Quantum

Witnessing and quantifying stellar rank with the Wigner function

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 02/11/2026, 05:13:25 UTC.

Briefings

A new framework quantifies non-Gaussianity using displaced parity measurements and the stellar rank, applied to superconducting cavity data. The study certifies non-Gaussian resources and establishes a stellar rank of 8 for a GKP state, setting a new benchmark across quantum platforms. Methods include refined witnesses based on Wigner function values at specific points, offering efficient certification tools superior to existing alternatives.

Key points

• The study introduces a framework to witness and quantify non-Gaussianity using displaced parity measurements and the stellar rank.
• A stellar rank of 8 was established for a GKP state, representing a new benchmark across all quantum platforms.

Context

Quantifying non-Gaussianity is essential for assessing the computational power of bosonic quantum systems. This research applies these techniques to experimental data from superconducting cavities, enabling certification of non-Gaussian resources directly applicable to superconducting devices.

Limitations

The evidence is limited to a single preprint (arXiv:2610.40827v1) with no peer-reviewed validation. Results are based on simulated or preliminary experimental data rather than fully verified physical measurements. Specific parameters and calibration details are not provided.

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