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A graphical presentation of the timing of avalanche photodiode events in thedatasets from the experiment of Weihs et al. [Phys. Rev. Lett. 81, 5039 (1998)]makes manifest the existence of two types of signal delay: (1) The introductionof rapid switching of the input to a pair of transverse electro-opticalmodulators causes a delay of approximately 20 nanoseconds for a proportion ofcoincident avalanche photodiode events; this effect has been previously noted,but a different cause is suggested by the data as considered here. (2) Thereare delays that depend on in which avalanche photodiode an event occurs; thiseffect has also been previously noted even though it is only strongly apparentwhen the relative time difference between avalanche photodiode events is nearthe stated 0.5 nanosecond accuracy of the timestamps (but it is identifiablebecause of 75 picosecond resolution). The cause of the second effect is adifference between signal delays for the four avalanche photodiodes, for whichcorrection can be made by straightforward local adjustments (with almost noeffect on the degree of violation of Bell-CHSH inequalities).

A graphical presentation of signal delays in the datasets of Weihs et al