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Such subtleties appear also in the definition of fractional charge. There is no fundamental particle with a fractional charge; the fractional charge is the difference between the net charge in a large enough area with or without a CFQP in it. In other words, it is also an order-1 difference between two large numbers. Will quantum fluctuations in the net charge, which are large compared to unity for a large area, make the definition of a fractional charge conceptually meaningless? Here, a possible way out (Ref. 29) is to consider an area enclosing the CFQP which is small enough that the fluctuations are small compared to the difference. Any experiment seeking to measure the fractional charge must consider such issues carefully.
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