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Current crowding in the bends of superconducting nano-structures not onlyrestricts measurable critical current in such structures but also redistributeslocal probabilities for dark and light counts to appear. Using structures fromstrips in the form of a square spiral which contain bends with the very samecurvature with respect to the directions of bias current and external magneticfield, we have shown that dark counts as well as light counts at small photonenergies originate from areas around the bends. The minimum in the rate of darkcounts reproduces the asymmetry of the maximum critical current density asfunction of the magnetic field. Contrary, the minimum in the rate of lightcounts demonstrate opposite asymmetry. The rate of light counts becomesymmetric at large currents and fields. Comparing locally computed absorptionprobabilities for photons and the simulated threshold detection current wefound the approximate locations of areas near bends which deliver asymmetriclight counts. Any asymmetry is absent in Archimedean spiral structures withoutbends.

Asymmetry in the effect of magnetic field on photon detection and dark counts in bended nanostrips