Tradeoff between Wigner negativity and decoherence time for cubic Gaussian states
A new arXiv study analyses cubic Gaussian states, formed by applying a cubic operation to Gaussian states, as a way to generate Wigner negativity for quantum computation. It reports that larger Wigner negativity in these states comes with a shorter decoherence time, revealing a tradeoff between the quantum resource and how long it survives.
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What this could mean
- 0–2 yearsPlausible
Experimental continuous-variable photonics teams could use the reported tradeoff to bound how much cubic non-Gaussianity is worth injecting before decoherence cancels the benefit, guiding gate-strength choices in nearer-term hardware.
Photonic platforms pursuing continuous-variable quantum computing already implement cubic-phase gates, and the paper provides a quantitative relationship between Wigner negativity and decoherence. If the model holds under realistic loss models, it gives a direct calibration target for experiments.
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