0 Temporal Ordering in Quantum Mechanics
نویسندگان
چکیده
We examine the measurability of the temporal ordering of two events, as well as event coincidences. In classical mechanics, a measurement of the order-of-arrival of two particles is shown to be equivalent to a measurement involving only one particle (in higher dimensions). In quantum mechanics, we find that diffraction effects introduce a minimum inaccuracy to which the temporal order-of-arrival can be determined unambiguously. The minimum inaccuracy of the measurement is given by δt = ¯ h/ ¯ E where ¯ E is the total kinetic energy of the two particles. Similar restrictions apply to the case of coincidence measurements.
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