Abstract
In this paper, Unruh-DeWitt type particle detector is reformed to detectors with instant response. After this reformation, all ideal particle detectors become equivalent, although they respond differently to different quantum state. This kind of detectors are designed to detect the quantity 2>, just as Davies desired. Furthermore, a useful method for calculating the instant response function for a detector with monopole coupling and moving arbitrarily in a Minkowski vacuum is presented.
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