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اگر سد پتانسیل داشته باشیم داشته باشیم در وضعیتی که انرژی مکانیکی کمتر از پتانسیل است طبق فیزیک کلاسیک نباید الکترونی بگذرد اما طبق فیزیک کوانتوم با احتمالی برخی الکترون ها می گذرند و برخی (بیشترشان) بر میگردند حال اگر سد دیگری با همین شرایط بعد الکترون های عبوری بگذاریم همگی بر می گردند یا برخی شانسی عبور می کنند و برخی بر می گردند؟

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