Long-Time Correlations in Single-Neutron Interferometry Data

Journal of the Physical Society of Japan, vol. 89, pp. 064005

Abstract

We present a detailed analysis of the time series of time-stamped neutron counts obtained by single-neutron interferometry.The neutron counting statistics display the usual Poissonian behavior, but the variance of the neutron counts does not.Instead, the variance is found to exhibit a dependence on the phase-shifter setting which can be explained by a probabilistic model that accounts for fluctuations of the phase shift.The time series of the detection events exhibit long-time correlations with amplitudes that also depend on the phase-shifter setting.These correlations appear as damped oscillations with a period of about 2.8 s.By simulation, we show that the correlations of the time differences observed in the experiment can be reproduced by assuming that, for a fixed setting of the phase shifter, the phase shift experienced by the neutrons varies periodically in time with a period of 2.8 s.The same simulations also reproduce the behavior of the variance.Our analysis of the experimental data suggests that time-stamped data of singleparticle interference experiments may exhibit transient features that require a description in terms of non-stationary processes, going beyond the standard quantum model of independent random events.

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