works from the operator-algebraic structure up, with equilibrium conditions derived rather than assumed. Findings from this line of inquiry go through internal verification before anything is characterized publicly; further detail is available on request.

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The Attribution Gap: Why Error Mitigation Needs a Prior Step

Zero-noise extrapolation and probabilistic error cancellation are source-agnostic: they attempt to invert the noise channel regardless of whether the error comes from hardware or from a bug in the circuit. If a software bug is present, both methods will extrapolate the wrong result to the zero-noise limit. The extrapolated answer is wrong not because the technique failed, but because it was applied to the wrong problem.

This note documents the attribution gap: the absence, in current quantum tooling, of a prior step that determines the error source before mitigation begins. Published literature identifies the gap directly: Virani et al. (arXiv:2507.20475) propose a statistical method to distinguish software bugs from hardware noise, and Hassan and Kaabouch (arXiv:2602.21253) present a physics-informed diagnostic framework, validated on IBM's 156-qubit Heron processor, that flags logically flawed circuits before mitigation is applied (see also Di Matteo, arXiv:2402.09547, on the broader need for quantum debugging tools). No tool integrated into the Qiskit, Cirq, or TKET production pipelines performs this check today.

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