coherence time的意思|示意

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Coherence time, which is also referred to as “characteristic life time” of a physical system, is a parameter that expresses characteristic behavior of a physical system. Generally speaking, it is the time during which a given physical system maintains its stability and remains coherent.

To explain the usage of coherence time, we can look at its application in the field of optics. In optical interferometry, two or more light beams or waves are combined to make a single wave. For this wave to remain stable, the coherence time must be greater than the time it takes for the wave to travel from one beam to the other. If the coherence time is shorter than the time it takes for the wave to travel from one beam to the other, the wave will become unstable, and the interference pattern will be distorted.

In addition to its usage in optics, coherence time can also be used in the context of atomic physics. In this field, it is used to describe the time it takes for an atom to remain in a single quantum state before it transitions to another state. This measure is typically used to evaluate the stability of atomic systems and is an important parameter in understanding their behavior.

In summary, coherence time expresses the characteristic behavior of a physical system and is an important parameter in the fields of optics and atomic physics. It describes the time a system remains stable and coherent before transitioning to another state.