What does this research mean for the field?

Direct measurement of superconducting qubits without fitting reveals that energy relaxation admits a positive classical rate density while pure dephasing does not, and demonstrates that a local unitary operation can revert the decoherence arrow. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

Apply Pollard's criterion directly to decay curves without curve-fitting to assess complete monotonicity and classical rate densities in superconducting qubit relaxation and dephasing channels.

September 3, 2026Open Access

One Qubit, Two Verdicts: Pure Dephasing With No Classical Rate Density, Energy Relaxation With One — Complete Monotonicity Measured Without Fitting on Superconducting Hardware; Two Predictions Refutable Against Existing Literature; and a Self-Audit of the Framework That Produced Them

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Authors

EDEloy René Becerra Daly

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Implication

Experimental study demonstrates non-classical rate density in pure dephasing but not energy relaxation in superconducting qubits, suggesting distinct decoherence channels.

Key Points

Apply Pollard's criterion directly to decay curves without curve-fitting to assess complete monotonicity and classical rate densities in superconducting qubit relaxation and dephasing channels.
Evaluated 20 non-adjacent qubits on a single superconducting device across 39 circuits and 958,452 shots.
Applied non-negative least squares across 200 free decay rates to test classical rate density compatibility without parametric fitting.
Benchmarked pure dephasing against energy relaxation (T1) controls using echo curves, a one-rate Lindblad model, and the Breuer–Laine–Piilo non-Markovianity witness.
Energy relaxation admitted a positive classical rate density with χ²/dof = 0.99, compatible across 19 of 20 replicates.
Pure dephasing rejected classical rate density models with χ²/dof = 12.43 (refuted in 17 of 20 replicates), displaying significant echo revivals in 10 of 220 segments (>3σ, peak z = +11.01) across 7 qubits.
The conventional two-parameter Kohlrausch form was rejected in dephasing arms (χ²/dof = 11.49 and 1598), and T1 returned β = 0.8664 ± 0.0285 rather than the expected single-rate value of 1.

Cite This Study

Eloy René Becerra Daly (2026) studied this question.

synapsesocial.com/papers/6a9935d8636c6408cfa7e64d https://doi.org/10.5281/zenodo.22238971

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Implication

Experimental study demonstrates non-classical rate density in pure dephasing but not energy relaxation in superconducting qubits, suggesting distinct decoherence channels.

One Qubit, Two Verdicts: Pure Dephasing With No Classical Rate Density, Energy Relaxation With One — Complete Monotonicity Measured Without Fitting on Superconducting Hardware; Two Predictions Refutable Against Existing Literature; and a Self-Audit of the Framework That Produced Them

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Cite This Study

One Qubit, Two Verdicts: Pure Dephasing With No Classical Rate Density, Energy Relaxation With One — Complete Monotonicity Measured Without Fitting on Superconducting Hardware; Two Predictions Refutable Against Existing Literature; and a Self-Audit of the Framework That Produced Them

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