Drastically suppressing the error of ballistic readout of qubits

The thermal jitter of transmission of magnetic flux quanta in long Josephson junctions is studied. While for large-to-critical damping and small values of bias current the physically obvious dependence of the jitter versus length $σ\sim\sqrt{L}$ is confirmed, for small damping starting from the experimentally relevant $α=0.03$ and below strong deviation from $σ\sim\sqrt{L}$ is observed, up to nearly complete independence of the jitter versus length, which is exciting from fundamental point of view, but also intriguing from the point of view of possible applications.

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