%0 Journal Article
%A Willsch, Madita
%A Willsch, Dennis
%A Michielsen, Kristel
%A Jin, Fengping
%A Denkmayr, Tobias
%A Sponar, Stephan
%A Hasegawa, Yuji
%A De Raedt, Hans
%T Long-Time Correlations in Single-Neutron Interferometry Data
%J Journal of the Physical Society of Japan
%V 89
%N 6
%@ 1347-4073
%C Tokyo
%I The Physical Society of Japan
%M FZJ-2020-02170
%P 064005 -
%D 2020
%X 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 single-particle 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000537748100011
%R 10.7566/JPSJ.89.064005
%U https://juser.fz-juelich.de/record/877400